C#截图操作方法大全

using System.Drawing;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
class ScreenCapture
{
private Bitmap _screenshot = null;

/// <summary>
/// 截取全屏
/// </summary>
/// <returns>返回值</returns>
public Bitmap CaptureScreen()
{
return Capture(Rectangle.Empty, false);
}

/// <summary>
/// 截取全屏并保存
/// </summary>
/// <param name="fileName">文件路径</param>
/// <returns></returns>
public Bitmap CaptureScreen(string fileName)
{
Bitmap screenshot = Capture(Rectangle.Empty, false);
saveImage(fileName, screenshot);
return screenshot;
}

/// <summary>
/// 截屏到剪切板
/// </summary>
public void CopyToClipboard()
{
if (this._screenshot != null)
Clipboard.SetImage(this._screenshot);
else if (this._screenshot == null)
MessageBox.Show("No screenshot found. Please take a screenshot first.", "Copy to Clipboard");
}

/// <summary>
/// 区域截屏
/// </summary>
/// <param name="rect">区域范围</param>
/// <returns>返回值</returns>
public Bitmap CaptureRectangle(Rectangle rect)
{
return Capture(rect, true);
}

/// <summary>
/// 区域截屏
/// </summary>
/// <param name="rect">区域范围</param>
/// <param name="fileName">文件路径</param>
/// <returns>返回值</returns>
public Bitmap CaptureRectangle(Rectangle rect, string fileName)
{
Bitmap screenshot = Capture(rect, true);
saveImage(fileName, screenshot);
return screenshot;
}

private Bitmap Capture(Rectangle rect, bool isRect)
{
int screenWidth = Screen.PrimaryScreen.Bounds.Width;
int screenHeight = Screen.PrimaryScreen.Bounds.Height;

Bitmap screenshot = null;

if(!isRect)
screenshot = new Bitmap(screenWidth, screenHeight);
else if(isRect)
screenshot = new Bitmap(rect.Width, rect.Height);

Graphics g = Graphics.FromImage(screenshot);
if (!isRect)
{
g.CopyFromScreen(Point.Empty, Point.Empty, screenshot.Size);
}
else if (isRect)
{
g.CopyFromScreen(new Point(rect.X, rect.Y), Point.Empty, rect.Size);
}

this._screenshot = screenshot;

return screenshot;
}

private void saveImage(string fileName, Bitmap screenshot)
{
string ext = System.IO.Path.GetExtension(fileName);;
ext = ext.ToLower();

if (ext == ".jpg" || ext == ".jpeg")
screenshot.Save(fileName, System.Drawing.Imaging.ImageFormat.Jpeg);
else if(ext == ".gif")
screenshot.Save(fileName, System.Drawing.Imaging.ImageFormat.Gif);
else if(ext == ".png")
screenshot.Save(fileName, System.Drawing.Imaging.ImageFormat.Png);
else if (ext == ".bmp")
screenshot.Save(fileName, System.Drawing.Imaging.ImageFormat.Bmp);
else if (ext == ".tiff")
screenshot.Save(fileName, System.Drawing.Imaging.ImageFormat.Tiff);
}
}
}