我是一个有用的助手,可以翻译文本。
我有一个名为“产品”的实体,这是它声明的一部分:
[EdmEntityTypeAttribute(NamespaceName="NorthwindModel", Name="Product")]
[Serializable()]
[DataContractAttribute(IsReference=true)]
public partial class Product : EntityObject
{
#region Factory Method
/// <summary>
/// Create a new Product object.
/// </summary>
/// <param name="productID">Initial value of the ProductID property.</param>
/// <param name="productName">Initial value of the ProductName property.</param>
/// <param name="discontinued">Initial value of the Discontinued property.</param>
public static Product CreateProduct(global::System.Int32 productID, global::System.String productName, global::System.Boolean discontinued)
{
Product product = new Product();
product.ProductID = productID;
product.ProductName = productName;
product.Discontinued = discontinued;
return product;
}
#endregion
#region Primitive Properties
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int32 ProductID
{
get
{
return _ProductID;
}
set
{
if (_ProductID != value)
{
OnProductIDChanging(value);
ReportPropertyChanging("ProductID");
_ProductID = StructuralObject.SetValidValue(value);
ReportPropertyChanged("ProductID");
OnProductIDChanged();
}
}
}
private global::System.Int32 _ProductID;
partial void OnProductIDChanging(global::System.Int32 value);
partial void OnProductIDChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.String ProductName
{
get
{
return _ProductName;
}
set
{
OnProductNameChanging(value);
ReportPropertyChanging("ProductName");
_ProductName = StructuralObject.SetValidValue(value, false);
ReportPropertyChanged("ProductName");
OnProductNameChanged();
}
}
private global::System.String _ProductName;
partial void OnProductNameChanging(global::System.String value);
partial void OnProductNameChanged();
我希望为其属性添加数据注释。我在互联网上搜索,根据以下主题: 使用Entity Framework的DataAnnotations, 我这样创建一个部分类:
[MetadataType(typeof(PersonMetaData))]
public partial class Product
{
}
public class PersonMetaData
{
[Required(ErrorMessage = "nima", AllowEmptyStrings = false)]
public global::System.String ProductName { set; get; }
[Range(minimum: 10, maximum: 100, ErrorMessage = "NIIMMMAA")]
public global::System.Int32 ProductID { set; get; }
}
但是它没有运作。为了测试,我编写了以下代码:
using (NorthwindEntities ef=new NorthwindEntities())
{
Product p = new Product();
p.CategoryID = 0;
p.Discontinued = false;
p.ProductID = 1000;
p.ProductName = string.Empty;
p.QuantityPerUnit = "3";
p.SupplierID = 3;
p.UnitsInStock = 0;
p.UnitsOnOrder = 3;
var context = new ValidationContext(p, serviceProvider: null, items: null);
var results = new List<System.ComponentModel.DataAnnotations.ValidationResult>();
var isValid = Validator.TryValidateObject(p, context, results, true);
if (!isValid)
{
foreach (var validationResult in results)
{
Response.Write(validationResult.ErrorMessage);
}
}
}
但是
isValid
变量总是为“true”。我的错误在哪里?谢谢