Fill Form Fields in Word Document in C#

We have already demonstrated how to create form field. This article mainly shows you how developers fill form field in word document in C# only with 4 simple steps by using a standalone .NET Word component Spire.Doc.

Make sure Spire.Doc for .NET has been installed correctly and then add Spire.Doc.dll as reference in the downloaded Bin folder thought the below path: "..\Spire.Doc\Bin\NET4.0\ Spire.Doc.dll". Here comes to the details of how developers Fill Form Field by using Spire.Doc:

Step 1: Open the form that needs to fill the data.

[C#]

//Create word document
Document document = new Document(@"..\..\..\Data\UserForm.doc");

Step 2: Load data that will fill the form.

[C#]

//Fill data from XML file
using (Stream stream = File.OpenRead(@"..\..\..\Data\User.xml"))
{
    XPathDocument xpathDoc = new XPathDocument(stream);
    XPathNavigator user = xpathDoc.CreateNavigator().SelectSingleNode("/user");

Step 3: Use the loaded data to fill the form.

[C#]

//fill data
  foreach (FormField field in document.Sections[0].Body.FormFields)
  {
     String path = String.Format("{0}/text()", field.Name);
     XPathNavigator propertyNode = user.SelectSingleNode(path);
     if (propertyNode != null)
     {
         switch (field.Type)
         {
             case FieldType.FieldFormTextInput:
                  field.Text = propertyNode.Value;
                  break;

             case FieldType.FieldFormDropDown:
                  DropDownFormField combox = field as DropDownFormField;
                  for(int i = 0; i < combox.DropDownItems.Count; i++)
                  {
                      if (combox.DropDownItems[i].Text == propertyNode.Value)
                      {
                         combox.DropDownSelectedIndex = i;
                         break;
                      }
                      if (field.Name == "country" && combox.DropDownItems[i].Text == "Others")
                      {
                         combox.DropDownSelectedIndex = i;
                      }
                  }
                  break;

             case FieldType.FieldFormCheckBox:
                  if (Convert.ToBoolean(propertyNode.Value))
                  {
                      CheckBoxFormField checkBox = field as CheckBoxFormField;
                      checkBox.Checked = true;
                  }
                  break;
            }
       }
   }
 }

Step 4: Save the document to file in XML or Microsoft Word format.

[C#]

//Save doc file
document.SaveToFile("Sample.doc",FileFormat.Doc);

Effective Screenshot:

Fill FormField

Full Source Code for Fill FormField:

[C#]

namespace FillFormField
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //open form
            Document document = new Document(@"..\..\..\..\..\..\Data\UserForm.doc");

            //load data
            using (Stream stream = File.OpenRead(@"..\..\..\..\..\..\Data\User.xml"))
            {
                XPathDocument xpathDoc = new XPathDocument(stream);
                XPathNavigator user = xpathDoc.CreateNavigator().SelectSingleNode("/user");

                //fill data
                foreach (FormField field in document.Sections[0].Body.FormFields)
                {
                    String path = String.Format("{0}/text()", field.Name);
                    XPathNavigator propertyNode = user.SelectSingleNode(path);
                    if (propertyNode != null)
                    {
                        switch (field.Type)
                        {
                            case FieldType.FieldFormTextInput:
                                field.Text = propertyNode.Value;
                                break;

                            case FieldType.FieldFormDropDown:
                                DropDownFormField combox = field as DropDownFormField;
                                for(int i = 0; i < combox.DropDownItems.Count; i++)
                                {
                                    if (combox.DropDownItems[i].Text == propertyNode.Value)
                                    {
                                        combox.DropDownSelectedIndex = i;
                                        break;
                                    }
                                    if (field.Name == "country" && combox.DropDownItems[i].Text == "Others")
                                    {
                                        combox.DropDownSelectedIndex = i;
                                    }
                                }
                                break;

                            case FieldType.FieldFormCheckBox:
                                if (Convert.ToBoolean(propertyNode.Value))
                                {
                                    CheckBoxFormField checkBox = field as CheckBoxFormField;
                                    checkBox.Checked = true;
                                }
                                break;
                        }
                    }
                }
            }

            //Save doc file.
            document.SaveToFile("Sample.doc",FileFormat.Doc);

            //Launching the MS Word file.
            WordDocViewer("Sample.doc");
        }

        private void WordDocViewer(string fileName)
        {
            try
            {
                System.Diagnostics.Process.Start(fileName);
            }
            catch { }
        }

    }
}

Fill Form Fields in Word Document in C#

See Also