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ASP.NET中的状态管理(7)

作者:AspCool

来源:ASPCool

热度:

2006-10-21 13:14:38

以下是引用片段：
Dim fs As FileStream = CType(saveFileDialog1.OpenFile(), FileStream)
  ' Save the Image in the appropriate ImageFormat based upon the
  ' file type selected in the dialog box.
  ' NOTE that the FilterIndex property is one-based.
  Select Case saveFileDialog1.FilterIndex
  Case 1
  Me.button2.Image.Save(fs, ImageFormat.Jpeg)

  Case 2
  Me.button2.Image.Save(fs, ImageFormat.Bmp)

  Case 3
  Me.button2.Image.Save(fs, ImageFormat.Gif)
  End Select

  fs.Close()
  End If
  End Sub

  // C#
  // NOTE: You must import the following namespaces:
  // using System.IO;
  // using System.Drawing.Imaging;
  // Without these import statements at the beginning of your code,
  // the code example will not function.
  private void button2_Click(object sender, System.EventArgs e)
  {
  // Display an SaveFileDialog so the user can save the Image
  // assigned to Button2.
  SaveFileDialog saveFileDialog1 = new SaveFileDialog();
  saveFileDialog1.Filter = "JPeg Image*.jpgBitmap Image*.bmpGif Image*.gif";
  saveFileDialog1.Title = "Save an Image File";
  saveFileDialog1.ShowDialog();

  // If the file name is not an empty string open it for saving.
  if(saveFileDialog1.FileName != "")
  {
  // Save the Image via a FileStream created by the OpenFile method.
  FileStream fs = (FileStream)saveFileDialog1.OpenFile();
  // Save the Image in the appropriate ImageFormat based upon the
  // File type selected in the dialog box.
  // NOTE that the FilterIndex property is one-based.
  switch(saveFileDialog1.FilterIndex)
  {
  case 1 :
  this.button2.Image.Save(fs,ImageFormat.Jpeg);
  break;

  case 2 :
  this.button2.Image.Save(fs,ImageFormat.Bmp);
  break;

  case 3 :
  this.button2.Image.Save(fs,ImageFormat.Gif);
  break;
  }

  fs.Close();
  }
  }

关于写入文件流的进一步信息，请参阅 FileStream.BeginWrite 方法。

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