c# Lamda表达式 简化语法例子

public bool HasRole(string[] roleList)
        {
            bool result;
            string[] roleListStored, roleListInput;
            string itemStoredToLower;

            result = false;

            roleListStored = this.roleList;
            roleListInput = roleList;

            if ((roleListStored != null) &&
                (roleListInput != null))
            {
                foreach (string itemStored in roleListStored)
                {
                    if (itemStored != null)
                    {
                        itemStoredToLower = itemStored.ToLower();

                        foreach (string itemInput in roleListInput)
                        {
                            if ((itemInput != null) &&
                                (itemInput.ToLower() == itemStoredToLower))
                            {
                                result = true;

                                break;
                            }
                        }

                        if (result)
                        {
                            break;
                        }
                    }
                }
            }

            return result;
        }

    string[] roleLis = new string[] { "18","22","95"};
            string[] roleLisInput = new string[] { "1", "22","8","5" };
            var s = roleLisInput.Count(n => string.IsNullOrEmpty(n) == false &&  n.ToLower()== roleLis.FirstOrDefault(n2 => n2 == n.ToLower()))>0;