如何上传pdf文件并检查其是否为pdf文件? [英] How to Upload pdf file and check if it s pdf file or not?

问题描述

如何上传.pdf文件，然后检查其是否为.pdf文件?
我在asp.net中使用上载控件，但是在上载任何一个文件时发生错误.
所以我需要用C#上传代码.

谢谢Advance ..

How to Upload .pdf file and then check if it s .pdf file or not?
I am using Upload control in asp.net but while I upload any one file error occurred.
so I need Upload coding in C#.

Thanks Advance..

推荐答案

在上传前只需检查扩展名即可.

Just check extension before uploading.

if (FileUpload1.HasFile)
        {
            // Get the name of the file to upload.
            string fileName = Server.HtmlEncode(FileUpload1.FileName);
            // Get the extension of the uploaded file.
            string extension = System.IO.Path.GetExtension(fileName);
            // Allow only files with .doc or .xls extensions
            // to be uploaded.
            if (extension == ".pdf") 
{
//upload accordingly
}
            }

很难在不采取任何措施的情况下证明代码中的错误是正确的，但是您可以浏览

Its very hard to justify what is error in your code without taking its snap but you can navigate this[^] link to know how to upload file[.pdf] with checking it in ASP.net.

使用FileUpload控件& RegularExpressionValidator进行验证.

Use FileUpload control &RegularExpressionValidator to validate.

<asp:FileUpload ID="flUpld" runat="server" />

                <asp:RegularExpressionValidator

                    id="RegularExpressionValidator1" runat="server"

                    ErrorMessage="Only PDF files are allowed!"

                    ValidationExpression="^(([a-zA-Z]:)|(\\{2}\w+)\

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