64 lines
1.6 KiB
C#
64 lines
1.6 KiB
C#
//------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------
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namespace System.ServiceModel.Diagnostics
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{
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using System.Xml;
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using System.Text;
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using System.IO;
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class EncodingFallbackAwareXmlTextWriter : XmlTextWriter
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{
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Encoding encoding;
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internal EncodingFallbackAwareXmlTextWriter(TextWriter writer)
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: base(writer)
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{
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this.encoding = writer.Encoding;
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}
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public override void WriteString(string value)
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{
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if (!string.IsNullOrEmpty(value) &&
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ContainsInvalidXmlChar(value))
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{
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byte[] blob = encoding.GetBytes(value);
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value = encoding.GetString(blob);
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}
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base.WriteString(value);
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}
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bool ContainsInvalidXmlChar(string value)
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{
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if (string.IsNullOrEmpty(value))
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{
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return false;
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}
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int i = 0;
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int len = value.Length;
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while (i < len)
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{
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if (XmlConvert.IsXmlChar(value[i]))
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{
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i++;
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continue;
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}
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if (i + 1 < len &&
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XmlConvert.IsXmlSurrogatePair(value[i + 1], value[i]))
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{
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i += 2;
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continue;
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}
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return true;
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}
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return false;
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}
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}
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}
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