Edit form controls with GemBox.Document

Question

How can we write or modify existing values of form controls in Word documents using GemBox.Document?
I found the examples for creating and reading, but I just cannot find one for writing...

I tried using this:

// Input file from 'reading' example.
DocumentModel document = DocumentModel.Load("FormFilled.docx");
FormFieldDataCollection formData = document.Content.FormFieldsData;

FormFieldData fullNameData = formData.First(ffd => ffd.Name == "FullName");

// I cannot do this, FormFieldData.Value is read only!
fullNameData.Value = "My Name";

But FormFieldData.Value has only get, so is this possible or not?

Answer 1

Yes this is possible, try this:

DocumentModel document = DocumentModel.Load("FormFilled.docx");
// Get a snapshot of all form fields in the document.
FormFieldDataCollection formData = document.Content.FormFieldsData;

// Edit "FullName" text box field.
FormTextData fullNameData = (FormTextData)formData["FullName"];
fullNameData.Field.ResultInlines.Content.LoadText("Jane Doe");

// Edit "BirthDate" text box field.
FormTextData birthDateData = (FormTextData)formData["BirthDate"];
birthDateData.Field.ResultInlines.Content.LoadText(
    new DateTime(2000, 1, 1).ToString(birthDateData.ValueFormat));

// Edit "Salary" text box field.
FormTextData salaryData = (FormTextData)formData["Salary"];
salaryData.Field.ResultInlines.Content.LoadText(
    5432.1.ToString(salaryData.ValueFormat));

// Uncheck "Married" check box field.
FormCheckBoxData marriedData = (FormCheckBoxData)formData["Married"];
marriedData.Value = false;

// Select "Female" from drop down field, note that "genderData.Items
// contains a list of drop down field's items that you can select.
FormDropDownData genderData = (FormDropDownData)formData["Gender"];
genderData.SelectedItemIndex = 2;

document.Save("FormFilledOutput.docx");

I hope this helps.

UPDATE:

In one of a newer GemBox.Document's bug fix versions the FormTextData.Value property has both getter and setter, so the above can be simplified with the following:

// Edit "FullName" text box field.
FormTextData fullNameData = (FormTextData)formData["FullName"];
fullNameData.Value = "Jane Doe";

// Edit "BirthDate" text box field.
FormTextData birthDateData = (FormTextData)formData["BirthDate"];
birthDateData.Value = new DateTime(2000, 1, 1);

// Edit "Salary" text box field.
FormTextData salaryData = (FormTextData)formData["Salary"];
salaryData.Value = 5432.1;

Also you can refer to this example.