转：保存图片方法

#region c方法
/// <summary>
/// 保存图片方法
/// </summary>
/// <param name="bitMap">图片Bitmap对象</param>
private void SaveImage(Bitmap bitMap)
{
bool isSave = true;
SaveFileDialog saveImageDialog = new SaveFileDialog();
saveImageDialog.Title = "Capture screen image save dialog";
saveImageDialog.Filter = @"jpeg|*.jpg|bmp|*.bmp|gif|*.gif";

if (saveImageDialog.ShowDialog() == DialogResult.OK)
{
string fileName = saveImageDialog.FileName.ToString();

if (fileName != "" && fileName != null)
{
string fileExtName = fileName.Substring(fileName.LastIndexOf(".") + 1).ToString();

System.Drawing.Imaging.ImageFormat imgformat = null;

if (fileExtName != "")
{
switch (fileExtName)
{
case "jpg":
imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;
break;
case "bmp":
imgformat = System.Drawing.Imaging.ImageFormat.Bmp;
break;
case "gif":
imgformat = System.Drawing.Imaging.ImageFormat.Gif;
break;
default:
MessageBox.Show("只能存取为: jpg,bmp,gif 格式");
isSave = false;
break;
}

}

//默认保存为JPG格式
if (imgformat == null)
{
imgformat = System.Drawing.Imaging.ImageFormat.Jpeg;
}

if (isSave)
{
try
{
bitMap.Save(fileName, imgformat);
MessageBox.Show("图片已经成功保存!");
}
catch
{
MessageBox.Show("保存失败!");
}
}

}

}
}
#endregion