Returns the passed-in string instance if all the characters in the string argument are valid whitespace characters.
Syntax
Parameters
- content
Returns
Returns the passed-in string instance if all the characters in the string argument are valid whitespace characters, otherwise null.
Remarks
No other values than the passed in argument should be returned. The characters that are valid for whitespace do not vary between XML editions, so no xml version overload is required.
See tp://go.microsoft.com/fwlink/?LinkID=147985 production [3] S for details on the allowed characters.
If the parameter is null, an ArgumentNullException will be thrown.
If any of the characters are not valid whitespace characters, an XmlException is thrown with information about the first invalid character encountered.
Requirements
Assembly: System.Xml (in System.Xml.dll)
Assembly Versions: 4.0.0.0