C#2008中的元组出错

Question

我在C#2010中创建了一个程序,我的代码包含一个元组,但是当我将我的程序放入C#2008时,它无法识别它,并且出现了以下错误:

"The type of namespace name 'Tuple' could not be found"

所以我不知道如何使这项工作,这是发生错误的代码行:

private List<Tuple<Point, Point>> lines = new List<Tuple<Point, Point>>();

请帮忙.

编辑

基本上这是我的代码,由于错误,目前无法编译:

public partial class Form1 : Form
{
    private bool isMoving = false;
    private Point mouseDownPosition = Point.Empty;
    private Point mouseMovePosition = Point.Empty;
    private List<Tuple<Point, Point>> lines = new List<Tuple<Point, Point>>();
    public Form1()
    {
        InitializeComponent();
    }

    private void pictureBox1_Paint(object sender, PaintEventArgs e)
    {
        var g = e.Graphics;
        if (isMoving)
        {
            g.Clear(pictureBox1.BackColor);
            g.DrawLine(Pens.Black, mouseDownPosition, mouseMovePosition);
            foreach (var line in lines)
            {
                g.DrawLine(Pens.Black, line.Item1, line.Item2);
            }
        }
    }

    private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
    {
        isMoving = true;
        mouseDownPosition = e.Location;
    }

    private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
    {
        if (isMoving)
        {
            mouseMovePosition = e.Location;
            pictureBox1.Invalidate();
        }
    }

    private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
    {
        if (isMoving)
        {
            lines.Add(Tuple.Create(mouseDownPosition, mouseMovePosition));
        }
        isMoving = false;
    }
}

所以我需要一种改变或使Tuple在VS C#2008和2010中工作的方法,

谢谢

Answer 1

该Tuple班是不是在V4预框架,但这里是一个简化的版本,应该匹配满足你的需要:

public class Tuple<T,U>
{
    public T Item1 { get; private set; }
    public U Item2 { get; private set; }

    public Tuple(T item1, U item2)
    {
        Item1 = item1;
        Item2 = item2;
    }
}

public static class Tuple
{
    public static Tuple<T, U> Create<T, U>(T item1, U item2)
    {
        return new Tuple<T, U>(item1, item2);
    }
}

您可以轻松添加类以使元组具有2个以上的参数