本文實(shí)例主要展示了.Net實(shí)現(xiàn)上傳圖片按比例自動(dòng)縮小或放大的方法，是非常實(shí)用的功能。分享給大家供大家參考之用。具體方法如下：
//// summary>
/// 按比例縮小圖片，自動(dòng)計(jì)算寬度
/// /summary>
/// param name="strOldPic">源圖文件名(包括路徑)/param>
/// param name="strNewPic">縮小后保存為文件名(包括路徑)/param>
/// param name="intHeight">縮小至高度/param>
public void SmallPicWidth(string strOldPic, string strNewPic, int intHeight)
{
System.Drawing.Bitmap objPic, objNewPic;
try
{
objPic = new System.Drawing.Bitmap(strOldPic);
int intWidth = (intHeight / objPic.Height) * objPic.Width;
objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);
objNewPic.Save(strNewPic);
}
catch (Exception exp) { throw exp; }
finally
{
objPic = null;
objNewPic = null;
}
}
/**//// summary>
/// 縮小圖片
/// /summary>
/// param name="strOldPic">源圖文件名(包括路徑)/param>
/// param name="strNewPic">縮小后保存為文件名(包括路徑)/param>
/// param name="intWidth">縮小至寬度/param>
/// param name="intHeight">縮小至高度/param>
public void SmallPic(string strOldPic, string strNewPic, int intWidth, int intHeight)
{
System.Drawing.Bitmap objPic, objNewPic;
try
{
objPic = new System.Drawing.Bitmap(strOldPic);
objNewPic = new System.Drawing.Bitmap(objPic, intWidth, intHeight);
objNewPic.Save(strNewPic);
}
catch (Exception exp)
{ throw exp; }
finally
{
objPic = null;
objNewPic = null;
}
}
