实体框架验证单元测试 [英] Unit testing for entity Framework validation

问题描述

我试图创建一个实体框架对象的验证单元测试。我发现此链接：
http://stackoverflow.com/a/11514648/2486661 但对我来说永远不会验证获得的价值假的。我使用在实体对象的属性数据的注释。为此，我创建元数据对象包括注释和批注这样的实体对象：

I am trying to create a unit test for the validation of an Entity Framework object. I found this link: http://stackoverflow.com/a/11514648/2486661 but the validation for me never get the value false. I am using data annotations in the properties of the entity object. For this I create a MetaData object for including the annotations and annotated the entity object like this:

[MetadataType(typeof(MyEntityObjectMetaData))]
public partial class MyEntityObject
{
}

我的验证注解是这样的：

My validation annotations are like this:

public class MyEntityObjectMetaData
{
    [StringLength(8, ErrorMessage = "Invalid Length for myProperty.")]
    public String myProperty { get; set; } 
}

而code的单元测试：

And the code for the unit test:

    [TestMethod]
    public void TestMethod1()
    {
        MyEntityObject myEntityObject = new MyEntityObject();

        myEntityObject.myProperty = "1234567890";

        var context = new ValidationContext(myEntityObject, null, null);
        var results = new List<ValidationResult>();

        var actual = Validator.TryValidateObject(myEntityObject, context, results);
        var expected = false;

        Assert.AreEqual(expected, actual);
    }

我不明白为什么对象的验证返回值true，如果我有属性值无效。感谢您的帮助。

I do not understand why the validation of the object return the value true if I have an invalid value for the property. Thanks for any help.

推荐答案

我使用的DbContext对象这样解决问题：

I resolve the problem using the DBContext object like this:

 MyEntityObject myEntityObject = new MyEntityObject();
 myEntityObject.myProperty = "1234567890";

var dbContext = new DbContext(MyEntityObject, true);

int errors = dbContext.GetValidationErrors().Count();

IEnumerable<DbEntityValidationResult> validationResults = 
                                         dbContext.GetValidationErrors();
DbValidationError validationError = validationResults.First().ValidationErrors.First();

Assert.AreEqual(1, errors);
Assert.AreEqual("myProperty", validationError.PropertyName);

MyEntityObject是ObjectContext类的子类，是实体框架自动生成。
我还是不明白，为什么使用Validator.TryValidateObject方法不起作用。

MyEntityObject is a subclass of ObjectContext class and is auto generated by the Entity Framework. I still don't understand why using the Validator.TryValidateObject method doesn't work.

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