Question

首先英语不是我的母语，而且标题可能太糟糕了，所以我表示歉意，主持人可以根据需要随意编辑标题。

我在Receipt类中有createGrpButtons方法，该方法实例化了CreateGrpButtons类，并使用返回的List在窗体上创建按钮。如果我在方法内部使用相同的代码，则可以使用，但是当我将代码移入类时，它将停止工作。列表项仍被传递（调试时可以看到它们），但未创建按钮。

 public class TodoItem
        {
            public string Content { get; set; }
            public string Margin { get; set; }
            public string Tag { get; set; }
            public int Height { get; set; }
            public int Width { get; set; }

        }

          private void createGrpButtons()
        {

            int stPanelHeight = (Convert.ToInt16(stPanel.ActualHeight));
            int stPanelWidth = (Convert.ToInt16(stPanel.ActualWidth));

            GenerateGrpButtons btnGenGrp = new GenerateGrpButtons();
            btnList.ItemsSource = btnGenGrp.CreateGrpButtons(70, 0, stPanelHeight, stPanelWidth);

        }

这是createGrpButton类

class GenerateGrpButtons:frmReceipt 
    {

            public List<TodoItem> CreateGrpButtons( int btnMinimumHeightSize, int separationY, int pnlHeight, int pnlWidth)
        {
            //Calculate size of container to determine numbers of button
            //int btnMinimumHeightSize = 40;
            //int separationY = 0; //separation between buttons

            int btnNumberCreated = (pnlHeight / btnMinimumHeightSize);

            List<TodoItem> btns = new List<TodoItem>();

            for (int i = 0; i < btnNumberCreated; i++)
            {
                if (i == btnNumberCreated - 1)
                {
                    var HeightTmp = (Convert.ToDouble(stPanel.ActualHeight)) - (btnMinimumHeightSize * i);
                    btns.Add(new TodoItem() { Content = "ˇˇˇˇ", Height = Convert.ToInt16(HeightTmp), Width = Convert.ToInt16(stPanel.ActualWidth), Tag = "LastGrp", Margin = "0,0,0,0" });
                }
                else
                {
                    btns.Add(new TodoItem() { Content = "Group " + i, Height = btnMinimumHeightSize, Width = Convert.ToInt16(stPanel.ActualWidth), Tag = "Grp" + Convert.ToString(i), Margin = "1," + separationY + ",0,0" });
                }
            }

            return btns;
         }
    }

当我在这里调试时：

 btnList.ItemsSource = btnGenGrp.CreateGrpButtons(70, 0, stPanelHeight, stPanelWidth);

我可以看到创建了一些项目，并且可以看到项目属性，但是没有在表单上创建按钮。

但是，如果我执行此操作（方法中的所有操作），则按钮将出现在表单上。

    //Calculate size of container to determine numbers of button
    int btnMinimumHeightSize = 40;
    int separationY = 0; //separation between buttons

    int btnNumberCreated = ((Convert.ToInt16(stPanel.ActualHeight) / btnMinimumHeightSize));

    List<TodoItem> btns = new List<TodoItem>();

    for (int i = 0; i < btnNumberCreated; i++)
    {
        if (i == btnNumberCreated - 1)
        {
            var HeightTmp = (Convert.ToDouble(stPanel.ActualHeight)) - (btnMinimumHeightSize * i);
            btns.Add(new TodoItem() { Content = "ˇˇˇˇ", Height = Convert.ToInt16(HeightTmp), Width = Convert.ToInt16(stPanel.ActualWidth), Tag = "LastGrp", Margin = "0,0,0,0" });
        }
        else
        {
            btns.Add(new TodoItem() { Content = "Group " + i, Height = btnMinimumHeightSize, Width = Convert.ToInt16(stPanel.ActualWidth), Tag = "Grp" + Convert.ToString(i), Margin = "1," + separationY + ",0,0" });
        }
    }
    btnList.ItemsSource = btns;

按钮是通过以下方式绑定的：

 <StackPanel  Grid.Column="1" Grid.Row="1" Name="stPanel" HorizontalAlignment="Stretch" >
                <ItemsControl Name="btnList">
                    <ItemsControl.ItemTemplate>
                        <DataTemplate>
                            <Button Content ="{Binding Content}" Height="{Binding Height}" Width="{Binding Width}" Tag="{Binding Tag}" Margin="{Binding Margin}" HorizontalAlignment="Center"  Click="ClickHandlerGrp" />
                        </DataTemplate>
                    </ItemsControl.ItemTemplate>
                </ItemsControl>
            </StackPanel>

有人知道我在哪里搞砸了吗？

Answer 1

即使stPanelHeight和stPanelWidth值已正确提供给方法，该方法仍直接访问stPanel.ActualHeight和stPanel.ActualWidth。

您是否知道为什么从Class返回的List项不起作用？

1 个答案: