XmlWriter OutOfMemoryException

Question

I'm getting a very weird out of memory exception when saving very large string data(100 Mb) to Xml..I'm not sure. Does anyone have any ideas on what's happening? and I restricted to use only 2.0 framework.

Exception Stack:

System.OutOfMemoryException was unhandled
Message=Exception of type 'System.OutOfMemoryException' was thrown.
Source=mscorlib
StackTrace:

at System.IO.MemoryStream.set_Capacity(Int32 value)
at System.IO.MemoryStream.EnsureCapacity(Int32 value)
at System.IO.MemoryStream.Write(Byte[] buffer, Int32 offset, Int32 count)
at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
at System.IO.StreamWriter.Write(Char value)
at System.Xml.XmlTextWriter.InternalWriteEndElement(Boolean longFormat)
at System.Xml.XmlTextWriter.WriteEndElement()
at System.Xml.XmlWriter.WriteElementString(String localName, String ns, String

SampleCode:

StreamWriter streamWriter = new StreamWriter( stream );
XmlTextWriter textWriter = new XmlTextWriter(streamWriter);
XmlWriter writer = textWriter;
writer.WriteStartDocument( true );

Do you have to write all 100MB at once - can you possibly do it in chunks? — dash
– dash, Commented Dec 12, 2012 at 12:34
@HenkHolterman I wasn't very clear, but I meant the original string - rather than write out all 100MB of data from a string in memory, load a bit, write a bit, load a bit, write a bit... to a file on disk :-) — dash
– dash, Commented Dec 12, 2012 at 12:51

mashtheweb · Accepted Answer · 2012-12-12 12:37:45Z

1

You may be not although your code doesn;t show this, opening and closing the XMLWriter stream correctly, with "using". If you really want to write into memory, pass in a StringBuilder. Try this: -

using System;
using System.Text;
using System.Xml;
public class Test {
    static void Main()
    { 
        XmlWriterSettings settings = new XmlWriterSettings();
        StringBuilder builder = new StringBuilder();
        using (XmlWriter writer = XmlWriter.Create(builder, settings))
        {
            writer.WriteStartDocument();
            writer.WriteStartElement("root");
            writer.WriteStartElement("element");
            writer.WriteString("content");
            writer.WriteEndElement();
            writer.WriteEndElement();
            writer.WriteEndDocument();
            writer.Flush();
        }
        Console.WriteLine(builder);
}

}

answered Dec 12, 2012 at 12:37

mashtheweb

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1 Comment

Anjan Kant Over a year ago

I was facing same problem, me just added writer.Flush(); and it started working fine.

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