使用System.Web 中的模型绑定

　　　　需要用到这个是因为在asp.net Web Form 中使用ashx 的时候没有一个好的模型绑定.所以我找到了dll 中自带的.并且将他封装了一下

　　　　　　　　代码如下:

    public class ModelBinder
    {
        public static BinderResultModel<T> BindModel<T>() where T : new()
        {
            var dicState = new ModelStateDictionary();
            ModelBindingExecutionContext context = new ModelBindingExecutionContext(new HttpContextWrapper(HttpContext.Current), dicState);
            ModelBindingContext bindingContext = new ModelBindingContext()
            {
                ModelBinderProviders = ModelBinderProviders.Providers,
                ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => Activator.CreateInstance<T>(), typeof(T)),
                ModelState = dicState,
                ValueProvider = new NameValueCollectionValueProvider(context.HttpContext.Request.Params, CultureInfo.CurrentCulture),
                ValidateRequest = true,
            };
            bindingContext.ValidationNode.ValidateAllProperties = true;
            if (ModelBinders.Binders.DefaultBinder.BindModel(context, bindingContext))
            {
                return new BinderResultModel<T>((T)bindingContext.Model, dicState);
            }
            return BinderResultModel<T>.NULL;
        }
        public class BinderResultModel<T> where T : new()
        {
            public static BinderResultModel<T> NULL
            {
                get
                {
                    return new BinderResultModel<T>(default(T), null, "返回空对象");
                }
            }
            public bool IsValid { get; }
            public T Data { get; }
            public string ErrorMessage { get { return _errorMsg; } private set { _errorMsg = value; } }
            private ModelStateDictionary _modelStateDic;
            private string _errorMsg = string.Empty;
            #region 构造函数
            public BinderResultModel(T t, ModelStateDictionary modelStateDic)
            {
                IsValid = false;
                Data = t;
                _modelStateDic = modelStateDic;
                if (_modelStateDic != null)
                {
                    IsValid = _modelStateDic.IsValid;
                }
                _errorMsg = GetErrorMessage();
            }
            public BinderResultModel(T t, ModelStateDictionary modelStateDic, string errorMsg) : this(t, modelStateDic)
            {
                _errorMsg = errorMsg;
            }
            #endregion
            #region 私有函数

            private string GetErrorMessage()
            {
                if (_modelStateDic is null)
                {
                    return string.Empty;
                }
                StringBuilder builder = new StringBuilder();
                foreach (var state in _modelStateDic)
                {
                    foreach (var error in state.Value.Errors)
                    {
                        builder.Append(error.ErrorMessage);
                    }
                    builder.AppendLine();
                }
                return builder.ToString();
            }
            #endregion
        }
    }

　　测试时使用的类:

　　

    class Person
    {
        // [BindingBehavior(BindingBehavior.Never)]
        //[Required(ErrorMessage = "姓名为必填")]
        [Display(Name = "姓名")]
        [MinLength(20, ErrorMessage = "最小长度为20")]
        [RegularExpression("/^/d$/", ErrorMessage = "不满足正则表达式")]
        public string Name { get; set; }
        public int Age { get; set; }
        [BindingBehavior(BindingBehavior.Never)]//表示从不绑定此属性
        public List<int> List { get; set; }
        public Dictionary<string, string> Dics { get; set; }
        [Required(ErrorMessage = "ma为必须")]
        public Man ma { get; set; }
    }
    class Man
    {
        [Required(ErrorMessage = "666666666666")]
        public string MMM { get; set; }
    }

　使用方式:

            var result = ModelBinder.BindModel<Person>();
            if (result.IsValid)
            {
                //绑定成功,并且校验通过  dosomething
            }
            else
            {
                //do something
            }