Linq to Entity Dynamic where 子句

Question

我有 Linq to Entity 查询，就像你在下面看到的那样，我在我的代码中使用了五次，所有变化都是 where 子句。是否可以创建一个方法并仅传递 where 值，而不是编写所有代码五次。谢谢

    items = from t1 in _entities.table1
                      join t2 in _entities.Table2 on t1.column1 equals t2.column1
                      join t3 in _entities.Table3 on t1.column2 equals t3.column2
                      join t4 in _entities.Table4 on t1.column3 equals t4.column3

                      where **t1.column5 == Something**
                      select new
                                 {
                                    t1.column7,
                                    t2.column8,                                        
                                    t3.column9,
                                    t4.column10

                                 };

Answer 1

写一个基函数

public IQueryable<Object> Select()
{
   return (from t1 in _entities.table1
                      join t2 in _entities.Table2 on t1.column1 equals t2.column1
                      join t3 in _entities.Table3 on t1.column2 equals t3.column2
                      join t4 in _entities.Table4 on t1.column3 equals t4.column3
                      select new
                                 {
                                    t1.column7,
                                    t2.column8,                                        
                                    t3.column9,
                                    t4.column10,
                                    t1.column5
                                 }).AsQueryable<Object>();
}

然后函数一

public IQueryable<Object> SelectWhere1(object condition)
{
    return Select().Where(i=>i.column5==condition);
}

public IQueryable<Object> SelectWhere2(object otherCondition)
{
    return Select().Where(i=>i.column7==otherCondition);
}

....

Answer 2

如果写在函数表上，可以这样做：

DoQuery(Expression<Func<Table1Type, bool> lambda)
{

    return _entities.table1
           // Skipping the joins...
           .Where(lambda)
           .Select(t => new { t1.column7 });
}

你可以这样称呼它：

DoQuery(t => t.column5 == Something);