128 lines
3.4 KiB
C#
128 lines
3.4 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="Substitution.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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namespace System.Web.UI.WebControls {
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using System;
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using System.ComponentModel;
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using System.Globalization;
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using System.Security.Permissions;
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using System.Web;
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using System.Web.UI;
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/// <devdoc>
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/// <para></para>
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/// </devdoc>
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[
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DefaultProperty("MethodName"),
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Designer("System.Web.UI.Design.WebControls.SubstitutionDesigner, " + AssemblyRef.SystemDesign),
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ParseChildren(true),
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PersistChildren(false),
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]
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public class Substitution : Control {
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/// <devdoc>
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/// <para></para>
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/// </devdoc>
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public Substitution() {
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}
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/// <devdoc>
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/// <para></para>
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/// </devdoc>
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[
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DefaultValue(""),
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WebCategory("Behavior"),
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WebSysDescription(SR.Substitution_MethodNameDescr)
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]
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public virtual string MethodName {
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get {
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string s = ViewState["MethodName"] as string;
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return s == null? String.Empty : s;
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}
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set {
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ViewState["MethodName"] = value;
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}
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}
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protected override ControlCollection CreateControlCollection() {
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return new EmptyControlCollection(this);
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}
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// SECURITY CODE
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// VSWhidbey 253188: Permission assert to support page running below full trust
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[ReflectionPermission(SecurityAction.Assert, Flags=ReflectionPermissionFlag.MemberAccess)]
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private HttpResponseSubstitutionCallback GetDelegate(Type targetType, string methodName) {
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return (HttpResponseSubstitutionCallback)Delegate.CreateDelegate(
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typeof(HttpResponseSubstitutionCallback), targetType, methodName);
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}
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protected internal override void OnPreRender(EventArgs e) {
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base.OnPreRender(e);
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// VSWhidbey 84748: Temp fix, throw if we are within a cached control
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Control parent = Parent;
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while (parent != null) {
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if (parent is BasePartialCachingControl) {
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throw new HttpException(
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SR.GetString(SR.Substitution_CannotBeInCachedControl));
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}
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parent = parent.Parent;
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}
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}
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protected internal override void Render(HtmlTextWriter writer) {
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RenderMarkup(writer);
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}
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internal void RenderMarkup(HtmlTextWriter writer) {
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if (MethodName.Length == 0) {
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return;
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}
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TemplateControl target = TemplateControl;
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if (target == null) {
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return;
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}
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// get the delegate to the method
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HttpResponseSubstitutionCallback callback = null;
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try {
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callback = GetDelegate(target.GetType(), MethodName);
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}
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catch {
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}
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if (callback == null) {
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throw new HttpException(
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SR.GetString(SR.Substitution_BadMethodName, MethodName));
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}
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// add the substitution to the response
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Page.Response.WriteSubstitution(callback);
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}
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}
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}
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