Question

我知道如何使用构造函数将对象从父窗体传递到子窗体。

例如，在父表单中，我这样做：

WithdrawDialog dlg = new WithdrawDialog(cust.Accounts);

儿童表格：

public WithdrawDialog(BankAccountCollection accounts)
{
    InitializeComponent();
    PopulateComboBox(accounts);
}

// populate comboBox with accounts
private void PopulateComboBox(BankAccountCollection accounts)
{
    foreach (BankAccount b in accounts)
    {
        comboBoxAccount.Items.Add(b);
    }
}

我仍然试图搞定属性......如何使用属性而不是重载构造函数来执行此操作？

Answer 1

你走了：

WithdrawDialog dlg = new WithdrawDialog();
dlg.accounts = cust.Accounts;
dlg.Show();

public WithdrawDialog()
{
    InitializeComponent();
}

private BankAccountCollection m_Accounts;
public BankAccountCollection accounts {
   get {
      return m_Accounts;
   }
   set {
      m_Accounts = value;
      PopulateComboBox(m_Accounts);
   }
}

// populate comboBox with accounts
private void PopulateComboBox(BankAccountCollection accounts)
{
    foreach (BankAccount b in accounts)
    {
        comboBoxAccount.Items.Add(b);
    }
}

或者，可以重写PopupComboBox以使用accounts属性：

// populate comboBox with accounts
private void PopulateComboBox()
{
    foreach (BankAccount b in this.accounts)
    {
        comboBoxAccount.Items.Add(b);
    }
}

Answer 2

在WithdrawDialog中执行：

public WithdrawDialog()
{
    InitializeComponent();
}

public BankAccountCollection Accounts{
    set{
        PopulateComboBox(value);
    }
}

调用表单中的

执行：

WithdrawDialog dlg = new WithdrawDialog{Accounts=cust.Accounts};

（这个花括号调用Object Initializer）

Answer 3

在父母表格中：

WithdrawDialog dlg = new WithdrawDialog();
dlg.Accounts = cust.Accounts;

儿童表格：

public class WithdrawDialog
{
    private BankAccountCollection _accounts;

    public WithdrawDialog()
    {
        InitializeComponent();
    }

    public BankAccountCollection Accounts
    {
        get { return _accounts; }
        set { _accounts = value; PopulateComboBox(_accounts); }
    }

    // populate comboBox with accounts
    private void PopulateComboBox(BankAccountCollection accounts)
    {
        foreach (BankAccount b in accounts)
        {
            comboBoxAccount.Items.Add(b);
        }
    }
}

Answer 4

虽然可以使用公共财产来执行此操作，但不建议这样做。方法更适合这种情况，因为您需要执行逻辑来填充控件。

如果您只是想从构造函数中删除它，请将PopulateComboBox设置为public或internal（如果父项和子项位于同一个程序集中），并考虑将名称更改为更具描述性的名称，例如“PopulateBankAccounts”或“AddBankAccounts”。

然后您可以在父表单中执行以下操作：

using (WithdrawDialog dlg = new WithdrawDialog())
{
    dlg.AddBankAccounts(cust.Accounts)
    DialogResult result = dlg.ShowDialog();

    if (result == DialogResult.Ok)
    {
        //etc...
    }
}

通过属性将对象从父窗体传递到子窗体（Winforms）

4 个答案: