使变量可用于我班的所有领域

Question

如何使上述类中的变量cRentStart可供程序中的所有类访问？

目前，我在form1初始化时使用dateCheck ，因此我想保留它，并继续在另一个名为private void viewOverdue_Click的事件中使用它

public Form1()
{
    InitializeComponent();
    viewRent.ForeColor = Color.Red;
    dateCheck();
}

void dateCheck()
{

    CurrentDate.Text = "" + DateTime.Now;
    DateTime cRentStart, cRentEnd;
    DateTime today = DateTime.Now;  

    if (today.DayOfWeek == DayOfWeek.Monday)
    {
        cRentStart = today.AddDays(-5);
        cRentEnd = today.AddDays(2);
        CurrentRent.Text = "Current Rent Week: " + cRentStart.ToString("dd/MM/yyyy") + " - " + cRentEnd.ToString("dd/MM/yyyy");
    }
    else if (today.DayOfWeek == DayOfWeek.Tuesday)
    {
        cRentStart = today.AddDays(-6);
        cRentEnd = today.AddDays(1);
        CurrentRent.Text = "Current Rent Week: " + cRentStart.ToString("dd/MM/yyyy") + " - " + cRentEnd.ToString("dd/MM/yyyy");
    }
    else if (today.DayOfWeek == DayOfWeek.Wednesday)
    {
        cRentStart = today.AddDays(0);
        cRentEnd = today.AddDays(7);
        CurrentRent.Text = "Current Rent Week: " + cRentStart.ToString("dd/MM/yyyy") + " - " + cRentEnd.ToString("dd/MM/yyyy");
    }
    else if (today.DayOfWeek == DayOfWeek.Thursday)
    {
        cRentStart = today.AddDays(-1);
        cRentEnd = today.AddDays(6);
        CurrentRent.Text = "Current Rent Week: " + cRentStart.ToString("dd/MM/yyyy") + " - " + cRentEnd.ToString("dd/MM/yyyy");
    }
    else if (today.DayOfWeek == DayOfWeek.Friday)
    {
        cRentStart = today.AddDays(-2);
        cRentEnd = today.AddDays(5);
        CurrentRent.Text = "Current Rent Week: " + cRentStart.ToString("dd/MM/yyyy") + " - " + cRentEnd.ToString("dd/MM/yyyy");
    }
    else if (today.DayOfWeek == DayOfWeek.Saturday)
    {
        cRentStart = today.AddDays(-3);
        cRentEnd = today.AddDays(4);
        CurrentRent.Text = "Current Rent Week: " + cRentStart.ToString("dd/MM/yyyy") + " - " + cRentEnd.ToString("dd/MM/yyyy");
    }
    else if (today.DayOfWeek == DayOfWeek.Sunday)
    {
        cRentStart = today.AddDays(-4);
        cRentEnd = today.AddDays(3);
        CurrentRent.Text = "Current Rent Week: " + cRentStart.ToString("dd/MM/yyyy") + " - " + cRentEnd.ToString("dd/MM/yyyy");
    }
}

Answer 1

您想要的称为全局变量。
请参见本页上的全局变量。

一些注意事项：

• 在解析该对象的任何地方，都可以访问公共全局变量。
• 公开您的类的任何地方都可以访问公共静态全局变量。
• 私有全局变量的工作原理与预期相同，只能由该类/对象在内部使用。

例

namespace MyApp
{
    public class MyClass
    {
        public static string MyString { get; set; }

        public MyClass()
        {

        }
    }

    public class MyOtherClass
    {
        public MyOtherClass()
        {
            MyClass.MyString = "Test";
        }
    }
}

Answer 2

通过赋予它正确的范围... http://msdn.microsoft.com/zh-cn/library/ms973875.aspx

目前，cRentStart的范围仅限于dateCheck方法。 在具有适当访问器的范围之外声明它，以从其他位置访问它。