Change MergeField to text only

Question

I need to replace text into MergeField and do it simply text. I found question on the topic. It works for me. This code changes the text, but leaves the field as MergeField. And other question that change MergeField to text. But if there are several such fields in one line, the second one will be deleted.

At this point, I've tweaked the code from the first link a bit. What do I need to add to change MergeField to text?

string sourceFile = @"C:\Users\Owl\Desktop\Template.docm";
string targetFile = @"C:\Users\Owl\Desktop\Result.docx";
File.Copy(sourceFile, targetFile, true);
using (WordprocessingDocument document = WordprocessingDocument.Open(targetFile, true))
{
    document.ChangeDocumentType(WordprocessingDocumentType.Document);

    foreach (FieldCode field in document.MainDocumentPart
                                        .RootElement.Descendants<FieldCode>())
    {
        int indexEndName = field.Text.IndexOf("\\");
        string fieldName = string.Format("«{0}»", 
                                  field.Text.Substring(11, indexEndName - 11).Trim());

        foreach (Run run in document.MainDocumentPart.Document.Descendants<Run>())
        {
            foreach (Text txtFromRun in run.Descendants<Text>()
                                           .Where(a => a.Text == fieldName))
            {
                txtFromRun.Text = "some text";
            }
        }
    }

    document.MainDocumentPart.Document.Save();
}

UPDATE

I made a mistake. The code on the second link. The second field in the line not deleted. It stays. But does not fall into the cycle, is ignored. I don't understand why.

Answer 1

Problem

The code from the topic only works when MergeField is in different paragraphs. If there are more than one paragraph, only the first MergeField will be processed. The rest are ignored.

This is because the parent element is removed.

Run rFldCode = (Run)field.Parent; 
...
rFldCode.Remove();

The next element of the foreach will be from the next paragraph. I mean the first loop of my question code.

Solution

Collect all parts of a MergeField in the List.

Run rFldParent = (Run)field.Parent;
List<Run> runs = new List<Run>();

runs.Add(rFldParent.PreviousSibling<Run>()); // begin
runs.Add(rFldParent.NextSibling<Run>()); // separate
runs.Add(runs.Last().NextSibling<Run>()); // text
runs.Add(runs.Last().NextSibling<Run>()); // end

Picture for clarity. It helped me a lot to understand.

Now remove these items

foreach(Run run in runs)
{
    run.Remove();
}

As well as the text field <w:instrText xml:space="preserve"> MERGEFIELD...

field.Remove(); // instrText

And add new text

rFldParent.Append(new Text(replacementText));

Now, instead of just the MergeField is text only.

Full code

string sourceFile = @"C:\Users\Owl\Desktop\Template.docm";
string targetFile = @"C:\Users\Owl\Desktop\Result.docx";
File.Copy(sourceFile, targetFile, true);
using (WordprocessingDocument document = WordprocessingDocument.Open(targetFile, true))
{
    document.ChangeDocumentType(WordprocessingDocumentType.Document);

    foreach (FieldCode field in document.MainDocumentPart.RootElement.Descendants<FieldCode>())
    {
        ReplaceMergeFieldWithText(field, "some text");
    }

    document.MainDocumentPart.Document.Save();
}

private void ReplaceMergeFieldWithText(FieldCode field, string replacementText)
{
    if (field == null || replacementText == string.Empty)
    {
        return;
    }

    Run rFldParent = (Run)field.Parent;
    List<Run> runs = new List<Run>();

    runs.Add(rFldParent.PreviousSibling<Run>()); // begin
    runs.Add(rFldParent.NextSibling<Run>()); // separate
    runs.Add(runs.Last().NextSibling<Run>()); // text
    runs.Add(runs.Last().NextSibling<Run>()); // end

    foreach(Run run in runs)
    {
        run.Remove();
    }

    field.Remove(); // instrText
    rFldParent.Append(new Text(replacementText));
}

Bonus

To insert different values, you must create a Dictionary. Where the key is the MergeField name and the value is the text to insert.

To short the field name

int indexEndName = field.Text.IndexOf("\\");
string fieldName = field.Text.Substring(11, indexEndName - 11).Trim();

For example

Dictionary<string, string> dict = new Dictionary<string, string>();
dict.Add("key 1", "value 1");
dict.Add("key 2", "value 2");
dict.Add("key 3", "value 3");

...

foreach (FieldCode field in document.MainDocumentPart.RootElement.Descendants<FieldCode>())
{
    int indexEndName = field.Text.IndexOf("\\");
    string fieldName = field.Text.Substring(11, indexEndName - 11).Trim();

    ReplaceMergeFieldWithText(field, dict[fieldName]);
}