XML file generation in C#.net using XML.Serializer "pls help"

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Hello All,
I am storing some information in a xml file on a button click event,when i am generating a xml file am getting an error "Only one top level element tag is possible". Is it possible to have one top level element tag on another.Please help

XML Code on button click

C#

FileStream fStream = new FileStream("D:\\Test.xml", FileMode.Open);
           XmlRootAttribute xroot = new XmlRootAttribute();
           xroot.ElementName = "Root";
           xroot.Namespace = "D:\\Test.xml";
           xroot.IsNullable = true;
           foreach (DictionaryEntry item in PropertyList)
           {
              XmlSerializer xml = new XmlSerializer(item.Value.GetType(),xroot);
              xml.Serialize(fStream, item.Value);
           }

Posted 14-Jul-11 23:00pm

vajisha

Updated 14-Jul-11 23:40pm

Wayne Gaylard

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Wayne Gaylard 15-Jul-11 5:40am

Added PRE tags.

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Wayne Gaylard · Answer 1 · 2011-07-14T23:49:00

Why are you trying to recreate the Root? you don't really need to do that. Just do something like this

C#

XmlSerializer xmlFormat = new XmlSerializer(item.Value.GetType());
            using (Stream fs = new FileStream(@"D:\Test.xml", FileMode.Open, FileAccess.Write, FileShare.None))
            {
                xmlFormat.Serialize(fs, item.Value);
            }

That will append the serialised object to the stated file. If you are unsure whether the file has been created yet just use

C#

using(Stream fs = new FileStream(fileName, FileMode.OpenOrCreate,FileAccess.Write,FileShare.None))

instead, and that will create the file if it does not exist.

Hope this helps

Prerak Patel · Answer 2 · 2011-07-14T23:07:00

Solution 1

Without XML or code, we cannot point your mistake. But have a look at this. Check your code and XML.
http://forums.asp.net/t/1062792.aspx/1[^]

Posted 14-Jul-11 23:07pm

Prerak Patel

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vajisha 15-Jul-11 5:16am

i have given u the xml code

Timberbird · Answer 3 · 2011-07-14T23:48:00

You're trying to create new serializer for each item and then use it to serialize objects into the same stream using the same root element. Looks like Serialize method attempts to append newly serialized data to the stream, writing root elements for each cycle run. Consider moving

XmlSerializer xml = new XmlSerializer(item.Value.GetType(),xroot);

line outside the loop and changing constructor to another, supporting an array of types (you may fill it statically or dynamically, using another cycle). Or write data without header to the memory stream and then flush it to file :)

vajisha · Answer 4 · 2011-07-19T23:53:00

As per Wayne Gaylard's Solution i have written the followiong code but still it is showing me the same error

FileStream fStream = new FileStream("D:\\Test.xml", FileMode.OpenOrCreate,FileAccess.Write,FileShare.Read);
            foreach (DictionaryEntry item in PropertyList)
            {
                XmlSerializer xml = new XmlSerializer(item.Value.GetType());
                xml.Serialize(fStream, item.Value);
            }
MessageBox.Show("SAVED");

XML file generation in C#.net using XML.Serializer "pls help"

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