文件上传无效 [英] file upload not working

问题描述

大家好，



我正在处理文件上传，但我不知道为什么它没有拿任何文件。



i已经在asp.net页面添加了fileupload和上传按钮，



i选择一个文件n点击上传按钮，在按钮上我得到了fileone .hasfile为空。



我的代码：

  protected   void  btnupload_Click（ object  sender，EventArgs e） 
 {
  if （PhotoUpload1.HasFile）
 {
 Session [   ImageBytes] = PhotoUpload1.FileBytes; 
  string  str = Server.MapPath（PhotoUpload1.FileName）; 
 ImagePreview.ImageUrl =  〜/ DriverSetup / + PhotoUpload1.FileName; 
} 
 
} 

它不会进入if循环，只返回false;



plz建议我，



更新面板代码：

< pre lang =xml>< asp：UpdatePanel ID =UpdatePanel1runat =server> 
< ContentTemplate> 
< asp：Image CssClass =img img-thumbnailWidth =150pxHeight =180pxID =ImagePreviewrunat =server/> 
< br /> 
< asp：FileUpload ID =PhotoUpload1runat =server/> 
< br /> 
< asp：Button ID =btnuploadrunat =serverText =Upload
 onclick =btnupload_Click/> 
< asp：UpdateProgress ID =UpdateProgress1runat =server> 
< ProgressTemplate>请稍候...< / ProgressTemplate> 
< / asp：UpdateProgress> 
< / ContentTemplate> 
<触发器> 
< asp：PostBackTrigger ControlID =btnupload/> 
< /触发器> 
< / asp：UpdatePanel> 
 
< / pre> 

最佳问候

解决方案

试试这个

  protected   void  UploadButton_Click（ object  sender，EventArgs e）
 {
  if （FileUploadControl.HasFile）
 {
  try  
 {
  if （FileUploadControl.PostedFile.ContentType ==   image / jpeg）
 {
  if （FileUploadControl.PostedFile.ContentLength <   102400 ）
 {
  string  filename = Path.GetFileName（FileUploadControl.Fi leName）; 
 FileUploadControl.SaveAs（Server.MapPath（ 〜/）+ filename）; 
 StatusLabel.Text =  上传状态：文件已上传！; 
} 
  else  
 StatusLabel.Text =  上传状态：文件必须小于100 kb！; 
} 
  else  
 StatusLabel.Text =  上传状态：只接受JPEG文件！; 
} 
  catch （例外情况）
 {
 StatusLabel.Text =  上传状态：无法上传文件。出现以下错误： + ex.Message; 
} 
} 
} 

当我们将FileControl与UpdatePanel一起使用时，它是一个非常常见的问题。应该使用触发器。



参考



http://stackoverflow.com/questions/9682737/fileupload-hasfile-is-always-false [ ^ ]

在此添加您的更新面板，ASPX页面

 <  触发器 >  
 <   asp：PostBackTrigger     ControlID   =  btnupload    /  >  
 <   /触发器 >  
 <   / asp：UpdatePanel  > < /跨度> 

Hi guys,

I'm working on file upload, but i dont know why its not taking any files.

i have added fileupload in asp.net page with upload button,

i select one file n click upload button, on button its i get the fileone.hasfile as empty.

my code:

protected void btnupload_Click(object sender, EventArgs e)
        {
            if (PhotoUpload1.HasFile)
            {
                Session["ImageBytes"] = PhotoUpload1.FileBytes;
                string str = Server.MapPath(PhotoUpload1.FileName);
                ImagePreview.ImageUrl = "~/DriverSetup/" + PhotoUpload1.FileName;
            }

        }

its not going into if loop, just return false;

plz suggest me,

update panel code:

<pre lang="xml"><asp:UpdatePanel ID="UpdatePanel1" runat="server">
                                      <ContentTemplate>
                                      <asp:Image CssClass="img img-thumbnail" Width="150px" Height="180px" ID="ImagePreview" runat="server" />
                                      <br />
                                      <asp:FileUpload ID="PhotoUpload1" runat="server" />
                                       <br />
                                       <asp:Button ID="btnupload" runat="server" Text="Upload"
                                          onclick="btnupload_Click" />
                                          <asp:UpdateProgress ID="UpdateProgress1" runat="server">
                                          <ProgressTemplate>Please wait...</ProgressTemplate>
                                          </asp:UpdateProgress>
                                      </ContentTemplate>
                                      <Triggers>
                                      <asp:PostBackTrigger ControlID="btnupload" />
                                      </Triggers>
                                      </asp:UpdatePanel>

</pre>

best regards

解决方案

try this

protected void UploadButton_Click(object sender, EventArgs e)
{
    if(FileUploadControl.HasFile)
    {
        try
        {
            if(FileUploadControl.PostedFile.ContentType == "image/jpeg")
            {
                if(FileUploadControl.PostedFile.ContentLength < 102400)
                {
                    string filename = Path.GetFileName(FileUploadControl.FileName);
                    FileUploadControl.SaveAs(Server.MapPath("~/") + filename);
                    StatusLabel.Text = "Upload status: File uploaded!";
                }
                else
                    StatusLabel.Text = "Upload status: The file has to be less than 100 kb!";
            }
            else
                StatusLabel.Text = "Upload status: Only JPEG files are accepted!";
        }
        catch(Exception ex)
        {
            StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;
        }
    }
}

Its very common issue when we use FileControl with UpdatePanel. Should use Triggers.

Refer

http://stackoverflow.com/questions/9682737/fileupload-hasfile-is-always-false[^]

Add this in your update panel, ASPX page

<Triggers>
            <asp:PostBackTrigger ControlID="btnupload" />
        </Triggers>
    </asp:UpdatePanel>

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