97 lines
3.1 KiB
C#
97 lines
3.1 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="DataSourceCacheDurationConverter.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.Collections;
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using System.ComponentModel;
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using System.ComponentModel.Design.Serialization;
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using System.Globalization;
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using System.Reflection;
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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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/// Converts a cache duration such as an integer or the text "Infinite" to a cache duration, where "Infinite" implies zero (0).
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/// </devdoc>
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public class DataSourceCacheDurationConverter : Int32Converter {
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private StandardValuesCollection _values;
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public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
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if (sourceType == typeof(string)) {
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return true;
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}
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else {
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return base.CanConvertFrom(context, sourceType);
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}
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}
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public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
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if (value == null)
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return null;
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string stringValue = value as string;
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if (stringValue != null) {
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string textValue = stringValue.Trim();
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if (textValue.Length == 0) {
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return 0;
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}
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if (String.Equals(textValue, "infinite", StringComparison.OrdinalIgnoreCase)) {
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return 0;
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}
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}
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return base.ConvertFrom(context, culture, value);
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}
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public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
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if (destinationType == typeof(string)) {
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return true;
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}
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else {
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return base.CanConvertTo(context, destinationType);
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}
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}
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public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
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if ((value != null) && (destinationType == typeof(string)) && ((int)value == 0)) {
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return "Infinite";
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}
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else {
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return base.ConvertTo(context, culture, value, destinationType);
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}
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}
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public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) {
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if (_values == null) {
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object[] values = new object[] { 0 };
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_values = new StandardValuesCollection(values);
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}
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return _values;
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}
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public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) {
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return false;
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}
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public override bool GetStandardValuesSupported(ITypeDescriptorContext context) {
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return true;
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}
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}
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}
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