DataSourceCacheDurationConverter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / DataSourceCacheDurationConverter.cs / 1 / DataSourceCacheDurationConverter.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.ComponentModel.Design.Serialization;
    using System.Globalization;
    using System.Reflection; 
    using System.Security.Permissions;
    using System.Web.Util; 
 

    ///  
    /// Converts a cache duration such as an integer or the text "Infinite" to a cache duration, where "Infinite" implies zero (0).
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public class DataSourceCacheDurationConverter : Int32Converter {
        private StandardValuesCollection _values; 
 

        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { 
            if (sourceType == typeof(string)) {
                return true;
            }
            else { 
                return base.CanConvertFrom(context, sourceType);
            } 
        } 

 
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
            if (value == null)
                return null;
 
            string stringValue = value as string;
            if (stringValue != null) { 
                string textValue = stringValue.Trim(); 
                if (textValue.Length == 0) {
                    return 0; 
                }

                if (String.Equals(textValue, "infinite", StringComparison.OrdinalIgnoreCase)) {
                    return 0; 
                }
            } 
 
            return base.ConvertFrom(context, culture, value);
        } 


        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
            if (destinationType == typeof(string)) { 
                return true;
            } 
            else { 
                return base.CanConvertTo(context, destinationType);
            } 
        }


        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { 
            if ((value != null) && (destinationType == typeof(string)) && ((int)value == 0)) {
                return "Infinite"; 
            } 
            else {
                return base.ConvertTo(context, culture, value, destinationType); 
            }
        }

 
        public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) {
            if (_values == null) { 
                object[] values = new object[] { 0 }; 

                _values = new StandardValuesCollection(values); 
            }
            return _values;
        }
 

        public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) { 
            return false; 
        }
 

        public override bool GetStandardValuesSupported(ITypeDescriptorContext context) {
            return true;
        } 
    }
}

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