C# 传输文件和写入文件

我使用TransmitFile和WriteFile来编写Excel文件，但任何人都不能正常工作 我的代码是：

// Get the Physical Path of the file(test.doc)
        string filepath = newFilePath;

        // Create New instance of FileInfo class to get the properties of the file being downloaded
        FileInfo file = new FileInfo(filepath);

        // Checking if file exists
        if (file.Exists)
        {
            // Clear the content of the response
            HttpContext.Current.Response.ClearContent();

            // LINE1: Add the file name and attachment, which will force the open/cance/save dialog to show, to the header
            HttpContext.Current.Response.AddHeader("Content-Disposition", String.Format("attachment; filename={0}", file.Name));


            // Add the file size into the response header
            HttpContext.Current.Response.AddHeader("Content-Length", file.Length.ToString());

            // Set the ContentType
            HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";

            // Write the file into the response (TransmitFile is for ASP.NET 2.0. In ASP.NET 1.1 you have to use WriteFile instead)
            HttpContext.Current.Response.TransmitFile(file.FullName);



        }


        FileStream sourceFile = new FileStream(file.FullName, FileMode.Open);
        float FileSize;
        FileSize = sourceFile.Length;
        byte[] getContent = new byte[(int)FileSize];
        sourceFile.Read(getContent, 0, (int)sourceFile.Length);
        sourceFile.Close();
        HttpContext.Current.Response.ClearContent();
        HttpContext.Current.Response.ClearHeaders();
        HttpContext.Current.Response.Buffer = true;
        HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
        HttpContext.Current.Response.AddHeader("Content-Length", getContent.Length.ToString());
        HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
        HttpContext.Current.Response.BinaryWrite(getContent);

---

我将把它简化为：

public ActionResult ExcelDoc(string newFilePath)
{
    string filepath = newFilePath;

    // Create New instance of FileInfo class to get the properties of the file being downloaded
    FileInfo file = new FileInfo(filepath);

    // Checking if file exists
    if (file.Exists)
    {
        var fileBytes = System.IO.File.ReadAllBytes(filepath);
        Response.AddHeader("Content-Disposition", String.Format("attachment; filename={0}", file.Name));
        return File(new MemoryStream(fileBytes), "application/vnd.ms-excel");
    }
    else
    {
        return Content("File does not exist");
    }
}

---

导致任何错误。发生了什么错误？我没有看到任何Excel文件可供下载尝试放置一个try and catch并查看是否有任何异常。如果它依赖于浏览器，则没有任何异常？在response.writefile之后，我想看看save对话框，为什么你会使用

float

作为文件大小？我想在类中使用此代码，我必须返回什么类型？file？我会让类返回一个字节数组。这真是一个设计决策。