c# - 如何上传 pdf 文件？

Question

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。谁能帮我解决这个问题？

 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";
 }

Answer 1

您应该重构您的代码，以便它可以准确地告诉您上传有什么问题。像这样:

 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.";
 }

我的猜测是浏览器没有提供正确的内容/类型。尝试上面的代码并告诉我们您收到的消息。