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FileDialog.DefaultExt Property

Gets or sets the default file name extension.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public string DefaultExt { get; set; }
/** @property */
public String get_DefaultExt ()

/** @property */
public void set_DefaultExt (String value)

public function get DefaultExt () : String

public function set DefaultExt (value : String)

Not applicable.

Property Value

The default file name extension. The returned string does not include the period. The default value is an empty string ("").

The following code example demonstrates using the RichTextBox.SaveFile and RichTextBox.LoadFile methods with streams. It also demonstrates using the FileName, DefaultExt, SaveFileDialog.CreatePrompt, and SaveFileDialog.OverwritePrompt members.

This is a complete example that is ready to run when you copy it to your project.

using System.Windows.Forms;



public class Form1:
	System.Windows.Forms.Form

{
	
	internal System.Windows.Forms.RichTextBox RichTextBox1;
	internal System.Windows.Forms.Button Button1;
	internal System.Windows.Forms.RichTextBox RichTextBox2;
	internal System.Windows.Forms.Button Button2;
	internal System.Windows.Forms.SaveFileDialog SaveFileDialog1;

	public Form1() : base()
	{   
		
		this.RichTextBox1 = new System.Windows.Forms.RichTextBox();
		this.Button1 = new System.Windows.Forms.Button();
		this.RichTextBox2 = new System.Windows.Forms.RichTextBox();
		this.Button2 = new System.Windows.Forms.Button();
		this.SaveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
		this.SuspendLayout();
		this.RichTextBox1.Location = new System.Drawing.Point(24, 64);
		this.RichTextBox1.Name = "RichTextBox1";
		this.RichTextBox1.TabIndex = 0;
		this.RichTextBox1.Text = "Type something here.";
		this.Button1.Location = new System.Drawing.Point(96, 16);
		this.Button1.Name = "Button1";
		this.Button1.Size = new System.Drawing.Size(96, 24);
		this.Button1.TabIndex = 1;
		this.Button1.Text = "Save To Stream";
		this.Button1.Click += new System.EventHandler(Button1_Click);
		this.RichTextBox2.Location = new System.Drawing.Point(152, 64);
		this.RichTextBox2.Name = "RichTextBox2";
		this.RichTextBox2.TabIndex = 3;
		this.RichTextBox2.Text = "It will be added to the stream " 
			+ "and appear here.";
		this.Button2.Location = new System.Drawing.Point(104, 200);
		this.Button2.Name = "Button2";
		this.Button2.Size = new System.Drawing.Size(88, 32);
		this.Button2.TabIndex = 4;
		this.Button2.Text = "Save Stream To File";
		this.Button2.Click += new System.EventHandler(Button2_Click);
		this.ClientSize = new System.Drawing.Size(292, 266);
		this.Controls.Add(this.Button2);
		this.Controls.Add(this.RichTextBox2);
		this.Controls.Add(this.Button1);
		this.Controls.Add(this.RichTextBox1);
		this.Name = "Form1";
		this.Text = "Form1";
		this.ResumeLayout(false);

	}


	public static void Main()
	{
		Application.Run(new Form1());
	}


	// Declare a new memory stream.
	System.IO.MemoryStream userInput = new System.IO.MemoryStream();

	// Save the content of RichTextBox1 to the memory stream, 
	// appending a LineFeed character.  
	private void Button1_Click(System.Object sender, 
		System.EventArgs e)
	{
		RichTextBox1.SaveFile(userInput, 
			RichTextBoxStreamType.PlainText);
		userInput.WriteByte(13);

		// Display the entire contents of the stream,
		// by setting its position to 0, to RichTextBox2.
		userInput.Position = 0;
		RichTextBox2.LoadFile(userInput, 
			RichTextBoxStreamType.PlainText);
	}

	// Shows the use of a SaveFileDialog to save a MemoryStream to a file.
	private void Button2_Click(System.Object sender, System.EventArgs e)
	{

		// Set the properties on SaveFileDialog1 so the user is 
		// prompted to create the file if it doesn't exist 
		// or overwrite the file if it does exist.
		SaveFileDialog1.CreatePrompt = true;
		SaveFileDialog1.OverwritePrompt = true;

		// Set the file name to myText.txt, set the type filter
		// to text files, and set the initial directory to drive C.
		SaveFileDialog1.FileName = "myText";
		SaveFileDialog1.DefaultExt = "txt";
		SaveFileDialog1.Filter = "Text files (*.txt)|*.txt";
		SaveFileDialog1.InitialDirectory = "c:\\";

		// Call ShowDialog and check for a return value of DialogResult.OK,
		// which indicates that the file was saved. 
		DialogResult result = SaveFileDialog1.ShowDialog();
		System.IO.Stream fileStream;

		if (result == DialogResult.OK)

