找不到InsertOnSubmit()方法

Question

我是Entity Framework的新手,我认为这里有一些我误解的东西.我试图在表中插入一行,并且在我找到代码示例的任何地方,他们调用方法InsertOnSubmit(),但问题是我找不到方法InsertOnSubmit或SubmitChanges.

错误告诉我:System.Data.Object.ObjectSet不包含InsertOnSubmit的定义,...

我做错了什么？

http://msdn.microsoft.com/en-us/library/bb763516.aspx

        GMR_DEVEntities CTX;
        CTX = new GMR_DEVEntities();
        tblConfig Config = new tblConfig { ID = Guid.NewGuid(), Code = "new config code" };
        CTX.tblConfigs.InsertOnSubmit(Config); // Error here

编辑:在FW 4.0上使用Visual Studio 2010

Answer 1

InsertOnSubmit 是一个Linq-to-SQL方法,而不是在Entity Framework中.

但是,由于我们的项目是从Linq-to到SQL的转换,我们有一些可能有用的扩展方法:

public static class ObjectContextExtensions
{
    public static void SubmitChanges(this ObjectContext context)
    {
        context.SaveChanges();
    }

    public static void InsertOnSubmit<T>(this ObjectQuery<T> table, T entity)
    {
        table.Context.AddObject(GetEntitySetName(table.Context, entity.GetType()), entity);
    }

    public static void InsertAllOnSubmit<T>(this ObjectQuery<T> table, IEnumerable<T> entities)
    {
        var entitySetName = GetEntitySetName(table.Context, typeof(T));
        foreach (var entity in entities)
        {
            table.Context.AddObject(entitySetName, entity);
        }
    }

    public static void DeleteAllOnSubmit<T>(this ObjectQuery<T> table, IEnumerable<T> entities) where T : EntityObject, new()
    {
        var entitiesList = entities.ToList();
        foreach (var entity in entitiesList)
        {
            if (null == entity.EntityKey)
            {
                SetEntityKey(table.Context, entity);
            }

            var toDelete = (T)table.Context.GetObjectByKey(entity.EntityKey);
            if (null != toDelete)
            {
                table.Context.DeleteObject(toDelete);
            }
        }
    }

    public static void SetEntityKey<TEntity>(this ObjectContext context, TEntity entity) where TEntity : EntityObject, new()
    {
        entity.EntityKey = context.CreateEntityKey(GetEntitySetName(context, entity.GetType()), entity);
    }

    public static string GetEntitySetName(this ObjectContext context, Type entityType)
    {
        return EntityHelper.GetEntitySetName(entityType, context);
    }
}

哪里EntityHelper是每MyExtensions开源库.

Answer 2

你好这对我有用

Entity db = new Entity();

TABLE_NAME table = new TABLE_NAME 
                    {
                       COLUMN1 = "TEST",
                       cOLUMN2 = "test"
                      //etc...
                    };

                    db.TABLE_NAME.Add(table);
                    db.SaveChanges();