我想修改以下LINQ to SQL查询：

using (NorthwindContext northwind = new NorthwindContext ()) {
    var q = from row in northwind.Customers
            let orderCount = row.Orders.Count ()
            select new {
                row.ContactName,orderCount
            };
}

这导致以下Tsql：

SELECT [t0].[ContactName],(
    SELECT COUNT(*)
    FROM [dbo].[Orders] AS [t1]
    WHERE [t1].[CustomerID] = [t0].[CustomerID]
    ) AS [orderCount]
FROM [dbo].[Customers] AS [t0]

至：

using (NorthwindContext northwind = new NorthwindContext ()) {
    var q = from row in northwind.Customers.With (
                        TableHint.NoLock,TableHint.Index (0))
            let orderCount = row.Orders.With (
                        TableHint.HoldLock).Count ()
            select new {
                row.ContactName,orderCount
            };
}

这将导致以下Tsql：

SELECT [t0].[ContactName],(
    SELECT COUNT(*)
    FROM [dbo].[Orders] AS [t1] WITH (HOLDLOCK)
    WHERE [t1].[CustomerID] = [t0].[CustomerID]
    ) AS [orderCount]
FROM [dbo].[Customers] AS [t0] WITH (NOLOCK,INDEX(0))

使用：

public static Table<TEntity> With<TEntity> (
    this Table<TEntity> table,params TableHint[] args) where TEntity : class {

    //TODO: implement
    return table;
}
public static EntitySet<TEntity> With<TEntity> (
    this EntitySet<TEntity> entitySet,params TableHint[] args) where TEntity : class {

    //TODO: implement
    return entitySet;
}

和

public class TableHint {
    //TODO: implement
    public static TableHint NoLock;
    public static TableHint HoldLock;
    public static TableHint Index (int id) {
        return null;
    }
    public static TableHint Index (string name) {
        return null;
    }
}

使用某种类型的LINQ to sql可扩展性,而不是this one.任何想法？