无法循环执行此switch case语句

Question

如何循环此switch语句？

我想在单击另一个按钮时更改3种按钮的颜色。我需要在情况4到情况1之间无限循环。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Integer余数，将满足您的需求。非零余数的符号与左操作数的符号相同]

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;
    }
}

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