c#上传文件并限制上传文件类型

最新推荐文章于 2022-02-20 20:28:52 发布

转载最新推荐文章于 2022-02-20 20:28:52 发布 · 4.2k 阅读

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#c# #extension #file #server #upload #button

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本文展示了一个使用ASP.NET进行文件上传的例子，包括了如何验证文件类型及保存上传文件到服务器的具体实现。

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<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

<script runat="server" >

    protected void UploadBtn_Click(object sender, EventArgs e)
    {
        // Specify the path on the server to
        // save the uploaded file to.
        string savePath = @"c:/temp/uploads" ;

        // Before attempting to save the file, verify
        // that the FileUpload control contains a file.
        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 == ".doc" ) | (extension == ".xls" ))
            {
                // Append the name of the file to upload to the path.
                savePath += fileName;

                // Call the SaveAs method to save the
                // uploaded file to the specified path.
                // This example does not perform all
                // the necessary error checking.
                // If a file with the same name
                // already exists in the specified path,
                // the uploaded file overwrites it.
                FileUpload1.SaveAs(savePath);

                // Notify the user that their file was successfully uploaded.
                UploadStatusLabel.Text = "Your file was uploaded successfully." ;
            }
            else
            {
                // Notify the user why their file was not uploaded.
                UploadStatusLabel.Text = "Your file was not uploaded because " +
                                         "it does not have a .doc or .xls extension." ; } } } </script> <html > <head runat="server" >
    <title>FileUpload Class Example</title>
</head>
<body>
    <form id="form1" runat="server" >
    <div>
        <h4>Select a file to upload:</h4>

        <asp:FileUpload id="FileUpload1"
            runat="server" >
        </asp:FileUpload>

        <br/><br/>

        <asp:Button id="UploadBtn"
            Text="Upload file"
            OnClick="UploadBtn_Click"
            runat="server" >
        </asp:Button>

        <hr />

        <asp:Label id="UploadStatusLabel"
            runat="server" >
        </asp:Label>
    </div>
    </form>
</body>
</html>