var club1 = context.Clubs.Single(x => x.Name == "Club1");

//方式1
context.Clubs.Remove(club1);
//方式2
context.Remove(club1);

var club2 = context.Clubs.Single(x => x.Name == "Club2");

//方式3 删除多个
context.Clubs.RemoveRange(club1, club2);

//方式3 删除多个
context.RemoveRange(club1, club2);

//saveRange之后才会真正删除,返回被删除的个数
var count=context.SaveChanges();