ASP.NET使用FileUpload上传文件

最新推荐文章于 2021-06-13 19:27:12 发布

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最新推荐文章于 2021-06-13 19:27:12 发布

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文章标签： asp.net button asp server input div

ASP.NET使用FileUpload上传文件

FileUpload 您需要亲自将 enctype="multipart/form-data" 添加到页面的 <form> 元素中

清单. FileUpload 控件生成的源代码

< HTML xmlns ="http://www.w3.org/1999/xHTML" >

< head >< title >

Upload Files

</ title ></ head >

< body >

< form name ="form1" method ="post" action ="MyFileUpload.ASPx"

id ="form1" enctype ="multipart/form-data" >

< div >

< input type ="hidden" name ="__VIEWSTATE" id ="__VIEWSTATE" value ="/wEPDwUJNDcxNTg5NDg3D2QWAgIEDxYCHgdlbmN0eXBlBRNtdWx0aXBhcnQvZm9yb

S1kYXRhZGQUQEUFMY1+/fp1mnrkbqmVNQIzFA==" />

</ div >

< div >

< input type ="file" name ="FileUpload1" id ="FileUpload1" />< br />

< br />

< input type ="submit" name ="Button1" value ="Upload File"

id ="Button1" /> < br />

< br />

< span id ="Label1" ></ span >

</ div >

< div >

< input type ="hidden" name ="__EVENTVALIDATION" id ="__EVENTVALIDATION"

value ="/wEWAgLB+7jIAwKM54rGBv2Iz6LxVY7jWec0gZMxnuaK2ufq" />

</ div ></ form >

</ body >

</ HTML >

确定可以上传：定位到保存上传的文件夹（用IE）——属性——安全——是否有ASPNET帐户没则加

去掉上传大小限制：在 web.config.comments 文件（可以在 C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/CONFIG 的 ASP.NET 2.0 配置文件夹中找到）或应用程序的 web.config 文件中进行一些改动
在 web.config.comments 文件中，查找一个名为 <executionTimeout>的节点
<httpRuntime
executionTimeout="110" 上传时间
maxRequestLength="4096" 大小
requestLengthDiskThreshold="80"
useFullyQualifiedRedirectUrl="false"
minFreeThreads="8"
minLocalRequestFreeThreads="4"
appRequestQueueLimit="5000"
enableKernelOutputCache="true"
enableVersionHeader="true"
requireRootedSaveASPath="true"
enable="true"
shutdownTimeout="90"
delayNotificationTimeout="5"
waitChangeNotification="0"
maxWaitChangeNotification="0"
enableHeaderChecking="true"
sendCacheControlHeader="true"
apartmentThreading="false" />
在 web.config.comments 文件中进行此改动会将该设置应用于服务器上的所有应用程序。如果要将该设置仅应用于正在使用的应用程序，则将该节点应用于应用程序的 web.config 文件，覆盖 web.config.comments 文件中的所有设置。请确保该节点位于配置文件中的 <system.web> 节点之间。

使用验证控件限制上传类型

< ASP:FileUpload ID = " FileUpload1 " runat = " server " />< br />

< br />

< ASP:Button ID = " Button1 " runat = " server " OnClick = " Button1_Click "

Text = " Upload File " /> < br />

< br />

< ASP:Label ID = " Label1 " runat = " server " ></ ASP:Label >

< ASP:RegularExpressionValidator

id = " RegularExpressionValidator1 " runat = " server "

ErrorMessage = " Only mp3, m3u or mpeg files are allowed! "

ValidationExpression = " ^(([a-zA-Z]:)|(/{2}w+)$?)(/(w[w].*))

+ (.mp3|.MP3|.mpeg|.MPEG|.m3u|.M3U)$ "

ControlToValidate = " FileUpload1 " ></ ASP:RegularExpressionValidator >

< br />

< ASP:RequiredFieldValidator

id = " RequiredFieldValidator1 " runat = " server "

ErrorMessage = " This is a required field! "

ControlToValidate = " FileUpload1 " ></ ASP:RequiredFieldValidator >

Protected Sub Button1_Click(ByVal sender As Object, _

ByVal e As System.EventArgs)

If FileUpload1.HasFile Then

Dim fileExt As String

fileExt = System.IO.Path.GetExtension(FileUpload1.FileName)

If (fileExt = ".mp3") Then

Try

FileUpload1.SaveAs("C:Uploads" & _

FileUpload1.FileName)

Label1.Text = "File name: " & _

FileUpload1.PostedFile.FileName & "" & _

"File Size: " & _

FileUpload1.PostedFile.ContentLength & " kb" & _

"Content type: " & _

FileUpload1.PostedFile.ContentType

Catch ex As Exception

Label1.Text = "ERROR: " & ex.Message.ToString()

End Try

Else

Label1.Text = "Only .mp3 files allowed!"

End If

Else

Label1.Text = "You have not specified a file."

End If

End Sub

检查服务器上的文件类型（C#）

    
      
      
       
       
        
        
        
        protected
        
         
        
        void
        
         Button1_Click(
        
        object
        
         sender, EventArgs e)
    
        
        ...
        
        {

        if (FileUpload1.HasFile)
        ...{
            string fileExt = 
               System.IO.Path.GetExtension(FileUpload1.FileName);

            if (fileExt == ".mp3")
            ...{
                try
                ...{
                    FileUpload1.SaveAs("C:/Uploads/" + 
                       FileUpload1.FileName);
                    Label1.Text = "File name: " +
                        FileUpload1.PostedFile.FileName + "" +
                        FileUpload1.PostedFile.ContentLength + " kb" +
                        "Content type: " +
                        FileUpload1.PostedFile.ContentType;
                }
                catch (Exception ex)
                ...{
                    Label1.Text = "ERROR: " + ex.Message.ToString();
                }
            }
            else
            ...{
                Label1.Text = "Only .mp3 files allowed!";
            }
        }
        else
        ...{
            Label1.Text = "You have not specified a file.";
        }
    }
        
        

       
       
      
      
同时上载多个文件

C#
       
       
        
        
         
         
         
         protected
         
          
         
         void
         
          Button1_Click(
         
         object
         
          sender, EventArgs e)

         
         ...
         
         {
   string filepath = "C:/Uploads";
   //HttpFileCollection类型   HttpFileCollection uploadedFiles = Request.Files;
    
   for (int i = 0; i < uploadedFiles.Count; i++)
   ...{    
      //HttpPostedFile类型      HttpPostedFile userPostedFile = uploadedFiles[i];
    
      try
      ...{    
         if (userPostedFile.ContentLength > 0 )
         ...{
            Label1.Text += "File #" + (i+1) + 
               "";
            Label1.Text += "File Content Type: " + 
               userPostedFile.ContentType + "";
            Label1.Text += "File Size: " + 
               userPostedFile.ContentLength + "kb";
            Label1.Text += "File Name: " + 
               userPostedFile.FileName + "";
    
            userPostedFile.SaveAs(filepath + "/" + 
               System.IO.Path.GetFileName(userPostedFile.FileName));
    
            Label1.Text += "Location where saved: " + 
               filepath + "/" + 
               System.IO.Path.GetFileName(userPostedFile.FileName) + 
               "
";
         }    
      } 
      catch (Exception Ex)
      ...{    
         Label1.Text += "Error: " + Ex.Message;    
      }    
   }    
}
         
         

        
        
       
       


            图 5. 一次将一个 ASP.NET 页上的三个文件上载到服务器
       
       

最后：此法缺少文件状态  有待改进！