Question

您好我正在为我的项目的一部分编写测试计划，我想知道如何衡量我的排序功能需要多长时间。我的尝试看起来像这样：

    private void byIGNameToolStripMenuItem_Click(object sender, EventArgs e)
    {
        GameDB.Sort(new PlayerNameComparer());
        currentEntryShown = 0;
        ShowData();
        UpdatePrevNextBtnStatus();
    }
    public class PlayerNameComparer : IComparer
    {
        Stopwatch stopwatch = new Stopwatch();
        stopwatch.Start();
        public int Compare(object x, object y)
        {
            return ((Player)x).playerIgName.CompareTo(((Player)y).playerIgName);
        }
        stopwatch.Stop();
        MessageBox.Show("Time Elapsed:" + stopwatch.ElapsedMilliseconds);
    }

但我收到编译错误：'DBProject.Form1.PlayerNameComparer.stopwatch' is a 'field' but is used like a 'type'

Answer 1

这个答案是完全错误的，因为你在Compare方法中并且在排序过程中被多次调用。

测试此方法的方法与此类似：

private void byIGNameToolStripMenuItem_Click(object sender, EventArgs e)
{
    Stopwatch stopwatch = new Stopwatch();
    stopwatch.Start();

    GameDB.Sort(new PlayerNameComparer());

    stopwatch.Stop();
    MessageBox.Show("Time Elapsed:" + stopwatch.ElapsedMilliseconds);

    currentEntryShown = 0;
    ShowData();
    UpdatePrevNextBtnStatus();
}
public class PlayerNameComparer : IComparer
{

    public int Compare(object x, object y)
    {
        return ((Player)x).playerIgName.CompareTo(((Player)y).playerIgName);
    }

}

同时考虑使用IComparer的通用版本，因为它是强类型的，您无需从object类型拆分到class类型。

一个很好的例子可能是：

public class StringComparer : IComparer<string>
{
    public int Compare(string x, string y)
    {
        return x.CompareTo(y);
    }
}

在你的情况下可以变成：

public class PlayerNameComparer : IComparer<Player>
{
    public int Compare(Player x, Player y)
    {
        return x.playerIgName.CompareTo(y.playerIgName);
    }
}

Answer 2

您正在类区域中执行语句，而不是在方法中执行; ）
在PL语言中 - ＆gt; Nie mozesz wykonywać kodu w obrębie klasy, rób to w metodach : )
只需将它们放入方法

即可

public int Compare(object x, object y)
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
int ret =((Player)x).playerIgName.CompareTo(((Player)y).playerIgName)
stopwatch.Stop();
MessageBox.Show("Time Elapsed:" + stopwatch.ElapsedMilliseconds); 
    return ret;

}

但是该代码会针对您要排序的每个项目执行，因此如果您在排序之前启动手表会更好，并在此之后停止：）

private void byIGNameToolStripMenuItem_Click(object sender, EventArgs e)
{    
    Stopwatch stopwatch = new Stopwatch();
    stopwatch.Start();
    GameDB.Sort(new PlayerNameComparer());
    stopwatch.Stop();
    MessageBox.Show("Time Elapsed:" + stopwatch.ElapsedMilliseconds); 

    currentEntryShown = 0;
    ShowData();
    UpdatePrevNextBtnStatus();
}
public class PlayerNameComparer : IComparer
{
    public int Compare(object x, object y)
    {
        return ((Player)x).playerIgName.CompareTo(((Player)y).playerIgName);
    }
}

如何衡量IComparer的使用时间？

2 个答案: