IIS 中的 Blazor 服务器端下载问题

问题描述

我正在尝试下载文件列表（用户可以选择多个）。我下面的当前代码在 localhost 中运行良好（编写和打开下载文件夹）。但是，当我上传到 IIS 时，它给出了一个错误，说找不到系统配置。 请参阅以下内容：

if (SelectDownloadFiles.Count > 0)
{
    //Downloads folder (User profile)
    string DownloadFolder = Environment.ExpandEnvironmentvariables("%userprofile%/downloads/");

    //This is a little hack to get the literal path for the Downloads folder without too much of back-and-forth and ellaboration
    string FolderForward = DownloadFolder.Replace(@"/",@"\");
    string Folder = FolderForward.Replace(@"\\",@"\");

    foreach (var items in SelectDownloadFiles)
    {
        //Get Date
        var GetDate = items.Substring(0,6);

        //Add 2 days to be consistent to what is displayed to the user (when files were generated)
        var FileDate = DateTime.ParseExact(GetDate,"yyMMdd",CultureInfo.InvariantCulture).AddDays(2);

        //Get Files
        string Pathname = @"D:\";
        string FullPathName = Path.Combine(Pathname,items);
        byte[] FileBytes = System.IO.File.ReadAllBytes(FullPathName);
        MemoryStream Ms = new MemoryStream(FileBytes);

        //Rename the file to become user friendly
        string Downloadpath = Path.Combine(DownloadFolder,"My Files " + FileDate.ToString("MM-dd-yyyy") + ".zip");

        //Write file(s) to folder
        FileStream File = new FileStream(Downloadpath,FileMode.Create,FileAccess.Write);
        Ms.Writeto(File);
        File.Close();
        Ms.Close();
    }

    //Open Downloads Folder with files
    Process.Start("explorer.exe",Folder);
    navigationManager.Navigateto("/default",true);

    //displayMessage.Show("File(s) successfully downloaded. Please check your “Downloads” folder to access your file(s).","OK","check");
}
else
{
    Toaster.Add("Please select at least one file to download.",MatToastType.Warning);
}

我也尝试使用以下解决方案无济于事：

 private readonly IWebHostEnvironment _webHostEnvironment;

    public YourController (IWebHostEnvironment webHostEnvironment)
    {
        _webHostEnvironment= webHostEnvironment;
    }

例如，如果我使用“folderoptionpath”并选择“MyDocuments”，文件将下载到 IIS 中文件的根路径。 我还需要做些什么才能让它发挥作用？ 提前致谢！

解决方法

好吧，在花了一些时间研究这个之后，我终于能够开始了。我最终使用了一个名为 BlazorFileSaver 的 Nuget 包，它工作得很好。这是回购：https://github.com/IvanJosipovic/BlazorFileSaver/blob/master/src/BlazorFileSaver.Sample/Pages/Index.razor 我希望这可以在未来帮助其他人。