.Net实现上传图片按比例自动缩小或放大的方法


            本文实例主要展示了.Net实现上传图片按比例自动缩小或放大的方法，是非常实用的功能。分享给大家供大家参考之用。具体方法如下：





//// <summary>

/// 按比例缩小图片，自动计算宽度

/// </summary>

/// <param name="strOldPic">源图文件名(包括路径)</param>

/// <param name="strNewPic">缩小后保存为文件名(包括路径)</param>

/// <param name="intHeight">缩小至高度</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>

/// 缩小图片

/// </summary>

/// <param name="strOldPic">源图文件名(包括路径)</param>

/// <param name="strNewPic">缩小后保存为文件名(包括路径)</param>

/// <param name="intWidth">缩小至宽度</param>

/// <param name="intHeight">缩小至高度</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;

  }

}







希望本文所述实例对大家的asp.net程序设计有一定的借鉴价值。