LINQ 中的 IN 子句 [英] Where IN clause in LINQ

问题描述

如何制作一个类似于 SQL Server 中的 where in 子句?

How to make a where in clause similar to one in SQL Server?

我自己做了一个，但有人可以改进吗?

I made one by myself but can anyone please improve this?

    public List<State> Wherein(string listofcountrycodes)
    {
        string[] countrycode = null;
        countrycode = listofcountrycodes.Split(',');
        List<State> statelist = new List<State>();

        for (int i = 0; i < countrycode.Length; i++)
        {
            _states.AddRange(
                 from states in _objdatasources.StateList()
                 where states.CountryCode == countrycode[i].ToString()
                 select new State
                 {
                    StateName  = states.StateName                    

                 });
        }
        return _states;
    }

推荐答案

这个表达式应该可以达到你想要的效果.

This expression should do what you want to achieve.

dataSource.StateList.Where(s => countryCodes.Contains(s.CountryCode))

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