99 lines
3.4 KiB
C#
99 lines
3.4 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="ControlValuePropertyAttribute.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 {
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using System;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.Security.Permissions;
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using System.Web.Util;
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/// <devdoc>
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/// Specifies the default value property for a control.
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/// </devdoc>
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[AttributeUsage(AttributeTargets.Class)]
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public sealed class ControlValuePropertyAttribute : Attribute {
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private readonly string _name;
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private readonly object _defaultValue;
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/// <devdoc>
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/// Initializes a new instance of the <see cref='System.Web.UI.ControlValuePropertyAttribute'/> class.
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/// </devdoc>
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public ControlValuePropertyAttribute(string name) {
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_name = name;
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}
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/// <devdoc>
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/// Initializes a new instance of the class, using the specified value as the default value.
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/// </devdoc>
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public ControlValuePropertyAttribute(string name, object defaultValue) {
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_name = name;
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_defaultValue = defaultValue;
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}
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/// <devdoc>
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/// Initializes a new instance of the class, converting the specified value to the
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/// specified type.
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/// </devdoc>
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public ControlValuePropertyAttribute(string name, Type type, string defaultValue) {
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_name = name;
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// The try/catch here is because attributes should never throw exceptions. We would fail to
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// load an otherwise normal class.
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try {
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_defaultValue = TypeDescriptor.GetConverter(type).ConvertFromInvariantString(defaultValue);
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}
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catch {
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System.Diagnostics.Debug.Fail("ControlValuePropertyAttribute: Default value of type " + type.FullName + " threw converting from the string '" + defaultValue + "'.");
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}
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}
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/// <devdoc>
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/// Gets the name of the default value property for the control this attribute is bound to.
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/// </devdoc>
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public string Name {
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get {
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return _name;
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}
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}
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/// <devdoc>
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/// Gets the value of the default value property for the control this attribute is bound to.
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/// </devdoc>
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public object DefaultValue {
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get {
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return _defaultValue;
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}
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}
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public override bool Equals(object obj) {
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ControlValuePropertyAttribute other = obj as ControlValuePropertyAttribute;
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if (other != null) {
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if (String.Equals(_name, other.Name, StringComparison.Ordinal)) {
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if (_defaultValue != null) {
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return _defaultValue.Equals(other.DefaultValue);
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}
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else {
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return (other.DefaultValue == null);
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}
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}
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}
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return false;
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}
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public override int GetHashCode() {
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return System.Web.Util.HashCodeCombiner.CombineHashCodes(
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((Name != null) ? Name.GetHashCode() : 0),
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((DefaultValue != null) ? DefaultValue.GetHashCode() : 0));
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}
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}
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}
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