Question

假设我们有一个IQueryable<T>。 Where子句可以按单个ID值进行过滤，但如何根据ID列表返回IQueryable？

[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tblSearches获取seaUserId IDs列表中的数据：

[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));

IQueryable <t>按ID列表过滤</t>

2 个答案: