MVC为什么不验证呢？

[不懂必须要问]

就算输入空，也不提示的。
怎么回事？
数据模型是生成的。EDMX

        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult Create(int categoryID, FormCollection form)
        {
            var model = Northwind.Categories.FirstOrDefault(c=>c.CategoryID == categoryID);
            if (model == null)
            {
                Categories categories = new Categories();
                UpdateModel(categories, new[] { "CategoryName", "Description" });
                Northwind.AddToCategories(categories);
                Northwind.SaveChanges();
                return RedirectToAction("Index");
            }
            else
                return RedirectToAction("Create");

        }

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<MyFirstMVC.Models.Categories>" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
	Create
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    <h2>Create</h2>
    <%= Html.ValidationSummary("Error!") %>
    <% using (Html.BeginForm()) {%>
        <fieldset>
            <legend>Fields</legend>
            
            <div class="editor-label">
                <%= Html.LabelFor(model => model.CategoryID) %>
            </div>
            <div class="editor-field">
                <%= Html.Hidden("CategoryID") %>
            </div>
            
            <div class="editor-label">
                <%= Html.LabelFor(model => model.CategoryName) %>
            </div>
            <div class="editor-field">
                <%= Html.TextBox("CategoryName") %>
                <%= Html.ValidationMessage("CategoryName", "*") %>
            </div>
            
            <div class="editor-label">
                <%= Html.LabelFor(model => model.Description) %>
            </div>
            <div class="editor-field">
                <%= Html.TextBox("Description") %>
                <%= Html.ValidationMessage("Description", "*") %>
            </div>
            
            <p>
                <input type="submit" value="Create" />
            </p>
        </fieldset>

    <% } %>

    <div>
        <%= Html.ActionLink("Back to List", "Index") %>
    </div>

</asp:Content>

[宝_爸]

Model上加验证了吗？

想这样的

[宝_爸]

可以读下这篇文章

ASP.NET MVC 2: Model Validation
http://weblogs.asp.net/scottgu/archive/2010/01/15/asp-net-mvc-2-model-validation.aspx

ScottGu可是个牛人。

[不懂必须要问]

[Quote=引用 1 楼 findcaiyzh 的回复:]
Model上加验证了吗？

想这样的
[/Quote]

大哥两个儿子啊！强啊。

我用生成的ADO.NET Entity Data Model。也需要写吗？写在那里？

[不懂必须要问]

ADO.NET Entity Data Model 已经自动生成模型了。

如何再添加验证呢？

[sunnydisk]

[Quote=引用 1 楼 findcaiyzh 的回复:]

Model上加验证了吗？

想这样的
[/Quote]

正解，这样可以用AJAX异步验证了。

[不懂必须要问]

