C#如何在Windows窗体应用程序的字符串中执行一些基本数学运算

string input = "2 + 3";
MatchCollection matches = Regex.Matches(input, @"\d+");
List<int> numbers = new List<int>();

foreach (Match match in matches)
{
    int number;
    if (int.TryParse(match.Value, out number))
    {
        numbers.Add(number);
    }
}

string input = "2 + 3";
string[] elements = input.Split(' ');

int number1 = int.Parse(elements[0]);
string oper = elements[1];
int number2 = int.Parse(elements[2]);
int result = 0;

switch (oper)
{
    case "+":
        result = number1 + number2;
        break;
    case "-":
        result = number1 - number2;
        break;
    case "*":
        result = number1 * number2;
        break;
    case "/":
        result = number1 / number2;
        break;
}

string input = "2 + 3";
string[] elements = input.Split(' ');

int number1 = int.Parse(elements[0]);
string oper = elements[1];
int number2 = int.Parse(elements[2]);
int result = 0;

switch (oper)
{
    case "+":
        result = number1 + number2;
        break;
    case "-":
        result = number1 - number2;
        break;
    case "*":
        result = number1 * number2;
        break;
    case "/":
        result = number1 / number2;
        break;
}

labelResult.Text = result.ToString();