c# – 如何上传pdf文件？

发布时间：2020-12-16 00:01:34 所属栏目：百科来源：网络整理

导读：我必须使用FileUpload控件在Web应用程序中上传.pdf文件.我试过这段代码,但它有一些问题.谁能帮我这个？ protected void Button1_Click(object sender,EventArgs e) { if (FileUpload1.HasFile) { if (FileUpload1.PostedFile.ContentType == ".pdf") { strin

我必须使用FileUpload控件在Web应用程序中上传.pdf文件.我试过这段代码,但它有一些问题.谁能帮我这个？

protected void Button1_Click(object sender,EventArgs e)
 {
      if (FileUpload1.HasFile)
      {
           if (FileUpload1.PostedFile.ContentType == ".pdf")
           {
                string path = Server.MapPath(".") + "" + FileUpload1.FileName;
                FileUpload1.PostedFile.SaveAs(path);
                Label6.Text = "File Uploaded Successfully...";
                StreamReader reader = new StreamReader(FileUpload1.FileContent);
                string text = reader.ReadToEnd();
           }
           else
                Label6.Text = "Upload .pdf File";
      }
      else
           Label6.Text = "Upload file";
 }

解决方法

您应该重新构建代码,以便它可以准确地告诉您上载的错误.像这样的东西：

protected void Button1_Click(object sender,EventArgs e)
 {
    Label6.Text = ProcessUploadedFile();
 }

 private string ProcessUploadedFile()
 {
    if(!FileUpload1.HasFile)
        return "You must select a valid file to upload.";

    if(FileUpload1.ContentLength == 0)
        return "You must select a non empty file to upload.";

    //As the input is external,always do case-insensitive comparison unless you actually care about the case.
    if(!FileUpload1.PostedFile.ContentType.Equals("application/pdf",StringComparison.OrdinalIgnoreCase))
        return "Only PDF files are supported. Uploaded File Type: " + FileUpload1.PostedFile.ContentType;

    //rest of the code to actually process file.

    return "File uploaded successfully.";
 }

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（编辑：李大同）

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