多个数组转化为一个数组的方法

 /// <summary>
    /// 将三个字符串数组合并成一个字符串数组
    /// </summary>
    /// <param name="a"></param>
    /// <param name="b"></param>
    /// <param name="c"></param>
    /// <returns></returns>
    static string[] MergeArray(string[] a, string[] b,string[] c)
    {

        ArrayList student = new ArrayList();
        foreach (string s1 in a)
        {
            student.Add(s1);
        }
        foreach (string s2 in b)
        {
            bool flag = true;
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] == s2)
                {
                    flag = false;
                    break;
                }
            }
            if (flag)
            {
                student.Add(s2);
            }
        }
        foreach (string s3 in c)
        {
            bool flag = true;
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] == s3)
                {
                    flag = false;
                    break;
                }
            }
            for (int j = 0; j < b.Length; j++)
            {
                if (b[j] == s3)
                {
                    flag = false;
                    break;
                }
            }

            if (flag)
            {
                student.Add(s3);
            }
        }

        string[] c1 = (string[])student.ToArray(typeof(string));

        return c1;
    }

    /// <summary>
    /// 将三个控件数组合并成一个数组  LinkButton[]
    /// </summary>
    /// <param name="a"></param>
    /// <param name="b"></param>
    /// <param name="c"></param>
    /// <returns></returns>
    static LinkButton[] MergArray(LinkButton[] a,LinkButton[] b,LinkButton[] c)
    {
        int ale = a.Length + b.Length + c.Length;
        LinkButton[] lk = new LinkButton[ale];

        int le = 0;
       

        foreach (LinkButton s1 in a)
        {
            if (le < a.Length)
            {
                lk[le] = s1;
            }
            le = le + 1;
        }
        foreach (LinkButton s2 in b)
        {
            bool flag = true;
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] == s2)
                {
                    flag = false;
                    break;
                }
            }
            if (flag)
            {
                if(le<b.Length+a.Length)
                lk[le] = s2;
                le++;
            }
        }
        foreach (LinkButton s3 in c)
        {
            bool flag = true;
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] == s3)
                {
                    flag = false;
                    break;
                }
            }
            for (int j = 0; j < b.Length; j++)
            {
                if (b[j] == s3)
                {
                    flag = false;
                    break;
                }
            }

            if (flag)
            {
                if (le < a.Length + b.Length + c.Length)
                {
                    lk[le] = s3;
                    le++;
                }
            }
        }
        return lk;
    }