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  1. using System;
  2. using System.Collections.Generic;
  3. using System.IO;
  4. using System.Text;
  5. using System.Xml;
  6. namespace ConsoleApplication1
  7. {
  8.     class Program
  9.     {
  10.         public static void Main(string[] args)
  11.         {
  12.             var doc = new XmlDocument();
  13.             var stream = new MemoryStream();
  14.  
  15.             XmlDeclaration xmlDeclaration = doc.CreateXmlDeclaration("1.0", "utf-8", null);
  16.             XmlElement rootNode = doc.CreateElement("rexim");
  17.             rootNode.InnerText = "давлоыдаывалдыовадлы";
  18.             rootNode.SetAttribute("xmlns", "rexim:coding-team:test");
  19.             doc.InsertBefore(xmlDeclaration, doc.DocumentElement);
  20.             doc.AppendChild(rootNode);
  21.  
  22.             XmlWriterSettings settings = new XmlWriterSettings()
  23.             {
  24.                 Indent = true
  25.             };
  26.  
  27.             using( var writer = XmlWriter.Create(stream,settings)) {
  28.                 doc.Save(writer);
  29.             }
  30.         }
  31.     }
  32. }
  33.  
Runtime error #stdin #stdout #stderr 0.08s 30736KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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Unhandled Exception:
System.Xml.XmlException: Cannot redefine the namespace for prefix '' used at current element
  at System.Xml.XmlTextWriter.WriteEndAttribute () [0x00000] in <filename unknown>:0 
  at System.Xml.DefaultXmlWriter.WriteEndAttribute () [0x00000] in <filename unknown>:0 
  at System.Xml.XmlAttribute.WriteTo (System.Xml.XmlWriter w) [0x00000] in <filename unknown>:0 
  at System.Xml.XmlElement.WriteTo (System.Xml.XmlWriter w) [0x00000] in <filename unknown>:0 
  at System.Xml.XmlDocument.WriteContentTo (System.Xml.XmlWriter xw) [0x00000] in <filename unknown>:0 
  at System.Xml.XmlDocument.Save (System.Xml.XmlWriter w) [0x00000] in <filename unknown>:0 
  at ConsoleApplication1.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.Xml.XmlException: Cannot redefine the namespace for prefix '' used at current element
  at System.Xml.XmlTextWriter.WriteEndAttribute () [0x00000] in <filename unknown>:0 
  at System.Xml.DefaultXmlWriter.WriteEndAttribute () [0x00000] in <filename unknown>:0 
  at System.Xml.XmlAttribute.WriteTo (System.Xml.XmlWriter w) [0x00000] in <filename unknown>:0 
  at System.Xml.XmlElement.WriteTo (System.Xml.XmlWriter w) [0x00000] in <filename unknown>:0 
  at System.Xml.XmlDocument.WriteContentTo (System.Xml.XmlWriter xw) [0x00000] in <filename unknown>:0 
  at System.Xml.XmlDocument.Save (System.Xml.XmlWriter w) [0x00000] in <filename unknown>:0 
  at ConsoleApplication1.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0
https://ideone.com/WomcFN
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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