Filling in a docvariable in Word docx using C#

I've done this a hundred times in VB 6 but it's driving me nuts using C# 2008 and Word 2007. I created a docx file with two docvariables:

Some text here....

{docvariable replace1}
{docvariable replace2}

More text here......

I created a macro first to do it and it works:

Sub FillDocVariable()
'
' FillDocVariable Macro
'
'

  ActiveDocument.Variables("replace1").Value = "This is a test"
  ActiveDocument.Variables("replace2").Value = "it is only a test."
  ActiveDocument.Fields.Update

End Sub

Here's my C# code (mind you I'm learning this as I go):

using Microsoft.Office.Interop.Word;
 object paramMissing = Type.Missing;
       object openfileName = @"C:\testing\Documents\1.docx";

      ApplicationClass WordApplication = new ApplicationClass();
      Document WordDocument = WordApplication.Documents.Open(ref 开发者_运维知识库openfileName, 
        ref paramMissing, ref paramMissing, ref paramMissing,
        ref paramMissing, ref paramMissing, ref paramMissing,
        ref paramMissing, ref paramMissing, ref paramMissing,
        ref paramMissing, ref paramMissing, ref paramMissing,
        ref paramMissing, ref paramMissing, ref paramMissing);

      WordDocument.Variables("replace1") = "This is a test";
      WordDocument.Variables("replace2").Value = "it's only a test!";
      WordDocument.Fields.Update;

Here's the error I get:

Error 1 Non-invocable member 'Microsoft.Office.Interop.Word._Document.Variables' cannot be used like a method. Blockquote

If you're interested, the way to do this via VS 2010 & Word 2010 is as follows:

Application app = new Application();
Document doc = word.Documents.Add(filepath);
doc.Variables["var_name"].Value = your_value_here;
doc.Fields.Update();
doc.Save();
doc.Close();
app.Quit();

I think that you missed a ".value" in your code...

WordDocument.Variables("replace1") = "This is a test";

should be written as:

WordDocument.Variables("replace1").Value = "This is a test";

The first guess: WordDocument.Variables("replace1") → WordDocument.Variables["replace1"].

Update after finding it in MSDN: Apparently, the indexer is a ref parameter — see MSDN. So, you have to use a variable like this:

string replace = "replace1";
WordDocument.Variables[ref replace] = ...;

Strange. Perhaps there's a reason for such an API design.

Also, since the indexer does not define a setter, an assignment won't work. You would have to manipulate the internals of the Variable instance returned by the getter.

Try this:

object variable1 = "This is a test";
object variable2 = "it's only a test!";
Variable var1 = WordDocument.Variables.Add("replace1", ref variable1);
Variable var2 = WordDocument.Variables.Add("replace2", ref variable1);
WordDocument.Fields.Update();