Question

我正在尝试创建一个基本的天气应用程序，您可以在其中输入城市的读数，它将显示平均温度，最低温度和最高温度。

我创建了一个包含5行（城市）和4列（4个读数）的2d数组（intTemps）。每当我向列表框添加温度时，它总是显示在左上角。当我添加另一个温度时，它会显示刚刚显示的温度和当前温度。

代码是基于我教授写的一个例子，所以我不确定为什么它显示不正确。

public partial class Form1 : Form
{
    string[] strNames = { "Livonia",
                          "Redford" ,
                          "Novi" ,
                          "Westland",
                          "Northville" };
    int[,] intTemps = new int[5, 4];

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        for (int i = 0; i <= 4; i++)
        {
            cobNames.Items.Add(strNames[i]);
            lstNames.Items.Add(strNames[i]);
        }
    }

    private void btnAdd_Click(object sender, EventArgs e)
    {
        try
        {
            if (cobNames.SelectedIndex >= 0 && cobNames.SelectedIndex <= 4)
            {
                if (intTemps[cobNames.SelectedIndex, (int)nudTemp.Value - 1] == 0)
                {
                    intTemps[cobNames.SelectedIndex, (int)nudTemp.Value - 1] = Int32.Parse(txtTemp.Text);
                }
                else
                {
                    MessageBoxButtons buttons = MessageBoxButtons.YesNo;
                    DialogResult result;
                    result = MessageBox.Show("Do you want to change temps?", "Temps already exist!", buttons);
                    if (result == System.Windows.Forms.DialogResult.Yes)
                    {
                        intTemps[cobNames.SelectedIndex, (int)nudTemp.Value - 1] = Int32.Parse(txtTemp.Text);
                    }
                }
                displayTemps();
            }
            else
            {
                MessageBox.Show("You must select a valid name!");
            }
        }
        catch (FormatException)
        {
            MessageBox.Show("Temps must be integers");
        }
    }

    private void displayTemps()
    {
        string strLine;
        lstTemp.Items.Clear();
        double[] dblAverages = new double[5];
        int intNonBlank = 0;

        for (int l = 0; l <= 4; l++)
        {
            intNonBlank = 0;
            for (int c = 0; c <= 3; c++)
            {
                if (intTemps[l, c] != 0)
                {
                    dblAverages[l] += intTemps[l, c];
                    intNonBlank++;
                }
            }
            if (intNonBlank != 0)
            {
                dblAverages[l] /= intNonBlank;
            }
        }
        for (int l = 0; l <= 4; l++)
        {                
            strLine = " ";
            for (int c = 0; c <= 3; c++)
            {
                if (intTemps[l, c] == 0)
                {
                    strLine += "     ";
                }
                else
                {
                    if (intTemps[l, c] == 120)
                    {
                        strLine += intTemps[l, c] + "  ";
                    }
                    else
                    {
                        strLine += intTemps[l, c] + "   ";
                    }
                    lstTemp.Items.Add(strLine);
                }
            }
        }
    }
}

Answer 1

我重写你的显示Temps（）程序。这将向lstTemp添加您需要的所有信息：

private void displayTemps()
{
    string strLine;
    lstTemp.Items.Clear();
    double[] dblAverages = new double[5];
    int intNonBlank = 0;

    for (int l = 0; l <= 4; l++)
    {
        intNonBlank = 0;
        for (int c = 0; c <= 3; c++)
        {
            if (intTemps[l, c] != 0)
            {
                dblAverages[l] += intTemps[l, c];
                intNonBlank++;
            }
        }
        if (intNonBlank != 0)
        {
            dblAverages[l] /= intNonBlank;
        }
        int min_temp = System.Linq.Enumerable.Range(0, 4).
            Select(i => intTemps[l, i]).Min();
        int max_temp = System.Linq.Enumerable.Range(0, 4).
            Select(i => intTemps[l, i]).Max();
        lstTemp.Items.Add(
            "Average temp for city "+ l +": " + dblAverages[l] + " " + 
            "Minimum " + min_temp + " " + 
            "Maximum " + max_temp);
    }           
}

C＃数组未正确显示

1 个答案: