447 lines
19 KiB
C#
447 lines
19 KiB
C#
/* ****************************************************************************
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*
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* Copyright (c) Microsoft Corporation.
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*
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* This source code is subject to terms and conditions of the Microsoft Public License. A
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* copy of the license can be found in the License.html file at the root of this distribution. If
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* you cannot locate the Microsoft Public License, please send an email to
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* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
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* by the terms of the Microsoft Public License.
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*
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* You must not remove this notice, or any other, from this software.
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*
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*
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* ***************************************************************************/
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using System; using Microsoft;
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#if !SILVERLIGHT
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using System.Collections.Generic;
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using System.Diagnostics.CodeAnalysis;
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#if CODEPLEX_40
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using System.Linq.Expressions;
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#else
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using Microsoft.Linq.Expressions;
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#endif
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using System.Security;
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using System.Security.Permissions;
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#if CODEPLEX_40
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[assembly: SuppressMessage("Microsoft.Design", "CA1020:AvoidNamespacesWithFewTypes", Scope = "namespace", Target = "System.Dynamic")]
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#else
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[assembly: SuppressMessage("Microsoft.Design", "CA1020:AvoidNamespacesWithFewTypes", Scope = "namespace", Target = "Microsoft.Scripting")]
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#endif
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#if CODEPLEX_40
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namespace System.Dynamic {
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#else
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namespace Microsoft.Scripting {
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#endif
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/// <summary>
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/// Provides helper methods to bind COM objects dynamically.
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/// </summary>
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#if MICROSOFT_DYNAMIC
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public
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#else
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internal
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#endif
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static class ComBinder {
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/// <summary>
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/// Determines if an object is a COM object.
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/// </summary>
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/// <param name="value">The object to test.</param>
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/// <returns>true if the object is a COM object, false otherwise.</returns>
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public static bool IsComObject(object value) {
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return ComObject.IsComObject(value);
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}
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/// <summary>
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/// Tries to perform binding of the dynamic get member operation.
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/// </summary>
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/// <param name="binder">An instance of the <see cref="GetMemberBinder"/> that represents the details of the dynamic operation.</param>
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/// <param name="instance">The target of the dynamic operation. </param>
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/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
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/// <param name="delayInvocation">true if member evaluation may be delayed.</param>
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/// <returns>true if operation was bound successfully; otherwise, false.</returns>
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#if CLR2
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[SecurityCritical, SecurityTreatAsSafe]
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#else
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[SecuritySafeCritical]
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#endif
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public static bool TryBindGetMember(GetMemberBinder binder, DynamicMetaObject instance, out DynamicMetaObject result, bool delayInvocation) {
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ContractUtils.RequiresNotNull(binder, "binder");
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ContractUtils.RequiresNotNull(instance, "instance");
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if (TryGetMetaObject(ref instance)) {
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//
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// Demand Full Trust to proceed with the binding.
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//
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new PermissionSet(PermissionState.Unrestricted).Demand();
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var comGetMember = new ComGetMemberBinder(binder, delayInvocation);
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result = instance.BindGetMember(comGetMember);
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if (result.Expression.Type.IsValueType) {
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result = new DynamicMetaObject(
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Expression.Convert(result.Expression, typeof(object)),
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result.Restrictions
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);
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}
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return true;
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} else {
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result = null;
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return false;
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}
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}
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/// <summary>
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/// Tries to perform binding of the dynamic get member operation.
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/// </summary>
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/// <param name="binder">An instance of the <see cref="GetMemberBinder"/> that represents the details of the dynamic operation.</param>
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/// <param name="instance">The target of the dynamic operation. </param>
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/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
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/// <returns>true if operation was bound successfully; otherwise, false.</returns>
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public static bool TryBindGetMember(GetMemberBinder binder, DynamicMetaObject instance, out DynamicMetaObject result) {
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return TryBindGetMember(binder, instance, out result, false);
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}
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/// <summary>
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/// Tries to perform binding of the dynamic set member operation.
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/// </summary>
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/// <param name="binder">An instance of the <see cref="SetMemberBinder"/> that represents the details of the dynamic operation.</param>
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/// <param name="instance">The target of the dynamic operation.</param>
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/// <param name="value">The <see cref="DynamicMetaObject"/> representing the value for the set member operation.</param>
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/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
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/// <returns>true if operation was bound successfully; otherwise, false.</returns>
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#if CLR2
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[SecurityCritical, SecurityTreatAsSafe]
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#else
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[SecuritySafeCritical]
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#endif
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public static bool TryBindSetMember(SetMemberBinder binder, DynamicMetaObject instance, DynamicMetaObject value, out DynamicMetaObject result) {
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ContractUtils.RequiresNotNull(binder, "binder");
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ContractUtils.RequiresNotNull(instance, "instance");
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ContractUtils.RequiresNotNull(value, "value");
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if (TryGetMetaObject(ref instance)) {
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//
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// Demand Full Trust to proceed with the binding.
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//
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new PermissionSet(PermissionState.Unrestricted).Demand();
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result = instance.BindSetMember(binder, value);
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return true;
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} else {
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result = null;
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return false;
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}
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}
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/// <summary>
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/// Tries to perform binding of the dynamic invoke operation.
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/// </summary>
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/// <param name="binder">An instance of the <see cref="InvokeBinder"/> that represents the details of the dynamic operation.</param>
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/// <param name="instance">The target of the dynamic operation. </param>
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/// <param name="args">An array of <see cref="DynamicMetaObject"/> instances - arguments to the invoke member operation.</param>
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/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
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/// <returns>true if operation was bound successfully; otherwise, false.</returns>
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#if CLR2
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[SecurityCritical, SecurityTreatAsSafe]
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#else
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[SecuritySafeCritical]
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#endif
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public static bool TryBindInvoke(InvokeBinder binder, DynamicMetaObject instance, DynamicMetaObject[] args, out DynamicMetaObject result) {
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ContractUtils.RequiresNotNull(binder, "binder");
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ContractUtils.RequiresNotNull(instance, "instance");
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ContractUtils.RequiresNotNull(args, "args");
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if (TryGetMetaObject(ref instance)) {
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//
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// Demand Full Trust to proceed with the binding.
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//
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new PermissionSet(PermissionState.Unrestricted).Demand();
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result = instance.BindInvoke(binder, args);
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return true;
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} else {
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result = null;
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return false;
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}
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}
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/// <summary>
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/// Tries to perform binding of the dynamic invoke member operation.
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/// </summary>
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/// <param name="binder">An instance of the <see cref="InvokeMemberBinder"/> that represents the details of the dynamic operation.</param>
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/// <param name="instance">The target of the dynamic operation. </param>
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/// <param name="args">An array of <see cref="DynamicMetaObject"/> instances - arguments to the invoke member operation.</param>
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/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
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/// <returns>true if operation was bound successfully; otherwise, false.</returns>
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#if CLR2
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[SecurityCritical, SecurityTreatAsSafe]
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#else
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[SecuritySafeCritical]
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#endif
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public static bool TryBindInvokeMember(InvokeMemberBinder binder, DynamicMetaObject instance, DynamicMetaObject[] args, out DynamicMetaObject result) {
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ContractUtils.RequiresNotNull(binder, "binder");
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ContractUtils.RequiresNotNull(instance, "instance");
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ContractUtils.RequiresNotNull(args, "args");
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if (TryGetMetaObject(ref instance)) {
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//
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// Demand Full Trust to proceed with the binding.
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//
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new PermissionSet(PermissionState.Unrestricted).Demand();
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result = instance.BindInvokeMember(binder, args);
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return true;
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} else {
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result = null;
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return false;
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}
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}
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/// <summary>
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/// Tries to perform binding of the dynamic get index operation.
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/// </summary>
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/// <param name="binder">An instance of the <see cref="GetIndexBinder"/> that represents the details of the dynamic operation.</param>
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/// <param name="instance">The target of the dynamic operation. </param>
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/// <param name="args">An array of <see cref="DynamicMetaObject"/> instances - arguments to the invoke member operation.</param>
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/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
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/// <returns>true if operation was bound successfully; otherwise, false.</returns>
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#if CLR2
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[SecurityCritical, SecurityTreatAsSafe]
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#else
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[SecuritySafeCritical]
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#endif
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public static bool TryBindGetIndex(GetIndexBinder binder, DynamicMetaObject instance, DynamicMetaObject[] args, out DynamicMetaObject result) {
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ContractUtils.RequiresNotNull(binder, "binder");
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ContractUtils.RequiresNotNull(instance, "instance");
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ContractUtils.RequiresNotNull(args, "args");
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if (TryGetMetaObject(ref instance)) {
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//
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// Demand Full Trust to proceed with the binding.
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//
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new PermissionSet(PermissionState.Unrestricted).Demand();
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result = instance.BindGetIndex(binder, args);
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return true;
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} else {
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result = null;
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return false;
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}
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}
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/// <summary>
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/// Tries to perform binding of the dynamic set index operation.
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/// </summary>
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/// <param name="binder">An instance of the <see cref="SetIndexBinder"/> that represents the details of the dynamic operation.</param>
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/// <param name="instance">The target of the dynamic operation. </param>
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/// <param name="args">An array of <see cref="DynamicMetaObject"/> instances - arguments to the invoke member operation.</param>
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/// <param name="value">The <see cref="DynamicMetaObject"/> representing the value for the set index operation.</param>
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/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
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/// <returns>true if operation was bound successfully; otherwise, false.</returns>
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#if CLR2
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[SecurityCritical, SecurityTreatAsSafe]
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#else
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[SecuritySafeCritical]
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#endif
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public static bool TryBindSetIndex(SetIndexBinder binder, DynamicMetaObject instance, DynamicMetaObject[] args, DynamicMetaObject value, out DynamicMetaObject result) {
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ContractUtils.RequiresNotNull(binder, "binder");
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ContractUtils.RequiresNotNull(instance, "instance");
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ContractUtils.RequiresNotNull(args, "args");
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ContractUtils.RequiresNotNull(value, "value");
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if (TryGetMetaObject(ref instance)) {
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//
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// Demand Full Trust to proceed with the binding.
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//
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new PermissionSet(PermissionState.Unrestricted).Demand();
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result = instance.BindSetIndex(binder, args, value);
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return true;
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} else {
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result = null;
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return false;
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}
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}
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/// <summary>
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/// Tries to perform binding of the dynamic Convert operation.
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/// </summary>
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/// <param name="binder">An instance of the <see cref="ConvertBinder"/> that represents the details of the dynamic operation.</param>
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/// <param name="instance">The target of the dynamic operation.</param>
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/// <param name="result">The new <see cref="DynamicMetaObject"/> representing the result of the binding.</param>
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/// <returns>true if operation was bound successfully; otherwise, false.</returns>
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#if CLR2
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[SecurityCritical, SecurityTreatAsSafe]
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#else
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[SecuritySafeCritical]
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#endif
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public static bool TryConvert(ConvertBinder binder, DynamicMetaObject instance, out DynamicMetaObject result) {
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ContractUtils.RequiresNotNull(binder, "binder");
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ContractUtils.RequiresNotNull(instance, "instance");
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if (IsComObject(instance.Value)) {
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//
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// Demand Full Trust to proceed with the binding.
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//
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new PermissionSet(PermissionState.Unrestricted).Demand();
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// Converting a COM object to any interface is always considered possible - it will result in
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// a QueryInterface at runtime
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if (binder.Type.IsInterface) {
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result = new DynamicMetaObject(
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Expression.Convert(
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instance.Expression,
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binder.Type
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),
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BindingRestrictions.GetExpressionRestriction(
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Expression.Call(
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typeof(ComObject).GetMethod("IsComObject", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic),
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Helpers.Convert(instance.Expression, typeof(object))
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)
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)
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);
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return true;
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}
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}
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result = null;
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return false;
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}
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/// <summary>
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/// Gets the member names associated with the object.
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/// This function can operate only with objects for which <see cref="IsComObject"/> returns true.
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/// </summary>
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/// <param name="value">The object for which member names are requested.</param>
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/// <returns>The collection of member names.</returns>
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#if CLR2
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[SecurityCritical, SecurityTreatAsSafe]
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#else
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[SecuritySafeCritical]
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#endif
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public static IEnumerable<string> GetDynamicMemberNames(object value) {
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ContractUtils.RequiresNotNull(value, "value");
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ContractUtils.Requires(IsComObject(value), "value", Strings.ComObjectExpected);
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//
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// Demand Full Trust to proceed with the binding.
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//
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new PermissionSet(PermissionState.Unrestricted).Demand();
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return ComObject.ObjectToComObject(value).GetMemberNames(false);
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}
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/// <summary>
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/// Gets the member names of the data-like members associated with the object.
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/// This function can operate only with objects for which <see cref="IsComObject"/> returns true.
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/// </summary>
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/// <param name="value">The object for which member names are requested.</param>
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/// <returns>The collection of member names.</returns>
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#if CLR2
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[SecurityCritical, SecurityTreatAsSafe]
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#else
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[SecuritySafeCritical]
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#endif
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[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
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internal static IList<string> GetDynamicDataMemberNames(object value) {
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ContractUtils.RequiresNotNull(value, "value");
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ContractUtils.Requires(IsComObject(value), "value", Strings.ComObjectExpected);
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//
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// Demand Full Trust to proceed with the binding.
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//
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new PermissionSet(PermissionState.Unrestricted).Demand();
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return ComObject.ObjectToComObject(value).GetMemberNames(true);
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}
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/// <summary>
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/// Gets the data-like members and associated data for an object.
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/// This function can operate only with objects for which <see cref="IsComObject"/> returns true.
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/// </summary>
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/// <param name="value">The object for which data members are requested.</param>
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/// <param name="names">The enumeration of names of data members for which to retrieve values.</param>
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/// <returns>The collection of pairs that represent data member's names and their data.</returns>
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[SuppressMessage("Microsoft.Design", "CA1006:DoNotNestGenericTypesInMemberSignatures")]
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[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
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#if CLR2
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[SecurityCritical, SecurityTreatAsSafe]
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#else
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[SecuritySafeCritical]
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#endif
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internal static IList<KeyValuePair<string, object>> GetDynamicDataMembers(object value, IEnumerable<string> names) {
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ContractUtils.RequiresNotNull(value, "value");
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ContractUtils.Requires(IsComObject(value), "value", Strings.ComObjectExpected);
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//
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// Demand Full Trust to proceed with the binding.
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//
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new PermissionSet(PermissionState.Unrestricted).Demand();
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return ComObject.ObjectToComObject(value).GetMembers(names);
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}
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private static bool TryGetMetaObject(ref DynamicMetaObject instance) {
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// If we're already a COM MO don't make a new one
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// (we do this to prevent recursion if we call Fallback from COM)
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if (instance is ComUnwrappedMetaObject) {
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return false;
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}
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if (IsComObject(instance.Value)) {
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instance = new ComMetaObject(instance.Expression, instance.Restrictions, instance.Value);
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return true;
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}
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return false;
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}
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/// <summary>
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/// Special binder that indicates special semantics for COM GetMember operation.
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/// </summary>
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internal class ComGetMemberBinder : GetMemberBinder {
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private readonly GetMemberBinder _originalBinder;
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internal bool _CanReturnCallables;
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internal ComGetMemberBinder(GetMemberBinder originalBinder, bool CanReturnCallables) :
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base(originalBinder.Name, originalBinder.IgnoreCase) {
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_originalBinder = originalBinder;
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_CanReturnCallables = CanReturnCallables;
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}
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public override DynamicMetaObject FallbackGetMember(DynamicMetaObject target, DynamicMetaObject errorSuggestion) {
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return _originalBinder.FallbackGetMember(target, errorSuggestion);
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}
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public override int GetHashCode() {
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return _originalBinder.GetHashCode() ^ (_CanReturnCallables ? 1 : 0);
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}
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public override bool Equals(object obj) {
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ComGetMemberBinder other = obj as ComGetMemberBinder;
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return other != null &&
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_CanReturnCallables == other._CanReturnCallables &&
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_originalBinder.Equals(other._originalBinder);
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}
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}
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}
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}
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#endif
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