过滤文件上传控件的文件类型

本文介绍了过滤文件上传控件的文件类型的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

如何筛选在asp＆放文件上传控件的文件类型; C＃.NET

how to filter the file type with the file upload control in asp & c#

例如在点击文件上传控件的浏览按钮，就应该打开浏览文件对话框，只有excel文件类型。

for example on clicking the browse button of the file upload control ,it should open browse file dialog with only excel file types.

这怎么可能。

推荐答案

这是从其他论坛的答案

我觉得如果你使用C＃（或VB，净）和 FileUpload控件很容易去实现它。您可以在Ar​​rayList中allowedExtensions定义文件类型。

I think it 's easy to realise it if you use C# (or VB,net) and fileupload control. you may define file types in arraylist "allowedExtensions".

string upload_Image(FileUpload fileupload, string ImageSavedPath) { FileUpload fu = fileupload; string imagepath = ""; if (fileupload.HasFile) { string filepath = Server.MapPath(ImageSavedPath); String fileExtension = System.IO.Path.GetExtension(fu.FileName).ToLower(); String[] allowedExtensions = { ".gif", ".png", ".jpeg", ".jpg" }; for (int i = 0; i < allowedExtensions.Length; i++) { if (fileExtension == allowedExtensions[i]) { try { string s_newfilename = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + fileExtension; fu.PostedFile.SaveAs(filepath + s_newfilename); imagepath = ImageSavedPath + s_newfilename; } catch (Exception ex) { Response.Write("File could not be uploaded."); } } } } return imagepath; }