Removing a namespace prefix “asmv2” of an attribute is throwing system.nullreferenceexception

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C#

ASP.NET

XML

.NET

ClickOnce

Hi All,

I have an issue while removing namespace prfix "asmv2". It is throwing null reference exception.

Please see below code snippet:

<pre>/// <summary>
  /// Remove lines from the manifest that contain filenames that do not
  /// exist in the addin bin folder
  /// </summary>
  /// <param name="manifest">Manifest file to edit</param>
  private static void SanitizeManifestToMatchBin(string manifest, string addInBinFolder)
  {
     // load manifest
     XDocument xDoc = XDocument.Load(manifest);
     xDoc.Root.Attribute(XNamespace.Xmlns + "asmv2").Remove();
     XNamespace ns = "urn:schemas-microsoft-com:asm.v2";

     // remove any files from dependentAssembly/codebase that do not exist in the bin folder
     xDoc.Descendants(ns + "dependentAssembly")
        .Where(x => (string)x.Attribute("dependencyType") == "install" && File.Exists(addInBinFolder + "\\" + (string)x.Attribute("codebase").Value) == false)
        .Select(x => x.Parent)
        .Remove();

     //xDoc.Descendants(ns + "file")
     //   .Where(x => File.Exists(addInBinFolder + "\\" + (string)x.Attribute("name").Value) == false)
     //   .Select(x => x)
     //   .Remove();

     //xDoc.Descendants(ns + "file").Remove();
     xDoc.Save(manifest);
  }

At above code snippet,

xDoc.Root.Attribute(XNamespace.Xmlns + "asmv2").Remove(); //is throwing null reference exception.

Below is my xml manifest:

<pre><asmv1:assembly xsi:schemaLocation="urn:schemas-microsoft-com:asm.v1 assembly.adaptive.xsd" manifestVersion="1.0" 
xmlns:asmv1="urn:schemas-microsoft-com:asm.v1" xmlns="urn:schemas-microsoft-com:asm.v2" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:co.v1="urn:schemas-microsoft-com:clickonce.v1" 
xmlns:asmv3="urn:schemas-microsoft-com:asm.v3" 
xmlns:dsig="http://www.w3.org/2000/09/xmldsig#" 
xmlns:co.v2="urn:schemas-microsoft-com:clickonce.v2">

What I have tried:

In above xml manifest, I found that "asmv2" is not available and I am trying to remove this entry.I tried checking why this entry is not there but no luck.

Please help me to solve this problem.

Thank you.