Linq to Entity動態where子句

Question

我有Linq to Entity查詢，就像你可以看到下面我在我的代碼中使用它五次，所有改變的是where子句。是否有可能創建一個方法並傳遞值，而不是將所有代碼寫入五次。謝謝

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

寫基函數

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>(); 
} 

然後起作用的一種

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); 
} 

....