GuidConverter.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 / CompMod / System / ComponentModel / GuidConverter.cs / 1 / GuidConverter.cs
                        

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

/* 
 */ 
namespace System.ComponentModel {
    using Microsoft.Win32; 
    using System.ComponentModel.Design.Serialization;
    using System.Diagnostics;
    using System.Globalization;
    using System.Reflection; 
    using System.Runtime.InteropServices;
    using System.Runtime.Remoting; 
    using System.Runtime.Serialization.Formatters; 
    using System.Security.Permissions;
 
    /// 
    ///    Provides a
    ///       type converter to convert globally unique identifier objects to and from various
    ///       other representations. 
    /// 
    [HostProtection(SharedState = true)] 
    public class GuidConverter : TypeConverter { 

        ///  
        ///    Gets a value indicating whether this
        ///       converter can convert an object in the given source type to a globally unique identifier object
        ///       using the context.
        ///  
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
            if (sourceType == typeof(string)) { 
                return true; 
            }
            return base.CanConvertFrom(context, sourceType); 
        }

        /// 
        ///    Gets a value indicating whether this converter can 
        ///       convert an object to the given destination type using the context.
        ///  
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { 
            if (destinationType == typeof(InstanceDescriptor)) {
                return true; 
            }
            return base.CanConvertTo(context, destinationType);
        }
 
        /// 
        ///    Converts 
        ///       the given object to a globally unique identifier object. 
        /// 
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { 
            if (value is string) {
                string text = ((string)value).Trim();
                return new Guid(text);
            } 
            return base.ConvertFrom(context, culture, value);
        } 
 
        /// 
        ///      Converts the given object to another type.  The most common types to convert 
        ///      are to and from a string object.  The default implementation will make a call
        ///      to ToString on the object if the object is valid and if the destination
        ///      type is string.  If this cannot convert to the desitnation type, this will
        ///      throw a NotSupportedException. 
        /// 
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { 
            if (destinationType == null) { 
                throw new ArgumentNullException("destinationType");
            } 

            if (destinationType == typeof(InstanceDescriptor) && value is Guid) {
                ConstructorInfo ctor = typeof(Guid).GetConstructor(new Type[] {typeof(string)});
                if (ctor != null) { 
                    return new InstanceDescriptor(ctor, new object[] {value.ToString()});
                } 
            } 

            return base.ConvertTo(context, culture, value, destinationType); 
        }
    }
}

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