How can I take a screenshot of a Winforms control/form in C#?

by

Forms are controls, so you should be able to save the entire contents to a bitmap with something like:

var bm = new Bitmap(yourForm.Width, yourForm.Height);
yourForm.DrawToBitmap(bm, bm.Size);
bm.Save(@"c:\whatever.gif", ImageFormat.Gif);

Update

DrawToBitmap only draws what’s on-screen. If you want to draw the entire contents of the list you must iterate through the list to find the size of the contents then draw each item. Something like:

var f = yourControl.Font;
var lineHeight = f.GetHeight();

// Find size of canvas
var s = new SizeF();
using (var g = yourControl.CreateGraphics())
{
    foreach (var item in yourListBox.Items)
    {
        s.Height += lineHeight ;
        var itemWidth = g.MeasureString(item.Text, f).Width;
        if (s.Width < itemWidth)
            s.Width = itemWidth;
    }

    if (s.Width < yourControl.Width)
         s.Width = yourControl.Width;
}

using( var canvas = new Bitmap(s) )
using( var g = Graphics.FromImage(canvas) )
{
    var pt = new PointF();
    foreach (var item in yourListBox.Items)
    {
        pt.Y += lineHeight ;
        g.DrawString(item.Text, f, Brushes.Black, pt);
    }

    canvas.Save(wherever);
}

More Related Contents:

  1. C# ListView Column Width Auto
  2. How to prevent flickering in ListView when updating a single ListViewItem’s text?
  3. Changing color of scroll bar in ListView in WinForms
  4. Find control by name from Windows Forms controls
  5. How do I make a WinForms app go Full Screen
  6. How to save a List on Settings.Default?
  7. Get File Icon used by Shell
  8. Playing a MP3 file in a WinForm application
  9. Get all controls of a specific type
  10. How can I treat the circle as a control after drawing it? – Moving and selecting shapes
  11. How to create an Explorer-like folder browser control?
  12. How to change the color of winform DataGridview header?
  13. Interaction between WebBrowser Control and Windows Forms
  14. How to change listview selected row backcolor even when focus on another control?
  15. How to Draw a Rounded Rectangle with WinForms (.NET)?
  16. Dynamic button creation & placing them in a predefined order using c#
  17. Get the SourceControl of a DropDownMenu
  18. How to know if a line intersects a rectangle
  19. Find out the control with last focus
  20. Parent Control Mouse Enter/Leave Events With Child Controls
  21. Failed to update .mdf database because the database is read-only (Windows application)
  22. How do I disable visual styles for just one control, and not its children?
  23. How to simulate Windows shutdown for debugging?
  24. Populating a ComboBox using C#
  25. ContextMenuStrip.Owner Property null When Retrieving From Nested ToolStripMenuItem
  26. How to create a form with a border, but no title bar? (like volume control on Windows 7)
  27. DataGridView Image for Button Column
  28. Passing a variable between Windows Forms forms
  29. What does “Beta: Use Unicode UTF-8 for worldwide language support” actually do?
  30. How to set a text box for inputing password in winforms?

Leave a Comment