EncodingFallbackAwareXmlTextWriter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / SMDiagnostics / System / ServiceModel / Diagnostics / EncodingFallbackAwareXmlTextWriter.cs / 1305376 / EncodingFallbackAwareXmlTextWriter.cs
                        

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

namespace System.ServiceModel.Diagnostics 
{
    using System.Xml; 
    using System.Text; 
    using System.IO;
 
    class EncodingFallbackAwareXmlTextWriter : XmlTextWriter
    {
        Encoding encoding;
 
        internal EncodingFallbackAwareXmlTextWriter(TextWriter writer)
            : base(writer) 
        { 
            this.encoding = writer.Encoding;
        } 

        public override void WriteString(string value)
        {
            if (!string.IsNullOrEmpty(value) && 
                ContainsInvalidXmlChar(value))
            { 
                byte[] blob = encoding.GetBytes(value); 
                value = encoding.GetString(blob);
            } 
            base.WriteString(value);
        }

        bool ContainsInvalidXmlChar(string value) 
        {
            if (string.IsNullOrEmpty(value)) 
            { 
                return false;
            } 

            int i = 0;
            int len = value.Length;
 
            while (i < len)
            { 
                if (XmlConvert.IsXmlChar(value[i])) 
                {
                    i++; 
                    continue;
                }

                if (i + 1 < len && 
                    XmlConvert.IsXmlSurrogatePair(value[i + 1], value[i]))
                { 
                    i += 2; 
                    continue;
                } 

                return true;
            }
 
            return false;
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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