/// <summary>
/// 壓縮圖片
/// </summary>
/// <returns></returns>
public string ResizePic()
{
#region 壓縮圖片開始
bool IsImgFile = true; //判斷是否為圖片文件
string filePathName = "123"; //文件存儲的路徑（文件夾名稱）
string fileName = "a.jpg"; //上傳文件的原始名稱
string fileSysName = DateTime.Now.ToString("yyyyMMddHHmmssfff") + "_" + fileName; //修改后的文件名稱
string filePath = ""; //文件路徑
string strImgPath = "/fileupload/"; //上傳路徑
if (IsImgFile)
{
int maxWidth = 600; //圖片寬度最大限制
int maxHeight = 400; //圖片高度最大限制
System.Drawing.Image imgPhoto =
System.Drawing.Image.FromFile(Server.MapPath(strImgPath) + filePathName + "/" + fileSysName);
int imgWidth = imgPhoto.Width;
int imgHeight = imgPhoto.Height;
if (imgWidth > imgHeight) //如果寬度超過高度以寬度為準來壓縮
{
if (imgWidth > maxWidth) //如果圖片寬度超過限制
{
float toImgWidth = maxWidth; //圖片壓縮后的寬度
float toImgHeight = imgHeight / (float)(imgWidth / toImgWidth); //圖片壓縮后的高度

System.Drawing.Bitmap img = new System.Drawing.Bitmap(imgPhoto,
int.Parse(toImgWidth.ToString()),
int.Parse(toImgHeight.ToString()));
string strResizePicName = Server.MapPath(strImgPath) + filePathName + "/_small_" + fileSysName;
img.Save(strResizePicName); //保存壓縮后的圖片
filePath = strImgPath + filePathName + "/_small_" + fileSysName; //返回壓縮后的圖片路徑
}
}
else
{
if (imgHeight > maxHeight)
{
float toImgHeight1 = maxHeight;
float toImgWidth1 = imgWidth / (float)(imgHeight / toImgHeight1);

System.Drawing.Bitmap img = new System.Drawing.Bitmap(imgPhoto,
int.Parse(toImgWidth1.ToString()),
int.Parse(toImgHeight1.ToString()));
string strResizePicName = Server.MapPath(strImgPath) + filePathName + "/_small_" + fileSysName;
img.Save(strResizePicName);
filePath = strImgPath + filePathName + "/_small_" + fileSysName;
}
}
}
return filePath;
#endregion
}