5

この関数は EntityFramework 4.0 (ObjectContext) で使用しています。現在、EF 5.0 を使用しています。私の問題はDefaultContainerNameGetObjectByKeyメソッドが見つからないことですDBContext

public static T GetObjectByID<T>(int ID, string tableName = "")
        {
            var localDB = new LocalBaseEntities();

            string entitySetName = string.Format("{0}.{1}", localDB.DefaultContainerName, string.IsNullOrEmpty(tableName) ? typeof(T).Name + "s" : tableName);

            try
            {
                IEnumerable<KeyValuePair<string, object>> entityKeyValues =
                new KeyValuePair<string, object>[] { new KeyValuePair<string, object>(typeof(T).Name + "ID", ID) };
                EntityKey key = new System.Data.EntityKey(entitySetName, entityKeyValues);            
                return (T)localDB.GetObjectByKey(key);
            }
            catch (Exception)
            { }            

            return default(T);
        }

この関数を変換するには?

または、このような機能を作成する方法は?

4

1 に答える 1

15

DbContext is an adapter (wrapper) over ObjectContext. Also it implements explicitly interface IObjectContextAdapter. Cast you dbContext to this interface type and wrapped ObjectContext instance will be available:

ObjectContext context = ((IObjectContextAdapter)dbContext).ObjectContext;

BTW new class DbSet<T> has method Find which also searches entities by key. So, it seems all your code now will look like

T entity = dbContext.Set<T>().Find(id);
于 2012-11-19T14:27:44.053 に答える