Question

C#怎么使用HttpClient来Post数据

Answer 1

public static string PostRequest(string url, Encoding encoding, Dictionary<string, object> input = null)
{
    var request = WebRequest.Create(new Uri(url));
    request.Method = System.Net.WebRequestMethods.Http.Post;
    request.ContentType = "application/x-www-form-urlencoded";
    if (input != null)
    {
        var builder = new StringBuilder();
        foreach (var item in input)
        {
            var value = HttpUtility.UrlEncode(item.Value.ToString(), encoding);
                    builder.AppendFormat("{0}={1}&", item.Key, value);
                }
                var bytesForArray = encoding.GetBytes(builder.ToString());
                request.ContentLength = bytesForArray.Length;
                var stream = request.GetRequestStream();
                stream.Write(bytesForArray, 0, bytesForArray.Length);
                stream.Close();
            }
            var response = request.GetResponse();
            var list = new List<byte>();
            var buffer = new byte[1024];
            int len = 0;
            var rStream = response.GetResponseStream();
            while ((len = rStream.Read(buffer, 0, buffer.Length)) > 0)
            {
                list.AddRange(buffer.Take(len));
            }
            response.Close();
            return encoding.GetString(list.ToArray());
}