我可以成功添加一個MenuFlyoutItem到MenuFlyout動態的ContextMenuFlyout_Opening事件，但是當我嘗試在洗掉它ContextMenuFlyout_Closing的MenuFlyout.Items總是空和MFI心不是發現并清除。
任何想法為什么會這樣？
<Page.Resources>
<MenuFlyout
x:Key="ListViewContextMenu"
Closing="{x:Bind ViewModel.ContextMenuFlyout_Closing}"
Opening="{x:Bind ViewModel.ContextMenuFlyout_Opening}">
<MenuFlyoutItem
Click="{x:Bind ViewModel.EditParty}"
Icon="Edit"
Text="Edit" />
<MenuFlyoutItem Text="Open in new window">
<MenuFlyoutItem.Icon>
<FontIcon
FontFamily="Segoe MDL2 Assets"
FontSize="40"
Glyph="" />
</MenuFlyoutItem.Icon>
</MenuFlyoutItem>
<MenuFlyoutSeparator />
<MenuFlyoutItem
Click="MenuFlyoutItem_Click"
Icon="Delete"
Text="Delete" />
</MenuFlyout>
</Page.Resources>
ViewModel 事件處理程式
public void ContextMenuFlyout_Opening(object sender, object e)
{
MenuFlyout flyout = sender as MenuFlyout;
if (flyout != null)
{
// If party.IsConflict = true then add the MFI
if (SelectedTalent.IsConflict)
{
flyout.Items.Add(new MenuFlyoutItem()
{
Icon = new FontIcon() { Glyph = "\uEC4F" },
Text = "Resolve Conflict"
});
}
}
}
public void ContextMenuFlyout_Closing(object sender, object e)
{
// Remove 'Resolve Conflict' MFI if its found
MenuFlyout flyout = sender as MenuFlyout;
if (flyout != null)
{
var rc = flyout.Items.FirstOrDefault(o => o.Name == "Resolve Conflict");
if (rc != null)
{
flyout.Items.Remove(rc);
}
}
}
使用 MenuFlyout 的 ListView
<ListView
ContextFlyout="{StaticResource ListViewContextMenu}"
uj5u.com熱心網友回復：
根據您的代碼，您似乎正在嘗試MenuFlyoutItem按名稱獲取物件。但是您在將MenuFlyoutItem物件添加到 時忘記為該物件提供名稱MenuFlyout，您剛剛添加了一個Text屬性。
flyout.Items.Add(new MenuFlyoutItem()
{
Icon = new FontIcon() { Glyph = "\uEC4F" },
Text = "Resolve Conflict",
Name = "Resolve Conflict",
});
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