c# - 可查询的按 ID 列表过滤

Question

假设我们有一个IQueryable<T>. 该Where子句可以按单个 ID 值进行过滤，但是如何IQueryable根据 ID 列表返回一个？

[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

从列表中的tblSearches位置获取数据：seaUserIdIDs

[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

您可以使用包含

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