上传，重命名和调整图像大小时出现ASP.NET错误

下午，我试图使用asp.net FileUpload控件上传文件。在保存图像之前，我需要使用用户GUID重命名文件，然后将图像大小调整为128像素。上传，重命名和调整图像大小时出现ASP.NET错误

但是，当它去保存我收到错误在GDI +发生了一般性错误。和我不能解决如何得到这个排序。

可能有人在看我的代码，并提供一些指导，请

protected void btnUpload_Click(object sender, EventArgs e) 
    { 
     Guid userGuid = (Guid)Membership.GetUser().ProviderUserKey; 

     string directory = Server.MapPath("imgs/users"); 
     string fileExt = Path.GetExtension(fuSample.PostedFile.FileName); 
     string fileName = userGuid + fileExt; 

     //Check File ext, make sure its an image! 
     if (fileExt == ".jpeg" || fileExt == ".jpg" || fileExt == ".png" || fileExt == ".gif") 
     { 
      //Now we check to make sure its less than 600kb 
      if (fuSample.PostedFile.ContentLength < 614400) 
      { 
       //Delete an existing file. 
       if (File.Exists(directory + fileName)) 
        File.Delete(directory + fileName); 

       // Create a bitmap of the content of the fileUpload control in memory 
       Bitmap originalBMP = new Bitmap(fuSample.FileContent); 

       // Calculate the new image dimensions 
       int origWidth = originalBMP.Width; 
       int origHeight = originalBMP.Height; 
       int sngRatio = origWidth/origHeight; 
       int newWidth = 128; 
       int newHeight = newWidth/sngRatio; 

       // Create a new bitmap which will hold the previous resized bitmap 
       Bitmap newBMP = new Bitmap(originalBMP, newWidth, newHeight); 
       // Create a graphic based on the new bitmap 
       Graphics oGraphics = Graphics.FromImage(newBMP); 

       // Set the properties for the new graphic file 
       oGraphics.SmoothingMode = SmoothingMode.AntiAlias; oGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic; 
       // Draw the new graphic based on the resized bitmap 
       oGraphics.DrawImage(originalBMP, 0, 0, newWidth, newHeight); 

       // Save the new graphic file to the server 
       newBMP.Save(directory + fileName); 

       // Once finished with the bitmap objects, we deallocate them. 
       originalBMP.Dispose(); 
       newBMP.Dispose(); 
       oGraphics.Dispose(); 


       //Success! 

      } 
      else 
      { 
       //error here, img too big 
      } 
     } 
     else 
     { 
      notifybar.Attributes.Add("style", "display:block;"); 
      notifybar.Attributes.Add("class", "failed"); 
      notifyText.Text = "Valid Image files only please! (.png, .jpg, .jpeg, or .gif)"; 
     } 
    }

来源

2013-04-24 thatuxguy

它可以像一个文件覆盖冲突这样简单的事情。然而，这段代码有许多危险的错误，并且它不是非常有效地使用RAM。

我会建议不同的方法（使用ImageResizer NuGet包）：

var j = new ImageJob(fuSample,"~/imgs/users/<guid>.<ext>", 
    new ResizeSettings("maxwidth=128;maxheight=128")); 
j.Build(); 
string imageUrl = PathUtils.GuessVirtualPath(j.FinalPath)

来源

2013-05-30 14:57:57

上传，重命名和调整图像大小时出现ASP.NET错误

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