asp.net/HTML 文件上传控件未按预期上传多个文件

Question

我正在使用 asp.net 文件控制。我正在上传多个文件。问题是当我选择两个或多个文件时，它只会多次上传一个文件。我的意思是，如果我选择两张不同的图片，它将两次上传第一张图片。如果我选择三张图片，那么它将上传第一张图片三次。

我的文件上传控件如下，

<asp:FileUpload  runat="server" ID="file" multiple />

我的服务器端代码如下

    protected void click(object sender, EventArgs e) {
    foreach (string s in Request.Files)
    {
        HttpPostedFile file = Request.Files[s];

        int fileSizeInBytes = file.ContentLength;
        string fileName = Request.Headers["X-File-Name"];
        string fileExtension = "";

        if (!string.IsNullOrEmpty(fileName))
            fileExtension = Path.GetExtension(fileName);

        // IMPORTANT! Make sure to validate uploaded file contents, size, etc. to prevent scripts being uploaded into your web app directory
        string savedFileName = Path.Combine(@"D:\Temp\", Guid.NewGuid().ToString() + ".jpg");
        file.SaveAs(savedFileName);
    }
}

我不知道为什么会这样。当我调试服务器端代码时，它为我提供了与“Request.Headers [”X-File-Name“]”不同的文件名称，但不知何故它正在上传相同的内容（我尝试上传的多个图像中的第一个图像）

Answer 1

如果您像这样使用 ASP.NET > 4.0，则可以从文件上传控件中获取发布的文件

foreach (HttpPostedFile f in file.PostedFiles)
        { 
        //HttpPostedFile file = Request.Files[s];

        int fileSizeInBytes = f.ContentLength;
        string fileName = f.FileName;
        string fileExtension = "";

        if (!string.IsNullOrEmpty(fileName))
            fileExtension = Path.GetExtension(fileName);

        // IMPORTANT! Make sure to validate uploaded file contents, size, etc. to prevent scripts being uploaded into your web app directory
        string savedFileName = Path.Combine(@"D:\Temp\", Guid.NewGuid().ToString() + ".jpg");
        f.SaveAs(savedFileName);
    }

使用 ASP.NET 4.0 或更低版本也可用于 4.0 及更高版本

HttpFileCollection fc = Request.Files;

    for (int i = 0; i < fc.Count; i++)
    {
        HttpPostedFile f = fc[i];
        int fileSizeInBytes = f.ContentLength;
        string fileName = f.FileName;
        string fileExtension = "";

        if (!string.IsNullOrEmpty(fileName))
            fileExtension = Path.GetExtension(fileName);

        // IMPORTANT! Make sure to validate uploaded file contents, size, etc. to prevent scripts being uploaded into your web app directory
        string savedFileName = Path.Combine(@"D:\Temp\", Guid.NewGuid().ToString() + ".jpg");
        f.SaveAs(savedFileName);
    }