[英]How to submit a file and some other form content to Web API using C# HttpClient
I am trying to submit a file with some KeyValuePairs .(which is id in this case) using HttpClient in C#.我正在尝试使用 C# 中的 HttpClient 提交一个带有一些KeyValuePairs的文件(在这种情况下是 id)。 the File is being submitted but i cannot read the KeyValuePairs
文件正在提交,但我无法读取 KeyValuePairs
This is my controller.这是我的控制器。
[HttpPost]
public async Task<ActionResult> Index(HttpPostedFileBase File)
{
HttpClient client = new HttpClient();
client.BaseAddress = new Uri("http://localhost:65211/");
MultipartFormDataContent form = new MultipartFormDataContent();
//Here I am adding a file to a form
HttpContent content = new StringContent("fileToUpload");
form.Add(content, "fileToUpload");
var stream = File.InputStream;
content = new StreamContent(stream);
content.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data")
{
Name = "fileToUpload",
FileName = File.FileName
};
form.Add(content);
// and here i am adding a dictionary with one keyvaluepair
Dictionary<string, string> Parameters = new Dictionary<string, string>();
Parameters.Add("id", "3");
form.Add(new FormUrlEncodedContent(Parameters));
//this will hit the api
var response = await client.PostAsync("/api/Upload", form);
var k = response.Content.ReadAsStringAsync().Result;
return View();
}
This is the Api Code这是 Api 代码
[Route("api/Upload")]
[HttpPost]
// i have tested public async Task<HttpResponseMessage> Upload(string id) <= giving parameters. the api doesnt hit if i give any
public async Task<HttpResponseMessage> Upload()
{
var request = HttpContext.Current.Request;
HttpResponseMessage result = null;
if (request.Files.Count == 0)
{
result = Request.CreateResponse(HttpStatusCode.OK, "Ok");;
}
var postedFile = request.Files[0];
return Request.CreateResponse(HttpStatusCode.OK, "Ok");
}
I am able to read the file.我能够读取文件。 It gets submitted to the API.
它被提交给 API。 the problem is the "id" that i submitted as a keyvaluepair.
问题是我作为键值对提交的“id”。 I don't know how to read it.
我不知道怎么读。 If i pass parameters to the Api.
如果我将参数传递给 Api。 client returns the error "Not Found".
客户端返回错误“未找到”。
I finally was able to read both the file and the parameters I sent to the Web API.我终于能够读取我发送到 Web API 的文件和参数。 It was a simple implimentation with HttpContext.Current.Request
这是 HttpContext.Current.Request 的简单实现
This is how i modified the API code.这就是我修改 API 代码的方式。
[Route("api/Upload")]
[HttpPost]
// i have tested public async Task<HttpResponseMessage> Upload(string id) <= giving parameters. the api doesnt hit if i give any
public async Task<HttpResponseMessage> Upload()
{
var request = HttpContext.Current.Request;
var key = Request.Params["key"]; // **<- LOOK AT THIS HERE**
HttpResponseMessage result = null;
if (request.Files.Count == 0)
{
result = Request.CreateResponse(HttpStatusCode.OK, "Ok");;
}
var postedFile = request.Files[0];
return Request.CreateResponse(HttpStatusCode.OK, "Ok");
}
By using HttpContext.Current.Request.Params , I was able to read the other values from the api.通过使用HttpContext.Current.Request.Params ,我能够从 api 读取其他值。 Request.Files contains all the files and Request.Params contains all string parameters.
Request.Files 包含所有文件,Request.Params 包含所有字符串参数。
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