c# - 在 C# 作用域外声明变量

Question

真是个愚蠢的问题，因为我认为你做不到，但是

 namespace Parking_Ticket_Fines
 {
   public partial class frmParking : Form
   {
    public frmParking()
    {
        InitializeComponent();
    }

    private void btnCal_Click(object sender, EventArgs e)
    {
        //Variable
        int Total = 0;

        //Checks which radio button is checked
        if (radExpired.Checked)
        {
            Total = 35;
        }
        else if (radParking.Checked)
        {
            Total = 75;
        }
        else if (radDriveway.Checked)
        {
            Total = 150;
        }
        else if (radHandicap.Checked)
        {
            Total = 500;
        }
    }

    private void btnClear_Click(object sender, EventArgs e)
    {
        //Clears everything 
        lblTotal.Text = "";
        radRepeat.Checked = false;
        radExpired.Checked = true;
    }

有没有一种方法可以在两个私有(private)空隙中使用“Total”变量而无需声明两次？

Answer 1

Is there a way I can use the "Total" variable in both private voids without declaring it in twice?

是的，在类级别声明它。

public partial class frmParking : Form
   {
    private int Total; //Here 
    public frmParking()
    {
        InitializeComponent();
    }

Total 将是一个字段阅读更多关于 Fields (C# Programming Guide)