C# 使用MultipartFormDataContent与其他一些参数发布图像

我需要将一些数据发布到API，但我不确定将标题放在哪里。这是我的密码：

    private async Task<string> PostTest()
    {
        string boundary = "----CustomBoundary" + DateTime.Now.Ticks.ToString("x");
        string servResp = "";

        strURI = "www.something.."
        HttpClient httpClient = new HttpClient();

        httpClient.DefaultRequestHeaders.Remove("Content-Type");
        httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "multipart/form-data; boundary=" + boundary);

        using (var content = new MultipartFormDataContent(boundary))
        {
            content.Add(new StringContent("application/json"), "Expected-Response-Mime-Type");
            content.Add(new StringContent("en-US"), "language");
            content.Add(new StringContent("blue"), "color");
            content.Add(new StringContent("12/11/15"), "date");

            ImageForm.Headers.ContentType = new MediaTypeHeaderValue("image/jpg");
            content.Add(ImageForm, "myPic", MyFileName);

            HttpClientHandler handler = new HttpClientHandler();

            HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, strExpenseURL);
            request.Headers.ExpectContinue = false;
            request.Content = content;

            httpClient = new HttpClient(handler);

            HttpResponseMessage response = await httpClient.SendAsync(request);

            servResp = await response.Content.ReadAsStringAsync();
        }

        return servResp;
    }

我希望我的请求内容类型为：多部分/表单数据；边界=+边界

我的响应内容类型：application/json

这些是我设置这两个的正确位置吗？

试试：

HttpClient client = new HttpClient();
HttpMultipartFormDataContent multipart = new HttpMultipartFormDataContent();
multipart.Add(new HttpStringContent("Bob"), "name");
multipart.Add(new HttpStringContent("Hero"), "job", "foo.txt");
multipart.Add(new HttpBufferContent((new byte[] { 0x21, 0x22, 0x23, 0x24 }).AsBuffer()), "Thing3");
HttpResponseMessage response = await client.PostAsync(uri, multipart);

Debug.WriteLineresponse.Content

阅读更多信息。

尝试：

HttpClient client = new HttpClient();
HttpMultipartFormDataContent multipart = new HttpMultipartFormDataContent();
multipart.Add(new HttpStringContent("Bob"), "name");
multipart.Add(new HttpStringContent("Hero"), "job", "foo.txt");
multipart.Add(new HttpBufferContent((new byte[] { 0x21, 0x22, 0x23, 0x24 }).AsBuffer()), "Thing3");
HttpResponseMessage response = await client.PostAsync(uri, multipart);

Debug.WriteLineresponse.Content

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阅读更多信息。

将StringContent替换为HttpStringContent将StringContent替换为HttpStringContent