反序列化客户端Post传递的Json对象

    public static class HttpRequestExtension
    {
        /// <summary>
        /// 依据Request Body构建指定的实体类型
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        public static T ReadEntity<T>(this HttpRequestBase request) where T : class
        {
            if (request.InputStream.Length == 0) throw new Exception("request body must be not null");

            try
            {
                DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(T));
                request.InputStream.Position = 0;
                return jsonSerializer.ReadObject(request.InputStream) as T;
            }
            catch (SerializationException)
            {
                return null;
            }
        }
    }