EF通用存储库从新插入的通用实体获取Id

这其实非常简单;

// Project is is object/table, no POCO here.

var newProj = new Project();
newProj.Name = "Blah project";

var db = new AppDataContextname();

db.Projects.AddObject(newProj);

// at this point, newProj.ID is NOT set

db.SaveChanges(); // record is added to db.
// now, the ID property of the Project object is set!!!

// if the last ID in that table is '25', and you have auto-increment,
// then the object's ID property will now be 26!
Console.WriteLine(newProj.ID); // will output "26"

我绞尽脑汁想了很长一段时间,直到我意识到上面的代码是有效的。在linqtosql和EF4中工作。

对于POCO实体,必须使用接口、反射或 dynamic .

与 EntityObject EntityKey

 public override TR Create<T, TR>(T entity)
    {
        string entitySet = GetEntitySetName<T>();
        _context.AddObject(entitySet, entity);
        _context.SaveChanges();

        //Returns primaryKey value
        return (TR)context.CreateEntityKey(entitySet, entity).EntityKeyValues[0].Value;                       
    }

其中T:实体类型,TR:实体PK类型。

 With reflection you can obtain the Id property.


public override int Create<T>(T entity)
    {
        string entitySet = GetEntitySetName<T>();
        _context.AddObject(entitySet, entity);
        _context.SaveChanges();

         var idProperty = item.GetType().GetProperty("Id").GetValue(entity,null);
         return (int)idProperty;
    }