使用陣列以外的東西來實體化新物件

我是一名學生，試圖構建一個捕獲復雜資訊的程式。有一個基類和 2 個從基類繼承的類（MultiUnits 和 SingleFamily）。我有這個程式可以使用預加載的值，但我希望能夠輸入來自用戶的資料。如何在程式運行時更改陣列的大小，或者如何使用串列來存盤相同的資料。

我嘗試將資料存盤在串列中并且它可以作業，但是當我在其上運行 for each 回圈時，我收到以下錯誤：

CS1579 foreach 陳述句無法對“SingleFamily”型別的變數進行操作，因為“SingleFamily”不包含“GetEnumerator”的公共實體或擴展定義

public partial class HousingPresentationGUI : Form
{
    SingleFamily[] privateHome;
    MultiUnits[] multi;
    public HousingPresentationGUI()
    {
        InitializeComponent();
    }

    private void HousingPresentationGUI_Load(object sender, EventArgs e)
    {
        privateHome = new SingleFamily[5];

        privateHome[0] = new SingleFamily("34 Winston Street", 3, 2, 900.00m);
        privateHome[1] = new SingleFamily("5234 Carolina Ave", 2, 2, 850.00m);
        privateHome[2] = new SingleFamily("54 Magnolia Court", 4, 2, 1150.00m);
        privateHome[3] = new SingleFamily("6910 Reiley", 3, 2, 1000.00m);
        privateHome[4] = new SingleFamily("76 St. Johns Ct.", 3, 2, 1000.00m);

        foreach (SingleFamily homes in privateHome)
        {
            lstBxSingle.Items.Add(homes.Address);
        }


        multi = new MultiUnits[2];

        multi[0] = new MultiUnits("8674 Victoria Lane", 2, 750.00m);
        multi[1] = new MultiUnits("9724 Bridge Street", 2, 700.00m);


        foreach (MultiUnits duplex in multi)
        {
            lstBxMulti.Items.Add(duplex.Address);
        }

    }

    private void cmboTypeOfRental_SelectedIndexChanged(object sender, EventArgs e)
    {
        lblRentalDetails.Text = "";

        lblInstructions.Visible = true;
        if (cmboTypeOfRental.SelectedIndex == 0)
        {
            lstBxSingle.Visible = true;
            lstBxMulti.Visible = false;
        }
        else
        {
            lstBxSingle.Visible = false;
            lstBxMulti.Visible = true;
        }

    }

    private void lstBxMulti_SelectedIndexChanged(object sender, EventArgs e)
    {
        foreach (MultiUnits duplex in multi)
        {
            if (duplex.Address == lstBxMulti.SelectedItem.ToString())
                lblRentalDetails.Text = duplex.ToString();
        }
    }

    private void lstBxSingle_SelectedIndexChanged(object sender, EventArgs e)
    {

        foreach (SingleFamily home in privateHome)
        {
            if (home.Address == lstBxSingle.SelectedItem.ToString())
                lblRentalDetails.Text = home.ToString();
        }

    }
}

uj5u.com熱心網友回復：

代替 SingleFamily[] 使用 List 而不是 MultiUnits[] 使用 List

public partial class HousingPresentationGUI : Form
{
    List<SingleFamily> privateHome = new List<SingleFamily>();
    List<MultiUnits> multi= new List<MultiUnits>();

    public HousingPresentationGUI()
    {
        InitializeComponent();
    }

    private void HousingPresentationGUI_Load(object sender, EventArgs e)
    {
        privateHome.Add(new SingleFamily("34 Winston Street", 3, 2, 900.00m));
        ....etc etc add the other private homes

        foreach (SingleFamily homes in privateHome)
        {
            lstBxSingle.Items.Add(homes.Address);
        }

        multi.Add(new MultiUnits("8674 Victoria Lane", 2, 750.00m));
        multi.Add(new MultiUnits("9724 Bridge Street", 2, 700.00m));

        foreach (MultiUnits duplex in multi)
        {
            lstBxMulti.Items.Add(duplex.Address);
        }

    }
}

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