写出两个字符串的所有最长子串

如题，C# codes 如下：

public static string[] GetBiggestString(string str1, string str2)

{

var max=0;

var count = 0;

ArrayList container = new ArrayList();

for (int i = 0; i < str2.Length; i++)

{

//Reset count

if (count != 0)

{

count = 0;

}

for (int j = 0; j < str1.Length; j++)

{

if (i + count < str2.Length)

{

if (str1[j] == str2[i + count])

{

count++;

if (count > max)

{

//Clear arrayList

container.Clear();

max = count;

//To judge if the string has already been in arraylist

if (!container.Contains(str2.Substring(i, count)))

{

container.Add(str2.Substring(i, count));

}

}

else if (count == max)

{

//To judge if the string has already been in arraylist

if (!container.Contains(str2.Substring(i, count)))

{

container.Add(str2.Substring(i, count));

}

}

}

else

{

//Go back

j -= count;

//Reset count

count = 0;

}

}

}

}