c#重定向post请求

Question

尝试使用第一个应用程序收到的相同Form Data参数从一个应用程序向另一个应用软件发出post请求。两个应用程序控制器目前都有相同的方法：

public async Task<ActionResult> TestSet()
{
var inputString = Request.Form["inputString"];
var inputFile = Request.Files[0];
var resultString = await _service.Set(inputString, inputFile.FileName, inputFile.ContentType, inputFile.InputStream);
return new MyJsonResult(new
{
fileName = resultString
});
}

返回json字符串：

{"fileName": "someFileName.png"}

试图使第一种方法成为类似的东西

public async Task<ActionResult> TestSet()
{
var inputString = Request.Form["inputString"];
var inputFile = Request.Files[0];
if (!string.IsNullOrEmpty(_redirectUrl))
{
using (var client = new HttpClient())
{
HttpContent content = GetContentSomehow(this.Request); // this i have an issue with
var response = await client.PostAsync(_redirectUrl, content);
var responseString = await response.Content.ReadAsStringAsync();
return new MyJsonResult(responseString);
}
}
var resultString = await _service.Set(inputString, inputFile.FileName, inputFile.ContentType, inputFile.InputStream);
return new MyJsonResult(new
{
fileName = resultString
});
}

这可能有助于仅获取文件的ByteArrayContent。

这可能会将非文件参数放入StringContent中，但如何将它们都放入单个Content中呢？

var jsonString = JsonConvert.SerializeObject(Request.Form.ToDictionary());
var content = new StringContent(jsonString, Encoding.UTF8, "application/json");

Answer 1

通过将StringContent和StreamContent合并到MultipartFormDataContent 中解决了此问题

public static MultipartFormDataContent GetMultipartFormData(HttpRequestBase req)
{
var formData = new MultipartFormDataContent();
//formData.Headers.ContentType.MediaType = "multipart/form-data";
foreach (var row in req.Form.ToDictionary())
{
formData.Add(new StringContent(row.Value), row.Key);
}
var file = req.Files[0];
StreamContent fileStreamContent = new StreamContent(file.InputStream);
fileStreamContent.Headers.ContentType = new MediaTypeHeaderValue(file.ContentType);
formData.Add(fileStreamContent, file.FileName, file.FileName);
return formData;
}