/// <summary>
/// 在当前关联基础上再创建关联
/// </summary>
/// <typeparam name="TJoin2">再关联的类型</typeparam>
/// <param name="expression">关联语法</param>
/// <param name="joinType">关联类型</param>
/// <returns></returns>
public LambdaQueryJoin <TJoin, TJoin2> Join <TJoin2>(Expression <Func <TJoin, TJoin2, bool> > expression, JoinType joinType = JoinType.Inner) where TJoin2 : IModel, new()
{
//like
//query.Join<Code.Member>((a, b) => a.UserId == b.Id)
// .Select((a, b) => new { a.BarCode, b.Name })
// .Join<Code.Order>((a, b) => a.Id == b.Id);
var query2 = new LambdaQueryJoin <TJoin, TJoin2>(BaseQuery);
var innerType = typeof(TJoin2);
//BaseQuery.__JoinTypes.Add(new TypeQuery(innerType), joinType);
BaseQuery.GetPrefix(innerType);
string condition = BaseQuery.FormatJoinExpression(expression.Body);
BaseQuery.AddInnerRelation(new TypeQuery(innerType), joinType, condition);
return(query2);
}