如何在C＃窗體應用程序中使用保存文件對話框將圖表另存爲圖像

Question

單擊按鈕時，我想要將圖表另存爲帶保存文件對話框的圖像。我的應用程序類型是c＃Windows窗體應用程序。因此，用戶可以將圖像文件保存在他/她希望的任何目錄中。

Answer 1

我已經做出瞭解決方法：使用字典文件擴展名

private void exportAsImagebtn_Click(object sender, EventArgs e) 
{ 
    SaveFileDialog saveFileDialog = new SaveFileDialog(); 
    saveFileDialog.Filter = "PNG Image|*.png|JPeg Image|*.jpg"; 
    saveFileDialog.Title = "Save Chart As Image File"; 
    saveFileDialog.FileName = "Sample.png"; 

    DialogResult result = saveFileDialog.ShowDialog(); 
    saveFileDialog.RestoreDirectory = true; 

    if (result == DialogResult.OK && saveFileDialog.FileName != "") 
    { 
     try 
     { 
      if (saveFileDialog.CheckPathExists) 
      { 
       if (saveFileDialog.FilterIndex == 2) 
       { 
        chart.SaveImage(saveFileDialog.FileName, ChartImageFormat.Jpeg); 
       } 
       else if (saveFileDialog.FilterIndex == 1) 
       { 
        chart.SaveImage(saveFileDialog.FileName, ChartImageFormat.Png); 
       } 

      } 
      else 
      { 
       MessageBox.Show("Given Path does not exist"); 
      } 
     } 
     catch(Exception ex){ 
      MessageBox.Show(ex.Message); 
     } 
    }  
} 

Answer 2

或者這樣：

try 
{ 
    //Check if chart has at least one enabled series with points 
    if (chart1.Series.Any(s => s.Enabled && s.Points.Count>0)) 
    { 
     SaveFileDialog save = new SaveFileDialog(); 
     save.Filter = "Image Files|*.png;"; 
     save.Filter = "Bitmap Image (.bmp)|*.bmp|Gif Image (.gif)|*.gif|JPEG Image (.jpeg)|*.jpeg|Png Image (.png)|*.png|Tiff Image (.tiff)|*.tiff"; 
     save.Title = "Save Chart Image As file"; 
     save.DefaultExt = ".png"; 
     if (save.ShowDialog() == DialogResult.OK) 
     { 
      var imgFormats = new Dictionary<string, ChartImageFormat>() 
      { 
       {".bmp", ChartImageFormat.Bmp}, 
       {".gif", ChartImageFormat.Gif}, 
       {".jpg", ChartImageFormat.Jpeg}, 
       {".jpeg", ChartImageFormat.Jpeg}, 
       {".png", ChartImageFormat.Png}, 
       {".tiff", ChartImageFormat.Tiff}, 
      }; 
      var fileExt = System.IO.Path.GetExtension(save.FileName).ToString().ToLower(); 
      if (imgFormats.ContainsKey(fileExt)) 
      { 
       chart1.SaveImage(save.FileName, imgFormats[fileExt]); 
      } 
      else 
      { 
       throw new Exception(String.Format("Only image formats '{0}' supported", string.Join(", ", imgFormats.Keys))); 
      } 
     } 
    } 
    else 
    { 
     throw new Exception("Nothing to export"); 
    } 
} 
catch (Exception ex) 
{ 
    MessageBox.Show("SaveChartAsImage()", ex.Message); 
}