回发后没有获得FileUpLoad的值 [英] not getting value of FileUpLoad after postback

问题描述

大家好，



i有FileUpLoad控件和按钮控件（UpLoadButton）。我已经遇到问题，就像FileUpLoad包含文件路径一样，它显示为null在postBack或UpLoadButton点击后。



我使用了以下代码：

hi all,

i have FileUpLoad Control and Button control (UpLoadButton).I''ve facing problem like though FileUpLoad containg file path,it is showing null once after postBack or UpLoadButton clicked.

i''ve used following code:

protected void btn_UpLoadButton_Click(object sender, EventArgs e)
{

  if (FileUpload1.PostedFile.FileName!= null)//here is my doubt that showing Null Value though it''s filled
  {
     HttpPostedFile File1 = FileUpload1.PostedFile;
     Data = new byte[File1.ContentLength];
     File1.InputStream.Read(Data, 0, File1.ContentLength);
     //  Session["ScannedPhotoData"] = Data;

     string strFilename = getFilename(FileUpload1.PostedFile.FileName);
     string strFilepath = "ImageFolder\\" + strFilename;
     string Photo = Server.MapPath(strFilepath);
     //if (File.Exists(Photo))
     //    File.Delete(Photo);
     FileUpload1.PostedFile.SaveAs(Photo);
     ImgScannedPhoto.ImageUrl = "imageview.aspx?img=" + Photo;
     //ScannedPhotoPath.Text = Photo;
  }
}

请回复谢谢

please reply thanks

推荐答案

你不能保留FileUpload控件中的值。这是出于安全原因。你可以使用RequiredFieldValidator作为keyname文本框。

You can''t retain value in FileUpload control. This is because of security reasons. you can use RequiredFieldValidator for keyname textbox.

尝试将值保存到会话变量或隐藏字段以保存数据。看看这篇文章。



http://www.ironspeed.com/articles /Maintain%20File%20Upload%20Control/Article.aspx [ ^ ]

Try saving the value to a session variable or a hidden field to preserve the data.Have a look at this article.

http://www.ironspeed.com/articles/Maintain%20File%20Upload%20Control/Article.aspx[^]

if (Fup1.HasFile)
{
    string FilePath = "";
    string[] a = new string[1];
    string fileName = "";
    string FullName = "";
    try
    {
        if (Fup1.FileName.Length > 0)
        {
            a = Fup1.FileName.Split(''.'');
            fileName = Convert.ToString(System.DateTime.Now.Ticks) + "." + a.GetValue(1).ToString();
            FilePath = Server.MapPath(@"~\FolderName");
            Fup1.SaveAs(FilePath + @"\" + fileName);

            FullName = FilePath + @"\" + fileName;
            // Database Save Operation of filename.

        }
    }
    catch
    {
    }
}

你可以试试这个。

如果没有解决此错误，请尝试， -

You can try with this.
If with this error is not solved then try,-

FileUploader.Atribute.add("Value",FileUploader.PostedFile); 

在PageLoad。



希望这可以帮到你。

In PageLoad.

Hope this can help you.

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