81 lines
3.2 KiB
C#
81 lines
3.2 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="CallbackValidatorAttribute.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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using System;
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using System.Configuration.Internal;
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using System.Collections;
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using System.Collections.Specialized;
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using System.Collections.Generic;
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using System.IO;
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using System.Reflection;
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using System.Security.Permissions;
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using System.Xml;
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using System.Globalization;
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using System.ComponentModel;
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using System.Security;
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using System.Text;
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namespace System.Configuration {
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[AttributeUsage(AttributeTargets.Property)]
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public sealed class CallbackValidatorAttribute : ConfigurationValidatorAttribute {
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private Type _type = null;
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private String _callbackMethodName = String.Empty;
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private ValidatorCallback _callbackMethod;
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public override ConfigurationValidatorBase ValidatorInstance {
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get {
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if (_callbackMethod == null) {
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if (_type == null) {
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throw new ArgumentNullException("Type");
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}
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if (!String.IsNullOrEmpty(_callbackMethodName)) {
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MethodInfo methodInfo = _type.GetMethod(_callbackMethodName, BindingFlags.Public | BindingFlags.Static);
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if (methodInfo != null) {
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ParameterInfo[] parameters = methodInfo.GetParameters();
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if ((parameters.Length == 1) && (parameters[0].ParameterType == typeof(Object))) {
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// The security here depends on nobody changing the type or callback method once the declaring type has been
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// set. This currently isn't an issue since the attribute is instantiated then the declaring type is set without
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// user code having gotten a chance to run in between. But if the behavior of PropertyInfo.GetAttributes ever
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// changes such that it returns cached attribute instances rather than new instances every time, this assumption is void.
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_callbackMethod = (ValidatorCallback)TypeUtil.CreateDelegateRestricted(_declaringType, typeof(ValidatorCallback), methodInfo);
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}
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}
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}
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}
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if (_callbackMethod == null) {
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throw new System.ArgumentException(SR.GetString(SR.Validator_method_not_found, _callbackMethodName));
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}
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return new CallbackValidator(_callbackMethod);
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}
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}
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public CallbackValidatorAttribute() {
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}
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public Type Type {
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get {
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return _type;
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}
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set {
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_type = value;
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_callbackMethod = null;
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}
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}
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public String CallbackMethodName {
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get {
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return _callbackMethodName;
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}
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set {
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_callbackMethodName = value;
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_callbackMethod = null;
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}
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}
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}
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}
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