IQueryable <T>按ID列表篩選

Question

假設我們有一個IQueryable<T>。 Where子句可以通過單個ID值進行過濾，但是如何根據ID列表返回IQueryable？從tblSearches

[TestMethod] 
public void TestIQueryableWithList() 
{ 
    int ID1 = 1; 
    List<int> IDs = new List<int> { 1, 3, 4, 8 }; 

    using (var db = new SellooEntities())    
    { 
     // works fine as single value 
     var iq = db.tblSearches.Where(x => x.seaUserId == ID1); 

     // how can i do it to check for all the IDs ?? 
     foreach(int ID in IDs) 
     { 
      // this obviously wont work 
      var iq = db.tblSearches.Where(x => x.seaUserId == ID); 
     } 
    }    
} 

Answer 1

獲取數據，其中seaUserId是IDs列表：

[TestMethod] 
public void TestIQueryableWithList() 
{ 
    int ID1 = 1; 
    List<int> IDs = new List<int> { 1, 3, 4, 8 }; 

    using (var db = new SellooEntities())    
    { 
     var iq = db.tblSearches.Where(x => IDs.Contains(x.seaUserId); 
    }    
} 

Answer 2

您可以使用Contains

var iq = db.tblSearches.Where(x => Ids.Contains(x.seaUserId) == ID);