循环此 switch case 语句时遇到问题

Question

如何循环这个 switch 语句？

我想在单击另一个按钮时更改 3 种按钮颜色。我需要在案例 4 到案例 1 之后无限循环它。 我愿意接受任何其他解决方案。

private void Next_Click(object sender, EventArgs e)
{            
    i++;

    switch (i)
    {
        case 1:
            red.BackColor = Color.Red;
            orange.BackColor = Color.Black;
            green.BackColor = Color.Black;
            break;
        case 2:
            red.BackColor = Color.Red;
            oragne.BackColor = Color.Orange;
            green.BackColor = Color.Black;
            break;
        case 3:
            red.BackColor = Color.Black;
            orange.BackColor = Color.Black;
            green.BackColor = Color.Green;
            break;
        case 4:
            red.BackColor = Color.Black;
            orange.BackColor = Color.Orange;
            green.BackColor = Color.Black;
            break;
    }
}

Answer 1

使用整数余数，将为您解决。非零余数的符号与左侧操作数的符号相同

private void Next_Click(object sender, EventArgs e)
{            
    switch (i++ % 4)
    {
        case 0:
            red.BackColor = Color.Red;
            orange.BackColor = Color.Black;
            green.BackColor = Color.Black;
            break;
        case 1:
            red.BackColor = Color.Red;
            oragne.BackColor = Color.Orange;
            green.BackColor = Color.Black;
            break;
        case 2:
            red.BackColor = Color.Black;
            orange.BackColor = Color.Black;
            green.BackColor = Color.Green;
            break;
        case 3:
            red.BackColor = Color.Black;
            orange.BackColor = Color.Orange;
            green.BackColor = Color.Black;
            break;
    }
}

更多阅读：https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/arithmetic-operators