System.Net.WebRequest.GetRequestStreamAsync C# (CSharp) Method

        public virtual System.Threading.Tasks.Task<System.IO.Stream> GetRequestStreamAsync() { throw null; }
        public virtual System.Net.WebResponse GetResponse() { throw null; }

        /// <summary>
        /// 发送指定的 form data 数据。
        /// </summary>
        /// <param name="request">WebRequest 扩展实例</param>
        /// <param name="data">提交数据时所需要的数据。可使用 <code>new { name = "xxx" }</code> 匿名对象的形式提供。</param>
        /// <param name="encoding">对于提交的数据的编码格式。null表示使用默认的 UTF-8 编码格式。</param>
        /// <returns>当前 <see cref="WebRequest"/> 实例。</returns>
        /// <exception cref="System.ArgumentNullException">data</exception>
        public static async Task <WebResponse> PushDataAsync(this WebRequest request, object data, Encoding encoding = null)
        {
            if (data == null)
            {
                throw new ArgumentNullException(nameof(data));
            }


            var form_data = string.Empty;

            if (data.GetType() != typeof(string))
            {
                var properties = new Dictionary <string, string>();

                foreach (var propInfo in data.GetType().GetRuntimeProperties())
                {
                    properties.Add(propInfo.Name, propInfo.GetValue(data).ToString());
                }

                form_data = properties.Select(kvp => $"{kvp.Key}={kvp.Value}").Aggregate((prev, next) => $"{prev}&{next}");
            }
            else
            {
                form_data = data.ToString();
            }

            var buffer = form_data.ToBytes(encoding);

            using (var stream = await request.GetRequestStreamAsync())
            {
                stream.Write(buffer, 0, buffer.Length);
            }
            return(await request.GetResponseAsync());
        }