C# 图片裁剪

/// <summary>
/// 缩小裁剪图片
/// </summary>
/// <param name="int_Width">要缩小裁剪图片宽度</param>
/// <param name="int_Height">要缩小裁剪图片长度</param>
/// <param name="input_ImgUrl">要处理图片路径</param>
/// <param name="out_ImgUrl">处理完毕图片路径</param>
public void ImgReduceCutOut(int int_Width, int int_Height, string input_ImgUrl, string out_ImgUrl)
{
// ＝＝＝上传标准图大小＝＝＝
int int_Standard_Width = 160;
int int_Standard_Height = 160;
int Reduce_Width = 0; // 缩小的宽度
int Reduce_Height = 0; // 缩小的高度
int CutOut_Width = 0; // 裁剪的宽度
int CutOut_Height = 0; // 裁剪的高度
int level = 100; //缩略图的质量 1-100的范围
// ＝＝＝获得缩小，裁剪大小＝＝＝
if (int_Standard_Height * int_Width / int_Standard_Width > int_Height)
{
Reduce_Width = int_Width;
Reduce_Height = int_Standard_Height * int_Width / int_Standard_Width;
CutOut_Width = int_Width;
CutOut_Height = int_Height;
}
else if (int_Standard_Height * int_Width / int_Standard_Width < int_Height)
{
Reduce_Width = int_Standard_Width * int_Height / int_Standard_Height;
Reduce_Height = int_Height;
CutOut_Width = int_Width;
CutOut_Height = int_Height;
}
else
{
Reduce_Width = int_Width;
Reduce_Height = int_Height;
CutOut_Width = int_Width;
CutOut_Height = int_Height;
}
// ＝＝＝通过连接创建Image对象＝＝＝
System.Drawing.Image oldimage = System.Drawing.Image.fromFile(Server.MapPath(input_ImgUrl));