_UriTypeConverter.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 / Net / System / _UriTypeConverter.cs / 1 / _UriTypeConverter.cs
                        

                        
                            /*++ 
Copyright (c) 2003 Microsoft Corporation

Module Name:
 
    _UriTypeConverter.cs
 
Abstract: 

    A default TypeConverter implementation for the System.Uri type 

Revision History:

--*/ 
namespace System {
using System.Globalization; 
using System.ComponentModel; 
using System.ComponentModel.Design.Serialization;
using System.Reflection; 

    //
    // A limited conversion is implemented such as to and from string
    // A conversion to InstanceDescriptor is also provided for design time support. 
    //
    public class UriTypeConverter: TypeConverter 
    { 
        private UriKind m_UriKind;
 

        public UriTypeConverter() : this(UriKind.RelativeOrAbsolute) { }

        internal UriTypeConverter(UriKind uriKind) 
        {
            m_UriKind = uriKind; 
        } 

 
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            if (sourceType == null)
                throw new ArgumentNullException("sourceType"); 

            if (sourceType == typeof(string)) 
                return true; 

            if (typeof(Uri).IsAssignableFrom(sourceType)) 
                return true;

            return base.CanConvertFrom(context, sourceType);
        } 
        //
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) 
        { 
            if (destinationType == typeof(InstanceDescriptor))
                return true; 

            if (destinationType == typeof(string))
                return true;
 
            if (destinationType == typeof(Uri))
                return true; 
 
            return base.CanConvertTo(context, destinationType);
        } 
        //
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture,  object value)
        {
            string uriString = value as string; 
            if (uriString != null)
                return new Uri(uriString, m_UriKind); 
 
            Uri uri = value as Uri;
            if (uri != null) 
                return new Uri(uri.OriginalString,
                    m_UriKind == UriKind.RelativeOrAbsolute ? uri.IsAbsoluteUri ? UriKind.Absolute : UriKind.Relative : m_UriKind);

            return base.ConvertFrom(context, culture, value); 
        }
        // 
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) 
        {
            Uri uri = value as Uri; 

            if (uri != null && destinationType == typeof(InstanceDescriptor))
            {
                ConstructorInfo ci = typeof(Uri).GetConstructor(BindingFlags.Public | BindingFlags.Instance, null, new Type[]{typeof(string), typeof(UriKind)}, null); 
                return new InstanceDescriptor(ci, new object[] { uri.OriginalString,
                    m_UriKind == UriKind.RelativeOrAbsolute ? uri.IsAbsoluteUri ? UriKind.Absolute : UriKind.Relative : m_UriKind }); 
            } 

            if (uri != null && destinationType == typeof(string)) 
                return uri.OriginalString;

            if (uri != null && destinationType == typeof(Uri))
                return new Uri(uri.OriginalString, 
                    m_UriKind == UriKind.RelativeOrAbsolute ? uri.IsAbsoluteUri ? UriKind.Absolute : UriKind.Relative : m_UriKind);
 
            return base.ConvertTo(context, culture, value, destinationType); 
        }
        // 
        public override bool IsValid(ITypeDescriptorContext context, object value)
        {
            string str = value as string;
            Uri temp; 
            if (str != null)
                return Uri.TryCreate(str, m_UriKind, out temp); 
 
            return value is Uri;
        } 
    }

}

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