前端PostJosn,后端转化相应的类

/// <summary>
    /// JsonPost特性类
    /// </summary>
    [AttributeUsage(AttributeTargets.Method, Inherited = true, AllowMultiple = true)]
    public class JsonPostAttribute : ActionFilterAttribute
    {
        /// <summary>
        /// 类型
        /// </summary>
        public Type ParamType { get; set; }

        /// <summary>
        /// .ctor
        /// </summary>
        public JsonPostAttribute(Type paramType)
        {
            ParamType = paramType;
        }

        /// <summary>
        /// .ctor
        /// </summary>
        public JsonPostAttribute()
        {

        }

        /// <summary>
        /// Action执行前过滤器
        /// </summary>
        /// <param name="filterContext"></param>
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            using (System.IO.StreamReader sr = new System.IO.StreamReader(filterContext.HttpContext.Request.InputStream,
                    System.Text.Encoding.GetEncoding("utf-8")))
            {
                var data = sr.ReadToEnd();
                var methodInfo = ((ReflectedActionDescriptor)filterContext.ActionDescriptor).MethodInfo;
                if (ParamType == null)
                {
                    foreach (var p in methodInfo.GetParameters())
                    {
                        ParamType = p.ParameterType;
                        break;
                    }
                }

                if (ParamType != null)
                {
                    var callback = data.ToInstance(ParamType);
                    foreach (var p in methodInfo.GetParameters())
                    {
                        if (p.ParameterType.FullName == ParamType.FullName)
                        {
                            filterContext.ActionParameters[p.Name] = callback;
                            break;
                        }
                    }
                }
            }
        }
    }

调用 方式

        [JsonPost]
        public JsonResult Create(CreateOrUpdateOrderReq req)
        {            

            return req!=null && req.Id>;
        }

前端Post

{"Id":1}

另一种实现

客户端调用时 header 里 添加

Content-Type: application/json;charset=UTF-8

则MVC会自动解析