如何使用C＃在ASP.NET MVC中下载文件？

Question

我正在做一项作业，并且停留在下载部分。 我可以上传文件。 但是，当我尝试在上传后下载同一文件时，出现错误（“访问被拒绝”）。

这是我编写的代码：

[HttpGet]
public FileResult Download (string fileName)
{
    var permissionSet = new PermissionSet(PermissionState.None);

    var writePermission = new FileIOPermission(FileIOPermissionAccess.Write, @"D:\Assignment\Ment\Ment\Photos");
    permissionSet.AddPermission(writePermission);

    var FileVirtualPath = Server.MapPath("~/Photos/" + fileName); //"~/Photos/" + fileName;

    return new FilePathResult(@"D:\Assignment\Ment\Ment\Photos", "application/octet-stream");
}

Answer 1

试试这样的事情：

public FileResult Download(string ImageName)
{
    return File(“<your path>” + ImageName, System.Net.Mime.MediaTypeNames.Application.Octet);
}

另外，请访问此链接：

ASP.NET MVC上载和下载文件

使用ASP.NET MVC上传和下载文件

Answer 2

你可以做

[HttpGet]
    public virtual ActionResult Download(string fileName)
    {
        //fileName should be like "photo.jpg"
        string fullPath = Path.Combine(Server.MapPath("~/Photos"),fileName);
        return File(fullPath, "application/octet-stream", fileName);
    }