public partial class Categories : global::System.Data.Objects.DataClasses.EntityObject
    {
        /// <summary>
        /// Create a new Categories object.
        /// </summary>
        /// <param name="categoryID">Initial value of CategoryID.</param>
        /// <param name="categoryName">Initial value of CategoryName.</param>
        public static Categories CreateCategories(int categoryID, string categoryName)
        {
            Categories categories = new Categories();
            categories.CategoryID = categoryID;
            categories.CategoryName = categoryName;
            return categories;
        }
        /// <summary>
        /// There are no comments for Property CategoryID in the schema.
        /// </summary>
        [global::System.Data.Objects.DataClasses.EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)]
        [global::System.Runtime.Serialization.DataMemberAttribute()]
        public int CategoryID
        {
            get
            {
                return this._CategoryID;
            }
            set
            {
                this.OnCategoryIDChanging(value);
                this.ReportPropertyChanging("CategoryID");
                this._CategoryID = global::System.Data.Objects.DataClasses.StructuralObject.SetValidValue(value);
                this.ReportPropertyChanged("CategoryID");
                this.OnCategoryIDChanged();
            }
        }
        private int _CategoryID;
        partial void OnCategoryIDChanging(int value);
        partial void OnCategoryIDChanged();
        /// <summary>
        /// There are no comments for Property CategoryName in the schema.
        /// </summary>
        [global::System.Data.Objects.DataClasses.EdmScalarPropertyAttribute(IsNullable=false)]
        [global::System.Runtime.Serialization.DataMemberAttribute()]
        [global::System.ComponentModel.DataAnnotations.Required(ErrorMessage="*")]
        public string CategoryName
        {
            get
            {
                return this._CategoryName;
            }
            set
            {
                this.OnCategoryNameChanging(value);
                this.ReportPropertyChanging("CategoryName");
                this._CategoryName = global::System.Data.Objects.DataClasses.StructuralObject.SetValidValue(value, false);
                this.ReportPropertyChanged("CategoryName");
                this.OnCategoryNameChanged();
            }
        }
        private string _CategoryName;
        partial void OnCategoryNameChanging(string value);
        partial void OnCategoryNameChanged();
        /// <summary>
        /// There are no comments for Property Description in the schema.
        /// </summary>
        [global::System.Data.Objects.DataClasses.EdmScalarPropertyAttribute()]
        [global::System.Runtime.Serialization.DataMemberAttribute()]
        [global::System.ComponentModel.DataAnnotations.Required(ErrorMessage = "*")]
        public string Description
        {
            get
            {
                return this._Description;
            }
            set
            {
                this.OnDescriptionChanging(value);
                this.ReportPropertyChanging("Description");
                this._Description = global::System.Data.Objects.DataClasses.StructuralObject.SetValidValue(value, true);
                this.ReportPropertyChanged("Description");
                this.OnDescriptionChanged();
            }
        }
        private string _Description;
        partial void OnDescriptionChanging(string value);
        partial void OnDescriptionChanged();
        /// <summary>
        /// There are no comments for Property Picture in the schema.
        /// </summary>
        [global::System.Data.Objects.DataClasses.EdmScalarPropertyAttribute()]
        [global::System.Runtime.Serialization.DataMemberAttribute()]
        public byte[] Picture
        {
            get
            {
                return global::System.Data.Objects.DataClasses.StructuralObject.GetValidValue(this._Picture);
            }
            set
            {
                this.OnPictureChanging(value);
                this.ReportPropertyChanging("Picture");
                this._Picture = global::System.Data.Objects.DataClasses.StructuralObject.SetValidValue(value, true);
                this.ReportPropertyChanged("Picture");
                this.OnPictureChanged();
            }
        }
        private byte[] _Picture;
        partial void OnPictureChanging(byte[] value);
        partial void OnPictureChanged();
        /// <summary>
        /// There are no comments for Products in the schema.
        /// </summary>
        [global::System.Data.Objects.DataClasses.EdmRelationshipNavigationPropertyAttribute("NorthwindModel", "FK_Products_Categories", "Products")]
        [global::System.Xml.Serialization.XmlIgnoreAttribute()]
        [global::System.Xml.Serialization.SoapIgnoreAttribute()]
        [global::System.Runtime.Serialization.DataMemberAttribute()]
        public global::System.Data.Objects.DataClasses.EntityCollection<Products> Products
        {
            get
            {
                return ((global::System.Data.Objects.DataClasses.IEntityWithRelationships)(this)).RelationshipManager.GetRelatedCollection<Products>("NorthwindModel.FK_Products_Categories", "Products");
            }
            set
            {
                if ((value != null))
                {
                    ((global::System.Data.Objects.DataClasses.IEntityWithRelationships)(this)).RelationshipManager.InitializeRelatedCollection<Products>("NorthwindModel.FK_Products_Categories", "Products", value);
                }
            }
        }
    }

[不懂必须要问]

自己创建一个MODEL，可以进行验证。但EF生成的怎么验证？

[不懂必须要问]

都不明白我问什么。

ADO.NET Entity Data Model这个已经生成类了，我再编写类的话不可能的了。

[无水的鱼]

你判断空的时候有可能它是undefined 所以你应该 if (model == null || model==undefined ) 你试下

[r01cn]

我感觉你还是要系统地学一学MVC。在MVC框架中，M（模型）是整个应用程序的核心，MVC应用程序的开发流程一般总是从模型设计开始的，我好象还没有碰到过像你这样，把EF生成的实体数据模型（Entity Data Model）来作为应用程序的模型来使用的。这恐怕也是你验证失效的主要原因。

[逍遥羽飞]

EF可以配合[MetadataType(typeof())] 属性来做验证