webclient - 必须使用适当的属性或方法修改 'Content-Length' header 。参数名称 : name

Question

我尝试使用 WebClient 将数据发送到 Web api。
运行我的代码会出现标题中显示的异常。
有人能帮我吗？
这是我的代码的一部分，带有 Header Definition

using (WebClient wc = new WebClient())
            {
                wc.Headers[HttpRequestHeader.ContentType] = "application/json";
                wc.Headers[HttpRequestHeader.Authorization] = headerString;

                data = Encoding.UTF8.GetBytes(jsonData);
                string contentLength = data.Length.ToString();

                wc.Headers[HttpRequestHeader.ContentLength] = contentLength;
                wc.Headers[HttpRequestHeader.Accept] = "application/json";

                wrCache = new CredentialCache();
                wrCache.Add(new Uri(URI), "Basic", new NetworkCredential("user1", "f_k@1F7"));

                wc.Credentials = wrCache;


                byte[] htmlResult = wc.UploadData(URI, "POST", data);

Answer 1

您可以使用 HttpWebRequest .例如:

private static HttpStatusCode UploadSharepointFile(string fileName)
{
        // Read file from path
        byte[] buffer = File.ReadAllBytes(fileName);

        HttpWebRequest http =
            WebRequest.CreateHttp($"https://google.com");

        http.Method = "POST";

        http.Credentials = (ICredentials) Program.cred;

        http.Headers.Add("Accept", "application/json");
        http.ContentLength = buffer.Length;
        http.GetRequestStream().Write(buffer, 0, buffer.Length);

        HttpWebResponse response = (HttpWebResponse) http.GetResponse();
        return response.StatusCode;
}