Zoom is a basic as well useful function in any text file reader. Users can chose to zoom out or zoom in of a document depending on how small the font is, or on their own view preference. In this article, I’ll introduce two ways to zoom Word file using Spire.DocViewer:

• Zoom with a particular zoom mode
• Zoom by entering a percentage

Now, I will explain more by creating a Windows Forms Application. Some steps about how to add DocVierwer control to toolbox and how to open Word file using Spire.DocViewer have been demonstrated previously. In the following section, I only add a MenuItem and a TextBox to Form1.

In the MenuItem, named Zoom, I create three sub-items which are used to save three particular zoom modes.

• Default: View page in its original size.
• Fit to page: When this option is selected, the document will be resized to match the dimensions of your view window.
• Fit to width: When this option is selected, the document will best fit to width of window.

Code behind:

        private void defaultToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.docDocumentViewer1.ZoomMode = ZoomMode.Default;
        }
        private void fitToPageToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.docDocumentViewer1.ZoomMode = ZoomMode.FitPage;
        }
        private void fitToWidthToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.docDocumentViewer1.ZoomMode = ZoomMode.FitWidth;
        }

Another way to zoom in or out of Word document is enter a desired percentage in TextBox.

Code for TextBox:

      private void toolStripTextBox1_KeyDown(object sender, KeyEventArgs e)
        {
            if (Keys.Enter == e.KeyCode)
            {
                int p;
                if (int.TryParse(this.toolStripTextBox1.Text, out p))
                {
                    this.docDocumentViewer1.ZoomTo(p);
                }
            }
        }

Run the program, you can get following windows application.

Fit to Width:

Zoom with 50 percentages:

This article has demonstrated how to create a Windows Forms Application to open and close Word file using Spire.DocViewer. Now, we are adding a print button to Form1 to fulfill the print feature for this Word document viewer.

Detailed Steps

Step 1: Add another button to Form1, and set the following properties for it in the Properties Window:

• Name: btnPrint
• DisplayStyle: Image
• Image: Print.Properties.Resources.Print

Step 2: Double click the button to write code. In this button code, we firstly instantiate an object of System.Windows.Forms.PrintDialog and set some of its relative properties. Call ShowDialog method to make the print dialog visible.

    private void btnPrint_Click(object sender, EventArgs e)
        {
            //Show a Print Dialog
            PrintDialog dialog = new PrintDialog();
            dialog.AllowCurrentPage = true;
            dialog.AllowSomePages = true;
            dialog.UseEXDialog = true;
            DialogResult result = dialog.ShowDialog();
            //...
         }

Step 3: Set print parameters of DocDocumentViewer.PrintDialog and print the document.

            //...
                 if (result == DialogResult.OK)
            {
                try
                {
                    //Set print parameters.
                    this.docDocumentViewer1.PrintDialog = dialog;
                    //Gets the PrintDocument.
                    dialog.Document = docDocumentViewer1.PrintDocument;
                    dialog.Document.Print();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }

Run the program, open an existing Word file and click 'Print' button, you'll get a dialog as below: