如何使用ASP.NET限制文件上载控件中的文件类型 [英] How to Restrict File Types in File Upload Control using ASP.NET

问题描述

我有一个形式的文件上载控件，它仅允许选择的文件类型.
我在页面的 button_click 事件中实现了此功能.

在网络配置中:

Hi,

I have a File Upload Control in a form and it allows only selected file types.
I implemented this on the button_click event of the page.

In web config:

<appSettings>
    <add key="FileSize" value="2097152"/>
    <add key="FileType" value=".txt,.xlsx,.xls,.docx,.doc,.ppt,.pptx,.pdf"/>
  </appSettings>

在 btnSubmit_Click()中:

In btnSubmit_Click():

string[] allowExtentions = (ConfigurationManager.AppSettings["FileType"]).Split(',');
if (allowExtentions.Contains(Path.GetExtension(FileUp.PostedFile.FileName)) || Path.GetExtension(FileUp.PostedFile.FileName) == "")
{
    //custom code
}

是否有其他方法可以实现文件上载控件的文件类型限制?请帮助
Cos，我希望它在页面的回发前检查.
在此实现中，它首先接受文件，然后在我不希望发回的帖子之后在标签上引发错误消息.

等待您的宝贵意见.

谢谢，
Phanindra Bitla

Is there any other way to implement the file type restrictions of File Upload Control ?? Please Help
Cos, I want it to check before postback of the page.
In this implementation, it accepts the file first and later throws an error message on a label after the post back which I don''t want.

Waiting for your valuable comments.

Thanks,
Phanindra Bitla

推荐答案

默认情况下，当打开选择文件窗口时，FileUpload控件没有属性来限制文件类型.但是，您可以在继续操作之前检查文件上传的扩展名.

源 [ ^ ]

By default the FileUpload control doesn''t have a property to restrict file types when the select file window is opened. However, you can check the file uploaded extension before continuing the process.

Source[^]

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