从asp.net core web api下载大文件到winforms抛出json长度值过大不支持

Question

从 ASP.Net Core Web API 下载大文件到 WinForms 时， n长度的 JSON 值太大，不支持。

在 WinForms 中：

Httpcontent httpdata = new StringContent(Jsoncpnvert.Serializeobject(inputmodel),encoding.utf8));

Httpclient client = new httpclient();
MultipartFormDataContent form = new MultipartFormDataContent();
form.add(httpdata,form);

try{
Var response = client.postasync(url,form). result;
Downloadmodel model = response.content.Readasasync<downloadmodel>(). result;

// Here 500 internal server error occurs

}

Server side :

[Httppost]
Public downloadreturnmodel download ()
{

Var httpdata = Request.form["data"];
// Do some process
Result is a downloadreturnmodel 
Return result; 
}

Answer 1

你应该返回一个文件：

[Route("api/[controller]")] 
public class DownloadController : Controller
{
    [HttpGet("{id}"]
    public async Task<IActionResult> Download(string id) 
    { // Do some process
        return File(stream, "application/octet-stream"); // returns a FileStreamResult
    }     
}