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

Question

我尝试使用WebClient将数据发送到WebAPI。运行我的代码给出了标题中显示的例外。有人可以帮我吗？

在这里，我的代码的一部分带有标题定义

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;
}

Answer 2

设置内容长度属性和" contentlength"通过如下代码中将其添加到WebClient标题中。

using (WebClient wc = new WebClient())
{
    wc.Headers[HttpRequestHeader.ContentType] = "application/json";
    -
    -
    -
    //wc.Headers[HttpRequestHeader.ContentLength] = contentLength;
    wc.Headers.Add("Content-Length", 0); //if there is no request body to be sent
          or 
    wc.Headers.Add("Content-Length", data.length.ToString());
    -
    -
    -
    -
    byte[] htmlResult = wc.UploadData(URI, "POST", data);