			// Open the file, copy the contents of memoryStream to fileStream,
			// and close fileStream. Set the memoryStream.Position value to 0 to 
			// copy the entire stream. 
		{
			fileStream = SaveFileDialog1.OpenFile();
			userInput.Position = 0;
			userInput.WriteTo(fileStream);
			fileStream.Close();
		}
	}
}

import System.Windows.Forms.*;

public class Form1 extends System.Windows.Forms.Form
{
    System.Windows.Forms.RichTextBox richTextBox1;
    System.Windows.Forms.Button button1;
    System.Windows.Forms.RichTextBox richTextBox2;
    System.Windows.Forms.Button button2;
    System.Windows.Forms.SaveFileDialog saveFileDialog1;

    public Form1()
    {
        super();
        this.richTextBox1 = new System.Windows.Forms.RichTextBox();
        this.button1 = new System.Windows.Forms.Button();
        this.richTextBox2 = new System.Windows.Forms.RichTextBox();
        this.button2 = new System.Windows.Forms.Button();
        this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
        this.SuspendLayout();
        this.richTextBox1.set_Location(new System.Drawing.Point(24, 64));
        this.richTextBox1.set_Name("RichTextBox1");
        this.richTextBox1.set_TabIndex(0);
        this.richTextBox1.set_Text("Type something here.");
        this.button1.set_Location(new System.Drawing.Point(96, 16));
        this.button1.set_Name("Button1");
        this.button1.set_Size(new System.Drawing.Size(96, 24));
        this.button1.set_TabIndex(1);
        this.button1.set_Text("Save To Stream");
        this.button1.add_Click(new System.EventHandler(button1_Click));
        this.richTextBox2.set_Location(new System.Drawing.Point(152, 64));
        this.richTextBox2.set_Name("RichTextBox2");
        this.richTextBox2.set_TabIndex(3);
        this.richTextBox2.set_Text("It will be added to the stream "
            + "and appear here.");
        this.button2.set_Location(new System.Drawing.Point(104, 200));
        this.button2.set_Name("Button2");
        this.button2.set_Size(new System.Drawing.Size(88, 32));
        this.button2.set_TabIndex(4);
        this.button2.set_Text("Save Stream To File");
        this.button2.add_Click(new System.EventHandler(button2_Click));
        this.set_ClientSize(new System.Drawing.Size(292, 266));
        this.get_Controls().Add(this.button2);
        this.get_Controls().Add(this.richTextBox2);
        this.get_Controls().Add(this.button1);
        this.get_Controls().Add(this.richTextBox1);
        this.set_Name("Form1");
        this.set_Text("Form1");
        this.ResumeLayout(false);
    } //Form1

    public static void main(String[] args)
    {
        Application.Run(new Form1());
    } //main

    // Declare a new memory stream.
    private System.IO.MemoryStream userInput = new System.IO.MemoryStream();

    // Save the content of RichTextBox1 to the memory stream, 
    // appending a LineFeed character.  
    private void button1_Click(Object sender, System.EventArgs e)
    {
        richTextBox1.SaveFile(userInput, RichTextBoxStreamType.PlainText);
        userInput.WriteByte(System.Convert.ToByte(13));
        // Display the entire contents of the stream,
        // by setting its position to 0, to RichTextBox2.
        userInput.set_Position(0);
        richTextBox2.LoadFile(userInput, RichTextBoxStreamType.PlainText);
    } //button1_Click

    // Shows the use of a SaveFileDialog to save a MemoryStream to a file.
    private void button2_Click(Object sender, System.EventArgs e)
    {
        // Set the properties on SaveFileDialog1 so the user is 
        // prompted to create the file if it doesn't exist 
        // or overwrite the file if it does exist.
        saveFileDialog1.set_CreatePrompt(true);
        saveFileDialog1.set_OverwritePrompt(true);
        // Set the file name to myText.txt, set the type filter
        // to text files, and set the initial directory to drive C.
        saveFileDialog1.set_FileName("myText");
        saveFileDialog1.set_DefaultExt("txt");
        saveFileDialog1.set_Filter("Text files (*.txt)|*.txt");
        saveFileDialog1.set_InitialDirectory("c:\\");
        // Call ShowDialog and check for a return value of DialogResult.OK,
        // which indicates that the file was saved. 
        DialogResult result = saveFileDialog1.ShowDialog();
        System.IO.Stream fileStream;

        if (result.Equals(DialogResult.OK)) {
            // Open the file, copy the contents of memoryStream to fileStream,
            // and close fileStream. Set the memoryStream.Position value to 0 to 
            // copy the entire stream. 
            fileStream = saveFileDialog1.OpenFile();
            userInput.set_Position(0);
            userInput.WriteTo(fileStream);
            fileStream.Close();
        }
    } //button2_Click
} //Form1

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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