如上图,vs2012+Entity Framework 如果对应的实体类(entity)字段没有添加属性[key],[Required] 会提示 :has not keys defined 下面这样是ok的。 public class MovieEntry { [Key] public int Id{get;set;} [Required] public string Topic { get; set; } public string direct { get; set; } public DateT...
One or more validation errors were detected during model generation: System.Data.Edm.EdmEntityType: : EntityType 'UserInfo' has no key defined. Define the key for this EntityType.System.Data.Edm.EdmEntitySet: EntityType: EntitySet �UserInfo� is based on type �UserInfo� that has no...
可以做主键的类型只有两种 ，Guid或者Int。
Entity Framework version Problem Entity Framework won't delete my entity from the database entity type has no key defined error - help please! Enum and [Display(Name = "")] enum args in controller action methods? Enum Display within View enum to convert int in c# MVC? EnumDropDownListFor ...
Use a C# attribute to indicate that an entity has no key An entity type can now be configured as having no key using the newKeylessAttribute. For example: Copy [Keyless]publicclassAddress{publicstringStreet {get;set; }publicstringCity {get;set; }publicintZip {get;set; } ...
To avoid manually editing the .edmx file in this case, modify your database schema so that each table has a primary key or so that one or more columns of each table or view is non-nullable or non-binary.Adding an Entity Key When No Key Is Inferred from a Table...
Code First Entity : The property is part of the object's key information and cannot be modified. Code First Entity Framework not creating tables in the database Code first, EntityType 'IdentityUserLogin' has no key defined. Column names in each table must be unique. Column name 'BackupFil...
在EntityFramework中,如需要添加查询提示需要自定义实现拦截器,但在EntityFramework Core中除了支持实现自定义拦截器外,还可以通过继承自对应类进行复写,那就是QuerySqlGenerator类,存在于命名空间【Microsoft.EntityFrameworkCore.Query】,在此类通过我们所写的表达式实现所有查询组合,比如我们需要用到的对表的设置,如下: ...
With the latest major release of Entity Framework, EF6, the Microsoft object-relational mapping (ORM) tool has reached new heights of “ninja-ness.” It’s no longer the country cousin to long-established .NET ORM tools. EF is all grown up, and it’s winning over former die-hards. ...
No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient'. Make sure the provider is registered in the 'entityFramework' section of the application config file. 以上错误是由于你在其它类库引用了EntityFramework.SqlServer.dll导致，但是...