Question

我必须为我的网站实现一个功能，当我使用网站上的导出按钮时，该功能可以从预订列表中创建一个Json文件并下载。而且我不知道那是如何工作的^^ The Website Looks like this:

直到现在我只有以下代码：

[HttpGet]
    public IActionResult Export()
    {
        var bookings = _cache.GetOrCreate(BookingsCacheKey, BookingListFactory);
        string output = JsonConvert.SerializeObject(bookings);
        return View("Index");
    }

将预订保存在称为预订的IList中。并将列表保存在缓存中。

寻求帮助：）

Answer 1

u可以通过Ok响应返回对象

[HttpGet]
public IActionResult Export()
{
    var bookings = _cache.GetOrCreate(BookingsCacheKey, BookingListFactory);
    string output = JsonConvert.SerializeObject(bookings);

    byte[] bytes = System.Text.Encoding.UTF8.GetBytes(output);
    var output = new FileContentResult(bytes, "application/octet-stream");
    output.FileDownloadName = "download.txt";

    return output;
}

看看This post

Answer 2

如果将文件保存在服务器文件夹中，则可以将其用作可下载文件。

示例：

var test = new
{
    Id = 0,
    contains = "Test"
};//Save the file
string json = JsonConvert.SerializeObject(test);
System.IO.File.WriteAllText(@"wwwroot\\json\\test.json", json);


string fileName = "test.json";//Find the file in the path
var path = Path.Combine(Directory.GetCurrentDirectory(), @"wwwroot\\json\\", fileName);
var memory = new MemoryStream();
using (var stream = new FileStream(path, FileMode.Open))
{
    await stream.CopyToAsync(memory);
}
memory.Position = 0;//Return file with donwload
return File(memory, GetContentType(path), Path.GetFileName(path));

GetContentType和GetMimeTypes辅助方法：

private string GetContentType(string path)
{
    var types = GetMimeTypes();
    var ext = Path.GetExtension(path).ToLowerInvariant();
    return types[ext];
}

private Dictionary<string, string> GetMimeTypes()
{
    return new Dictionary<string, string>
    {
        {".json", "application/json"}

     };
}

从网站内容创建Json文件并下载

2 个答案: