Question

在下面的代码中，我正在尝试...

在网格（mygrid）中放置一个TextBlock（txtDays）（作为行）
将网格放在ListBox（lsBox）
最后将ListBox放入另一个Grid（ContentPanel）

程序正在崩溃而没有正确的错误，并且我执行此代码时模拟器停止。如果我将Grid（在2.中）放置在stackPanel内或直接放入另一个Grid（在3.中）而不将其放入ListBox中，代码可以工作，但不能使用ListBox。

任何意见，协助都表示赞赏。

谢谢。

    private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
    {
        string[] lstDays = new string[] { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };

        //Creating a ListBox
        ListBox lstBox = new ListBox();
        //Grid definition
        Grid mygrid = new Grid();
        ColumnDefinition c1 = new ColumnDefinition(); //creating a column
        mygrid.ColumnDefinitions.Add(c1);

        int i = -1;
        foreach (string item in lstDays)
        {
            i += 1;
            TextBlock txtDays = new TextBlock(); //Creating a TextBlock

            RowDefinition r1 = new RowDefinition(); //Creating a row
            mygrid.RowDefinitions.Add(r1);

            txtDays.Text = item;
            txtDays.TextAlignment = TextAlignment.Left;
            if (item == "Thursday")
            {
                txtDays.TextAlignment = TextAlignment.Right;
                txtDays.Foreground = new SolidColorBrush(Colors.Green);
            }

            mygrid.Children.Add(txtDays); //Adding the TextBlock into the grid
            Grid.SetRow(txtDays,i);       //Placing the item in a particular row inside the grid          
            lstBox.Items.Add(mygrid);     //Placing grid inside a listBox (ERROR here)

        }

        RowDefinition rNewRow = new RowDefinition();
        ContentPanel.RowDefinitions.Add(rNewRow);
        ContentPanel.Children.Add(lstBox);
    }

Answer 1

修复错误后的代码。这对初学者来说是一段很好的代码。

public partial class MainPage : PhoneApplicationPage
{
    // Constructor
    public MainPage()
    {
        InitializeComponent();
    }

    private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
    {
        string[] lstDays = new string[] { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" };

        //Creating a ListBox
        ListBox lstBox = new ListBox();

        foreach (string item in lstDays)
        {
            //Grid definition
            Grid mygrid = new Grid();
            mygrid.Width = 400;
            ColumnDefinition c1 = new ColumnDefinition(); //creating a column
            c1.Width = new GridLength(200);
            mygrid.ColumnDefinitions.Add(c1);

            RowDefinition r1 = new RowDefinition(); //Creating a row
            mygrid.RowDefinitions.Add(r1);

            TextBlock txtDays = new TextBlock(); //Creating a TextBlock
            txtDays.Text = item;
            txtDays.TextAlignment = TextAlignment.Left;
            if (item == "Thursday")
            {
                txtDays.TextAlignment = TextAlignment.Right;
                txtDays.Foreground = new SolidColorBrush(Colors.Green);
            }

            mygrid.Children.Add(txtDays); //Adding the TextBlock into the grid
            Grid.SetRow(txtDays,0);       //Placing the item in a particular row inside the grid          

            lstBox.Items.Add(mygrid);     //Placing grid inside a listBox    
        }

        RowDefinition rNewRow = new RowDefinition();
        ContentPanel.RowDefinitions.Add(rNewRow);
        ContentPanel.Children.Add(lstBox);
    }
}

Answer 2

您尝试在每次mygrid次迭代时将lstBox添加到foreach。将lstBox.Items.Add(mygrid);置于循环之外，使其仅添加一次。

如果您想要多个网格，请将mygrid的定义放在循环中。

在运行时将网格添加为ListBox的项目最终会导致未知错误/崩溃

2 个答案: