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mongodb实现MSsql中的in操作

public async Task> GetRoleForMenuAuthority(string roleid)
{
var rid = roleid.Split(char.Parse(","));
List rids = new List();
for (int i = 0; i < rid.Length; i++) rids.Add(int.Parse(rid[i]));
MongoDbHelper rfma = new MongoDbHelper();
return await rfma.ListByConditionAsync(r => rids.Contains(r.RoleId));
}