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我正在關注MSDN示例，以便將設置頁面添加到我的第一個Windows Phone 8應用程序（警告 - 我完全是XAML的新手，我是C++人員）。WP8 xaml導致「元素已經是另一個元素的子元素」
的XAML看起來是這樣的：
<phone:PhoneApplicationPage
x:Class="PicoSDU.AppSettings"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:PicoSDU"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
mc:Ignorable="d"
shell:SystemTray.IsVisible="True">
<phone:PhoneApplicationPage.Resources>
<local:AppSettings x:Key="PicoSettings"></local:AppSettings>
</phone:PhoneApplicationPage.Resources>
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!--TitlePanel contains the name of the application and page title-->
<StackPanel Grid.Row="0" Margin="12,17,0,28">
<TextBlock Text="PicoSDU" Style="{StaticResource PhoneTextNormalStyle}"/>
<TextBlock Text="Settings" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
</StackPanel>
<!--ContentPanel - place additional content here-->
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<StackPanel Margin="30,0,0,0">
<TextBlock Height="36" HorizontalAlignment="Left" Margin="0,0,0,0" Name="txtIpAddress" Text="IP Address" VerticalAlignment="Top" Width="169" />
<TextBox Name="tbIpAddress" HorizontalAlignment="Left" Margin="0,0,0,0" VerticalAlignment="Top" Width="274"
Text="{Binding Source={StaticResource PicoSettings}, Path=IpSetting, Mode=TwoWay}"/>
<TextBlock Height="36" HorizontalAlignment="Left" Margin="0,0,0,0" Name="txtPort" Text="Port Number" VerticalAlignment="Top" Width="169" />
<TextBox Name="tbPort" HorizontalAlignment="Left" Margin="0,0,0,0" VerticalAlignment="Top" Width="274"
Text="{Binding Source={StaticResource PicoSettings}, Path=PortSetting, Mode=TwoWay}"/>
<TextBlock Height="36" HorizontalAlignment="Left" Margin="0,0,0,0" Name="txtSysId" Text="System ID" VerticalAlignment="Top" Width="169" />
<TextBox Name="tbSysId" HorizontalAlignment="Left" Margin="0,0,0,0" VerticalAlignment="Top" Width="274"
Text="{Binding Source={StaticResource PicoSettings}, Path=SysIdSetting, Mode=TwoWay}"/>
<TextBlock Height="36" HorizontalAlignment="Left" Margin="0,0,0,0" Name="txtWsId" Text="Station ID" VerticalAlignment="Top" Width="169" />
<TextBox Name="tbWsId" HorizontalAlignment="Left" Margin="0,0,0,0" VerticalAlignment="Top" Width="274"
Text="{Binding Source={StaticResource PicoSettings}, Path=WsIdSetting, Mode=TwoWay}"/>
</StackPanel>
</Grid>
</Grid>
</phone:PhoneApplicationPage>
所以，很簡單。四個文本框。它呈現完全確定，直到我只要我補充一點，XAML解析器拋出一個搖擺和根的PhoneApplicationPage變得彎彎曲曲的老藍和報告我們最喜愛的「元素已經是另一個孩子添加的資源條款
<phone:PhoneApplicationPage.Resources>
<local:AppSettings x:Key="PicoSettings"></local:AppSettings>
</phone:PhoneApplicationPage.Resources>
元素「錯誤。如果我刪除了資源子句，那麼該錯誤消失，並且xaml呈現，但是當然，文本框綁定會導致錯誤，因爲他們看不到它們的資源。
我一直在谷歌搜索這最後三個小時，我看不出有什麼問題，並沒有我在這裏和其他地方找到的答案似乎適合。一些善良的靈魂能否向我展示我所做的愚蠢愚蠢的事情，請把我從痛苦中解救出來？
編輯 這裏是AppSettings類。這只是微軟代碼示例，侵入代碼隱藏：
namespace PicoSDU
{
public partial class AppSettings : PhoneApplicationPage
{
// Our settings
IsolatedStorageSettings settings;
// The key names of our settings
const string IpSettingKeyName = "IpSetting";
const string SysIdSettingKeyName = "SysIdSetting";
const string WsIdSettingKeyName = "WsIdSetting";
const string PortSettingKeyName = "PortSetting";
// The default value of our settings
const string IpSettingDefault = "81.179.24.51";
const string SysIdSettingDefault = "1";
const string WsIdSettingDefault = "511";
const string PortSettingDefault = "1846";
public AppSettings()
{
InitializeComponent();
try
{
settings = IsolatedStorageSettings.ApplicationSettings;
}
catch (System.IO.IsolatedStorage.IsolatedStorageException e)
{
// handle exception
}
}
public bool AddOrUpdateValue(string Key, Object value)
{
bool valueChanged = false;
// If the key exists
if (settings.Contains(Key))
{
// If the value has changed
if (settings[Key] != value)
{
// Store the new value
settings[Key] = value;
valueChanged = true;
}
}
// Otherwise create the key.
else
{
settings.Add(Key, value);
valueChanged = true;
}
return valueChanged;
}
public T GetValueOrDefault<T>(string Key, T defaultValue)
{
T value;
// If the key exists, retrieve the value.
if (settings.Contains(Key))
{
value = (T)settings[Key];
}
// Otherwise, use the default value.
else
{
value = defaultValue;
}
return value;
}
public void Save()
{
settings.Save();
}
public string IpSetting
{
get
{
return GetValueOrDefault<string>(IpSettingKeyName, IpSettingDefault);
}
set
{
if (AddOrUpdateValue(IpSettingKeyName, value))
{
Save();
}
}
}
public string SysIdSetting
{
get
{
return GetValueOrDefault<string> (SysIdSettingKeyName, SysIdSettingDefault);
}
set
{
if (AddOrUpdateValue (SysIdSettingKeyName, value))
{
Save();
}
}
}
public string WsIdSetting
{
get
{
return GetValueOrDefault<string> (WsIdSettingKeyName, WsIdSettingDefault);
}
set
{
if (AddOrUpdateValue (WsIdSettingKeyName, value))
{
Save();
}
}
}
public string PortSetting
{
get
{
return GetValueOrDefault<string> (PortSettingKeyName, PortSettingDefault);
}
set
{
if (AddOrUpdateValue (PortSettingKeyName, value))
{
Save();
}
}
}
}
}
這是...奇怪。你可以發佈堆棧跟蹤，也許可以定義'AppSettings'類嗎？ – McGarnagle
是的，首先向我們展示AppSettings類:)即使你得到了搖擺 - 你還可以運行應用程序嗎？你有沒有嘗試重建，關閉和打開解決方案/ VS？ –
問題是UIElement在同一個UI（VisualTree）的兩部分中被重用。我不知道如何使用你的AppSettings類來實現。 Plz發佈其代碼。 – atomaras