Export data from C# winForms treeView to MS-Word MergeFields

Question

I have a winForm app written in c# and i have a treeview contains files from a directory. It also contains data about each files (fullpath,creation time,size) it look like this:

I am trying to export this data to MS-Word template look like this:

My problem is to duplicate the mergeFields for each File and to insert each file properties (The number of files changes) in place to look like this:

This is my Code:

private void btnExportWord_Click_1(object sender, EventArgs e)
    {
        object oMissing = Missing.Value;
        Word.Application oWord = new Word.Application();
        Word.Document oWordDoc = new Word.Document();
        oWord.Visible = false;
        oWordDoc = oWord.Documents.Add(ref oMissing, ref oMissing, ref oMissing, ref oMissing);           
        Object oTemplatePath = @"C:\test\MyXMLTemplate.dotx";         
        oWordDoc = oWord.Documents.Add(ref oTemplatePath, ref oMissing, ref oMissing, ref oMissing);

        for (int i = 0; i < treeViewXMLFiles.Nodes[0].Nodes.Count; i++)
        {
            string strFilename = treeViewXMLFiles.Nodes[0].Nodes[i].Text;
            string strFull_path = treeViewXMLFiles.Nodes[0].Nodes[i].Nodes[0].Text;
            string strCreationTime = treeViewXMLFiles.Nodes[0].Nodes[i].Nodes[1].Text;
            string strSize = treeViewXMLFiles.Nodes[0].Nodes[i].Nodes[2].Text;

            foreach (Word.Field myMergeField in oWordDoc.Fields)
            {
                Word.Range rngFieldCode = myMergeField.Code;
                String fieldText = rngFieldCode.Text;
                if (fieldText.StartsWith(" MERGEFIELD"))
                {
                    Int32 endMerge = fieldText.IndexOf("\\");
                    Int32 fieldNameLength = fieldText.Length - endMerge;
                    String fieldName = fieldText.Substring(11, endMerge - 11);
                    fieldName = fieldName.Trim();

                    if (fieldName == "File_Name")
                    {
                        myMergeField.Select();
                        oWord.Selection.TypeText(strFilename);
                    }
                    if (fieldName == "Full_Path")
                    {
                        myMergeField.Select();
                        oWord.Selection.TypeText(strFull_path);
                    }
                    if (fieldName == "CreationTime")
                    {
                        myMergeField.Select();
                        oWord.Selection.TypeText(strCreationTime);
                    }
                    if (fieldName == "Size")
                    {
                        myMergeField.Select();
                        oWord.Selection.TypeText(strSize);
                    }
                }
            }                
        }           
        Object oSaveAsFile = (Object)@"C:\test\FINISHED_XML_Template.doc";            
        oWordDoc.SaveAs(ref oSaveAsFile, ref oMissing, ref oMissing, ref oMissing,
ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
ref oMissing, ref oMissing, ref oMissing, ref oMissing, ref oMissing,
ref oMissing, ref oMissing);

        oWordDoc.Close(false, ref oMissing, ref oMissing);
        oWord.Quit(ref oMissing, ref oMissing, ref oMissing);
    }

I'm tying to look for an answer for a long time with no success.
I hope anyone here could help me.

Answer 1

If duplicating merge fields in a single document you should do the following:

1. Create the single target document.

2. Load the template with the merge field as another document.

3. In the for (int i = 0; i < treeViewXMLFiles.Nodes[0].Nodes.Count; i++) loop, do the following:

   3.1 Select the content of the template and append it to the target document.

   3.2 Replace(!) the merge fields in the target document(!) with the data from the current treeview node. Note that you need to replace the fields in the target document, so that the fields are gone and just 'plain' text remains. If you don't do that, the for-loop stumbles over the very same fields again during following iterations and messing up previously copied content. (Your code does seem to do the field replacements properly already.)

Any text which should only appear once before or after the sequence with the merge fields (like the "Hello all" introductory phrase, for example) needs to be appended to the target document before/after the for-loop executes.

Keeping these text snippets in separate template files keeps your code comparatively easy, but you will have to deal with up to three template files instead of just a single one. However, after you got substantial experience with programming C# and Word, you might think about an approach allowing you to maintain only a single template. (There are different ways to do that; for example, you might use specific formatting styles in your template to mark content to be duplicated for each treeview node and content which should appear only once in the target document.)