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XmlConvert.VerifyXmlChars Method

Returns the passed-in string if all the characters and surrogate pair characters in the string argument are valid XML characters, otherwise an XmlException is thrown with information on the first invalid character encountered.

Namespace:  System.Xml
Assemblies:   System.Xml (in System.Xml.dll)
  System.Xml.ReaderWriter (in System.Xml.ReaderWriter.dll)

public static string VerifyXmlChars(
	string content
)

Parameters

content
Type: System.String

String that contains characters to verify.

Return Value

Type: System.String
Returns the passed-in string if all the characters and surrogate-pair characters in the string argument are valid XML characters, otherwise an XmlException is thrown with information on the first invalid character encountered.

No other values than the passed in argument should be returned. See XML 1.0 spec (fourth edition) production [2] Char for details on the allowed characters.

If the parameter is null, an ArgumentNullException will be thrown. If any of the characters are not valid xml characters, an XmlException is thrown with information on the first invalid character encountered.

The following example uses the VerifyXmlChars method used to detect an illegal character in the start element.

            XmlTextWriter writer3 = new XmlTextWriter("outFile.xml", null);
            char illegalChar = '\uFFFE';
            string charsToVerify = "Test String "; 

            try
            {
                // Write the root element.
                writer3.WriteStartElement("root");

                // Throw an exception due illegal character.
                writer3.WriteStartElement(
                    XmlConvert.VerifyXmlChars(charsToVerify + illegalChar));

                writer3.WriteString("ValueText");
                writer3.WriteEndElement();

                // Write the end tag for the root element.
                writer3.WriteEndElement();

                writer3.Close();

            }
            catch (XmlException e)
            {
                Console.WriteLine(e.Message);
                writer3.Close();
            }

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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