[Mono-bugs] [Bug 52607][Blo] New - enum serialization is not fully compatibly with Microsoft.

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Mon, 5 Jan 2004 11:29:03 -0500 (EST)

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Changed by mordechait@mainsoft.com.


--- shadow/52607	2004-01-05 11:29:03.000000000 -0500
+++ shadow/52607.tmp.4541	2004-01-05 11:29:03.000000000 -0500
@@ -0,0 +1,94 @@
+Bug#: 52607
+Product: Mono/Class Libraries
+Version: unspecified
+OS Details: 
+Status: NEW   
+Priority: Blocker
+Component: System.XML
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: mordechait@mainsoft.com               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+Summary: enum serialization is not fully compatibly with Microsoft.
+Description of Problem:
+Enum serialization (to a file for example) is not readable by Micorsoft VS
+2003 clients when using the namespace attribute (XmlTypeAttribute) attached
+to that enum.
+Steps to reproduce the problem:
+1. Write some console application that serialize some enum into a file.
+the enum must have a custom attibute:
+2. run the program using MONO.
+3. Write some console application that reads this file and construct the
+object . Run it under Visual Studio , not Mono. 
+Actual Results:
+an exception sample:
+System.InvalidOperationException error:There is an error in XML document
+(2, 2).
+   at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader
+xmlReader, String encodingStyle)
+   at System.Xml.Serialization.XmlSerializer.Deserialize(TextReader textReader)
+Expected Results:
+successful deserializing.
+How often does this happen? 
+Additional Information:
+Lets take an example when we have an enum:
+public  enum Powers {ergsPersec,milliwatts,watts,}
+The problem in MONO is that the output of the serialization is:
+<?xml version="1.0" encoding="utf-8"?>
+<Powers xmlns="http://www.webserviceX.NET/">kilowatts</Powers>
+And Microsoft's output is always :
+<?xml version="1.0" encoding="utf-8"?>
+Therefore, when de-serializing the output - MONO fails.
+I have a fix :
+where : XmlSerializationWriterInterpreter.cs line:111 in method:
+protected virtual void WriteObject (XmlTypeMapping typeMap, object ob,
+string element, string namesp, bool isNullable, bool needType, bool
+in the section where:		
+if (writeWrappingElem)
+  if (map != typeMap || _format == SerializationFormat.Encoded) 
+    needType = true;
+  WriteStartElement (element, namesp, ob);  <------------- BUG BUG !
+this section is buggy since in case of an enum you sould set namesp=""
+(empty string)
+therefore the fix is to add a small switch case.
+// Mordechai: In Microsoft they drop the namespace printout of an enum type
+// even if the user added the attribute
+// XmlTypeAttribute(Namespace="http://www.XXX.NET/"). 
+// It is completely ignored. therefore, I send empty string instead of the 
+// real ns .
+// Additional fix may be to change XmlTypeMapping ctor so in case of enum 
+// it will set this.ns="";
+switch (map.TypeData.SchemaType)
+	case SchemaTypes.Enum: WriteStartElement (element, "", ob); break;
+	default: WriteStartElement (element, namesp, ob);break;