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copied!<p><strong>Second</strong> : A Solution</p> <p>Using the <code>DataContractSerializer</code> (which is used by default for WCF Services) instead of the <code>XmlSerializer</code> works a treat</p> <pre><code>[Serializable] public class MyData { public string Text { get; set; } } class Program { public static void Main(string[] args) { var myData = new MyData { Text = "hello " + ASCIIEncoding.ASCII.GetString(new byte[] { 0x12 }) + " world" }; var serializer = new DataContractSerializer(typeof(MyData)); var mem = new MemoryStream(); serializer.WriteObject(mem, myData); mem.Seek(0, SeekOrigin.Begin); MyData myData2 = (MyData)serializer.ReadObject(mem); Console.WriteLine("myData2 {0}", myData2.Text); } } </code></pre> <p><strong>Frist</strong> : A Workaround</p> <p>I can get it to choke when writing the Xml, by using an XmlWriter, which is arguably better than the client choking on it. e.g.</p> <p>However it doesn't fix the underlying problem of sending the invalid characters</p> <pre><code>[Serializable] public class MyData { public string Text { get; set; } } class Program { public static void Main(string[] args) { var myData = new MyData {Text = "hello " + ASCIIEncoding.ASCII.GetString(new byte[] { 0x12 }) + " world"}; var serializer = new System.Xml.Serialization.XmlSerializer(typeof(MyData)); var sw = new StringWriter(); XmlWriterSettings settings = new XmlWriterSettings(); using (var writer = XmlWriter.Create(sw)) { serializer.Serialize(writer, myData); // Exception // hexadecimal value 0x12, is an invalid character } var xmlReader = new StringReader(sw.ToString()); var newUser = (MyData)serializer.Deserialize(xmlReader); Console.WriteLine("User Name = {0}", newUser); } } </code></pre>

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