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RegionData Class

Encapsulates the data that makes up a Region object. This class cannot be inherited.

Namespace:  System.Drawing.Drawing2D
Assembly:  System.Drawing (in System.Drawing.dll)

public sealed class RegionData

The following example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

  • Creates a rectangle and draw its to the screen in black.

  • Creates a region using the rectangle.

  • Gets the RegionData.

  • Draws the region data (an array of bytes) to the screen, by using the DisplayRegionData helper function.

public void GetRegionDataExample(PaintEventArgs e)

    // Create a rectangle and draw it to the screen in black.
    Rectangle regionRect = new Rectangle(20, 20, 100, 100);
    e.Graphics.DrawRectangle(Pens.Black, regionRect);

    // Create a region using the first rectangle.
    Region myRegion = new Region(regionRect);

    // Get the RegionData for this region.
    RegionData myRegionData = myRegion.GetRegionData();
    int myRegionDataLength = myRegionData.Data.Length;
    DisplayRegionData(e, myRegionDataLength, myRegionData);

public void DisplayRegionData(PaintEventArgs e,
    int len,
    RegionData dat)

    // Display the result. 
    int i;
    float x = 20, y = 140;
    Font myFont = new Font("Arial", 8);
    SolidBrush myBrush = new SolidBrush(Color.Black);
    e.Graphics.DrawString("myRegionData = ",
        new PointF(x, y));
    y = 160;
    for(i = 0; i < len; i++)
        if(x > 300)
            y += 20;
            x = 20;
            new PointF(x, y));
        x += 30;


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0