实体框架中的数据注释不起作用 [英] Data annotation in Entity Framework does not work

问题描述

我已经在实体框架的edmx文件后面的代码中使用了数据验证，如下所示:
[Range(1，5，ErrorMessage =输入1到5之间的值")]

Hi,

I have used a data validation in the code behind of edmx file of entity framework as:
[Range(1, 5, ErrorMessage = "Enter a value between 1 and 5")]

public global::System.Decimal UnitPrice
        {
            get
            {
                return _UnitPrice;
            }
            set
            {
                OnUnitPriceChanging(value);
                ReportPropertyChanging("UnitPrice");
                _UnitPrice = StructuralObject.SetValidValue(value);
                ReportPropertyChanged("UnitPrice");
                OnUnitPriceChanged();
            }
        }

当我在使用方应用程序上使用此实体时，它将不检查范围验证.

When I use this entity on consuming application then it does not check the range validation.

推荐答案

要实现此目的，您必须为中的每个实体类创建一个第二部分类EF并将其链接到具有替代属性的辅助类.

例如，您有一个生成的

To achieve this you have to create a 2nd partial class for each entity class in EF and link it to a auxiliary class with substitute properties.

for example you have a generated

class Product { public int UnitPrice{ get; set; } }

生成的类将始终标记为局部类.

现在您必须创建第二个部分类文件并添加

The generated class will always be marked as partial.

and now you have to create 2nd partial class file and add

[MetadataType(typeof(ProductMetadata))]
public partial class Product 
{
    // it's possible to add logic and non-mapped properties here
}


public class ProductMetadata
{
   [Range(1, 5, ErrorMessage = "Enter a value between 1 and 5")]
    public int UnitPrice { get; set; }   // note the 'object' type
}

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