标签: ef-code-first

因为数据库初始化失败,我不得不在不同的MVC 4代码第一技术教程之后停止在同一阶段.

使用连接

<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=aspnet-DbTestApp-20130205173443;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnet-DbTestApp-20130205173443.mdf" providerName="System.Data.SqlClient" />

我甚至无法创建或管理数据库,我希望从我的模型生成数据库

public class Category
    {
        public int Id { get; set; }

        [Required]
        [MinLength(4)]
        [MaxLength(64)]
        public string Name { get; set; }

        public virtual IEnumerable<Article> Articles { get; set; }
    }

    public class Article
    {
        public int Id { get; set; }

        public int CategoryId { get; set; }
        public virtual Category Category { get; set; }

        [Required]
        [MinLength(4)]
        [MaxLength(64)]
        public string Title { get; set; }

        [Required]
        [MinLength(16)] …

我正在尝试添加到MVC 4开箱即用的会员资格.

public ActionResult Register(RegisterModel model)
{
    if (ModelState.IsValid)
    {
        // Attempt to register the user
        try
        {
            WebSecurity.CreateUserAndAccount(model.UserName, model.Password, model.Mobile);
            //I added model.Mobile
            WebSecurity.Login(model.UserName, model.Password);
            return RedirectToAction("Index", "Home");
        }
        catch (MembershipCreateUserException e)
        {
            ModelState.AddModelError("", ErrorCodeToString(e.StatusCode));
        }
    }
}

我改变了模型

public class RegisterModel
{
    // Username and password methods

    public string Mobile { get; set; }
}

我还将它添加到UserProfile模型中.我收到一个SqlException,我只是没有看到连接.这似乎是一个简单的错误但是.设置DB Nvarchar(MAX)以尝试避免此错误.

Invalid column name 'Length' 

我正在用NUnit和Entity Framework编写一些UnitTests.如何从Entity Framework级别删除整个localdb数据库？

注意:我不想清除表的数据.我想删除整个数据库.

此外,我可以在我的应用程序工作目录中创建一个localdb文件,前提是尚未创建数据库:

string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "");
var testDbFileName = String.Format(@"UnitTestDB.mdf");
var testDbFileNameWithPath = path + @"\" + testDbFileName;

var connectionString =
String.Format(
    @"Data Source=(localdb)\V11.0;Initial Catalog={0};Integrated Security=True;AttachDBFilename={1};MultipleActiveResultSets=True",
    "UnitTestDB", testDbFileNameWithPath);

//Here would be the code passing connection string to DbContext and so on..

仅删除文件"UnitTestDB.mdf"是不够的.在SQL Management Studio中仍然有对db的引用

public virtual ICollection<Product> Products { get; set; }POCO课程的目的是什么？

public class Category
    {
        [ScaffoldColumn(false)]
        public int CategoryID { get; set; }

        [Required, StringLength(100), Display(Name = "Name")]
        public string CategoryName { get; set; }

        public virtual ICollection<Product> Products { get; set; }


    }

我有以下课程(过于简化):

public class Person
{
    public int ID { get; set; }
}
public class Content
{
    public int ID { get; set; }
}
public class Image : Content
{
    public bool Private { get; set; }
    public Person Author { get; set; }
}
public class Tag
{
    public int ID { get; set; }
    public Content Content { get; set; }
    public Person Person { get; set; }
}

我想获得所有Tags在Content是Image与Image …

我试图弄清楚如何使MVC脚手架使用复合/复合键.

我有下表:

public class Data
{
    [Key, Column(Order = 0)]
    [ForeignKey("Note")]
    [Display(Name = "Note id")]
    public int NoteId { get; set; }

    [Key, Column(Order = 1)]
    [ForeignKey("Member")]
    [Display(Name = "Member id")]
    public int MemberId { get; set; }

    [Display(Name = "Description")]
    public string Description { get; set; }

    [Display(Name = "Note")]
    public virtual Note Note { get; set; }

    [Display(Name = "Member")]
    public virtual Member Member { get; set; }
}

当我执行脚手架的行时:

Scaffold Controller Data -Repository

我收到以下错误:

Get-PrimaryKey : Cannot …

我有一种奇怪的行为.我想更新复杂类型的单个属性.当我指定要使用IsModified更新的属性(某些属性为true而某些属性为false)时,我没有更新任何内容.如果我没有指定复杂类型的属性,则更新复杂属性的每个字段.

public class MyEntity
{
    public MyComplexClass Property1 { get; set; }
}

//... The code below doesn't work, in fact it update nothing
var entityLocal = this.Set<MyEntity>().Local.SingleOrDefault(d => d.Id == entity.Id);
if (entityLocal == null)
{
   entityLocal = this.Set<MyEntity>().Attach(entity);
}
this.ChangeTracker.Entries<MyEntity>().Single(d => d.Entity == entityLocal).State = EntityState.Modified;
this.Entry(entity).Property(s => s.Property1.SubProperty1).IsModified = true;
this.Entry(entity).Property(s => s.Property1.SubProperty2).IsModified = false;//This seam to remove all update of the complex type...?
this.SaveChanges();

这产生:

update [dbo].[MyEntity]
set @p = 0
where (([Id] = @0))

如果我没有将SubMperty2的IsModified指定为false,我在SQL事件探查器中有以下内容: …

这是基于Programming Code First EF的示例.

请看下面的课程.当PersonRepository调用实例化时,调用InsertOrUpdate方法返回Null值.据我所知,IQuariable的FitstOrDefault不应该返回Null.

这里有什么问题.谢谢您的帮助

    public class Person
{

    public int PersonId { get; set; }
    public int SocialSecurityNumber { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    //public int MyProperty { get; set; }
    public List<Lodging> PrimaryContactFor { get; set; }
    public List<Lodging> SecondaryContactFor { get; set; }

    public PersonPhoto Photo { get; set; }
}

照片类

    public class PersonPhoto
{
    public int PersonID { get; set; }
    public …

考虑一个包含三个行的名称的数据库表:

SubjectID      StudentName
---------      -------------
 1             Peter
 2             Paul
 2             Mary

有没有一种简单的方法可以将其转换为实体框架中的单个字符串？这样的事情:

SubjectID       StudentName
----------      -------------
1               Peter
2               Paul, Mary

查看此链接以获取更多信息.

我有以下实体:

public class Module
{
    public Module()
    {
        SubModules = new List<Module>();
    }

    public int Id { get; set; }
    public string Title { get; set; }
    public string Action { get; set; }
    public string Controller { get; set; }
    public string Icon { get; set; }

    public List<Module> SubModules { get; set; }
}

其中,当通过Code First初始化时,生成下表Schema:

CREATE TABLE [dbo].[Modules](
    [Id] [int] IDENTITY(1,1) NOT NULL,
    [Title] [nvarchar](max) NULL,
    [Action] [nvarchar](max) NULL,
    [Controller] [nvarchar](max) NULL,
    [Icon] [nvarchar](max) NULL,
    [Module_Id] [int] …