我尝试了一些代码来让您使用文件名获取文件扩展名

Hi,

I tried some code for you to get file extension by using filename

DirectoryInfo dinfo = new DirectoryInfo(Server.MapPath("~/Images"));
           FileInfo[] finfo = dinfo.GetFiles("winter.*");
           int l=finfo.Length;
           string ext=Path.GetExtension(finfo[0].FullName);

在这里，您必须传递文件名而不是"winter"

然后将文件信息存储在finfo数组中.

这样我们就可以得到该文件扩展名

我希望你能理解我说的话

***的

Here you''ve to pass your file name instead of "winter"

Then The file information stored in finfo array.

So we can get that file extension

I hope you understood What I said

All the Best

您的文件名"... \ Images \ 34"没有扩展名.

Your file name "...\Images\34" has no extension.

要获取文件扩展名，

To get File Extension,

Response.Write(Path.GetExtension(@"F:\Articles\ValidationControls\ValidationControls.zip"));

请参阅下面的链接

^ ]

Refer below link

http://codes.codedigest.com/CodeDigest/68-Get-File-Extension--File-Name--File-Name-without-Extension-from-Path-in-C--and-ASP-Net.aspx[^]