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