String.Join和String.Split参数助记符

string.Join(string separator, string[] values);

string[] fruits = { "apple", "banana", "orange" };
string result = string.Join(", ", fruits);
Console.WriteLine(result); // 输出：apple, banana, orange

string[] string.Split(string[] separator, int count, StringSplitOptions options);

string fruits = "apple, banana, orange";
string[] result = fruits.Split(", ");
foreach (string fruit in result)
{
    Console.WriteLine(fruit);
}

apple
banana
orange