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XmlTextWriter.IndentChar Property

Gets or sets which character to use for indenting when Formatting is set to Formatting.Indented.

Namespace:  System.Xml
Assembly:  System.Xml (in System.Xml.dll)
public char IndentChar { get; set; }

Property Value

Type: System.Char
The character to use for indenting. The default is space.
NoteNote

The XmlTextWriter allows you to set this property to any character. To ensure valid XML, you must specify a valid white space character, 0x9, 0x10, 0x13 or 0x20.

Note Note

In the .NET Framework version 2.0 release, the recommended practice is to create XmlWriter instances using the XmlWriter.Create method and the XmlWriterSettings class. This allows you to take full advantage of all the new features introduced in this release. For more information, see Creating XML Writers.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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XmlTextWriter - Valid white space characters - Invalid codes?

The note about the XmlTextWriter says the following: "To ensure valid XML, you must specify a valid white space character, 0x9, 0x10, 0x13 or 0x20".

I wonder if these codes are the correct ones. As far as I know, these are hexadecimal values so it should say "To ensure valid XML, you must specify a valid white space character, 0x9, 0xA, 0xD or 0x20"

Indeed 0x10 is DLE and 0x13 is DC3, and these characters are not valid in XML.