XML document (0, 0) has an error. The root element is missing.

 

Function t validate (string Str ){

Using (memorystream MS = new memorystream ())
{
Foreach (byte _ byte in encoding. Default. getbytes (STR ))
{
Ms. writebyte (_ byte );
}

Result = (t) New xmlserializer (typeof (t). deserialize (MS );
Ms. Close ();
}

}

 
System. invalidoperationexception message not processed = "  XML document (0, 0) has an error.  "  Source = "  System. xml  " Stacktrace: in system. XML. serialization. xmlserializer. deserialize (xmlreader, string encodingstyle, xmldeserializationevents events) in system. XML. serialization. xmlserializer. deserialize (Stream stream) in nflicense. class1.load [T] (fileinfo file) Location E: \ hy \ www \ ABC \ test. CS: row number  131  In nflicense. class1.load (string filename) Location E: \ hy \ www \ ABC \ test. CS: row number  209  In nflicense. class1.validate (string linesepath, string pubkey, string productname, string username) Location E: \ hy \ www \ nfcrm \ ABC \ test. CS: row number  217  In nfcrm. program. Main (string [] ARGs) Location E: \ hy \ www \ nfcrm \ ABC \ Program. CS: row number 22  In system. appdomain. _ nexecuteassembly (Assembly, string [] ARGs) in system. appdomain. executeassembly (string assemblyfile, evidence assemblysecurity, string [] ARGs) in Microsoft. visual Studio. hostingprocess. hostproc. runusersassembly () in system. threading. threadhelper. threadstart_context (Object State) in system. threading. executioncontext. run (executioncontext, contextcallback callback, object state) in system. threading. threadhelper. threadstart () innerexception: system. XML. xmlexception message = "  The root element is missing.  "  Source = " System. xml  "  Linenumber = 0  Lineposition = 0  Sourceuri = "" Stacktrace: in system. XML. xmltextreaderimpl. throw (exception E) in system. XML. xmltextreaderimpl. throwwithoutlineinfo (string res) in system. XML. xmltextreaderimpl. parsedocumentcontent () in system. XML. xmltextreaderimpl. read () in system. XML. xmltextreader. read () in system. XML. xmlreader. movetocontent () in Microsoft. XML. serialization. generatedassembly. xmlserializationreaderlicense. read3_license () innerexception: 

 

 

Solution:

Before serialization, add:

Ms. Position = 0;

Function t validate (StringStr ){Using(Memorystream MS =NewMemorystream ()){Foreach(Byte_ ByteInEncoding. Default. getbytes (STR) {Ms. writebyte (_ byte);} result= (T)NewXmlserializer (Typeof(T). deserialize (MS); Ms. Close ();}}
 

 

Solution Source: http://www.cnblogs.com/nikytwo/archive/2009/03/27/1423032.html