小编Ray*_*ink的帖子

我的代码更改属性不起作用,我完全不知道什么是错的,但也许你这样做.

这是我的代码的简化示例,它重现了错误.这是我的Xaml代码:

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <Button x:Name="MyButton"
            Height="100" 
            Width="300" 
            Content="Click" 
            FontSize="40" 
            FontWeight="Bold" 
            VerticalAlignment="Center" 
            HorizontalAlignment="Center" 
            Background="Red" Click="MyButton_Click"/>
</Grid>
<VisualStateManager.VisualStateGroups>
    <VisualStateGroup>
        <VisualState x:Name="Blue">
            <Storyboard>
                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="MyButton"
                                               Storyboard.TargetProperty="Background">
                    <DiscreteObjectKeyFrame KeyTime="0" Value="Aqua"/>
                </ObjectAnimationUsingKeyFrames>
            </Storyboard>
        </VisualState>
    </VisualStateGroup>
</VisualStateManager.VisualStateGroups>

这是Code-Behind:

public sealed partial class MainPage : Page
{
    public MainPage()
    {
        this.InitializeComponent();
    }

    private void MyButton_Click(object sender, RoutedEventArgs e)
    {
        VisualStateManager.GoToState(this, "Blue", true);
    }
}

理论上,这应该在点击时将Button-Color更改为"Aqua",但没有任何反应.

我需要将sql-table与DataTable(这是SQL表的修改副本)中的数据同步.我想更新/删除/插入差异,所以我需要比较两者并找到查询值(在我的案例ID中)和更改类型.有没有一种有效的方法,也许是通过一些预设的方法？我希望尽可能少访问.

我需要格式化UWP-DatePicker.我想得到的是一个常见的DatePicker,它适合在网格中.

以下是我在GridColumn中嵌入DatePicker的方法:

<Grid Grid.Row="1" Grid.Column="1">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
        <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
    <DatePicker Grid.Column="0"
                HorizontalAlignment="Left"
                MonthFormat="{}{month.abbreviated(3)}" 
                Date="{Binding AppointmentStartDateProxy, Mode=TwoWay}" 
                DateChanged="DatePicker_DateChanged" 
                Style="{StaticResource DatePickerStyle1}"> 
        <DatePicker.IsEnabled>
            <Binding Path="Closed" Converter="{StaticResource negationConverter}"/>
        </DatePicker.IsEnabled>
    </DatePicker>
</Grid>

以下是StyleTemplate的"关键"更改:

<Style x:Key="DatePickerStyle1" TargetType="DatePicker">
    <.../>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="DatePicker">
                <StackPanel x:Name="LayoutRoot" Margin="{TemplateBinding Padding}" HorizontalAlignment="Stretch" >
                    <ContentPresenter x:Name="HeaderContentPresenter"
                                      x:DeferLoadStrategy="Lazy"
                                      Visibility="Collapsed"
                                      Content="{TemplateBinding Header}"
                                      ContentTemplate="{TemplateBinding HeaderTemplate}"
                                      Margin="0,0,0,8"
                                      Foreground="{ThemeResource SystemControlForegroundBaseHighBrush}"
                                      AutomationProperties.AccessibilityView="Raw" />
                    <Button x:Name="FlyoutButton"
                            HorizontalAlignment="Left"
                            Style="{StaticResource DatePickerFlyoutButtonStyle}"
                            Foreground="{TemplateBinding Foreground}"
                            Background="{TemplateBinding Background}"
                            IsEnabled="{TemplateBinding IsEnabled}"
                            HorizontalContentAlignment="Stretch" />

设置Style.Setter.Value.ControlTemplate.StackPanel.Button.Horizo​​ntalAlignment ="Left"时,我的DatePicker不会填充其父控件:

设置Style.Setter.Value.ControlTemplate.StackPanel.Button.Horizo​​ntalAlignment ="Strech"时,我的DatePicker与其父控件重叠:

当我将StyleTemplates LayoutRoot从StackPanel更改为Grid时,此行为也保持不变.

根据我的理解,RootLayout-Control应该从包含DatePicker的Grid继承它的大小,而Button应该从RootLayout获得它的大小,结果是在我的GridColumn中.

编辑:

当仅将DatePickers …

我需要从TimePicker-Controll Flyout中删除底部按钮.这种风格做到了,但我无法看到魔法发生在哪里:

<Style x:Key="TimePickerStyle1" TargetType="TimePicker">
    <Setter Property="IsTabStop" Value="False" />
    <Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}" />
    <Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}" />
    <Setter Property="Foreground" Value="{ThemeResource TimePickerForegroundThemeBrush}" />
    <Setter Property="HorizontalAlignment" Value="Left" />
    <Setter Property="VerticalAlignment" Value="Center" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="TimePicker">
                <Border x:Name="LayoutRoot"
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="0">
                    <Grid Margin="{TemplateBinding Padding}">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="Auto" />
                            <RowDefinition Height="Auto" />
                        </Grid.RowDefinitions>
                        <ContentPresenter x:Name="HeaderContentPresenter"
                                          Content="{TemplateBinding Header}"
                                          ContentTemplate="{TemplateBinding HeaderTemplate}"
                                          FlowDirection="{TemplateBinding FlowDirection}"
                                          FontWeight="{ThemeResource TimePickerHeaderThemeFontWeight}"
                                          Foreground="{ThemeResource TimePickerHeaderForegroundThemeBrush}" />
                        <StackPanel Grid.Row="1"
                                    Margin="0,0,47,0"
                                    Background="#FFFBFBFB"
                                    Orientation="Horizontal">
                            <Border x:Name="FirstPickerHost" BorderBrush="#FFFBFBFB">
                                <ComboBox x:Name="HourPicker"
                                          MinWidth="50"
                                          Background="#FFFBFBFB" …

我想将 XDocument 转换为一个类。通常我使用 xsd-tool 创建我的类，但它似乎在 windows-phone-8 中不受支持。那么最常用的方法是什么，特别是如果我不需要原始 XDocument 中的所有信息？

这是我原来的 xml：

<?xml version="1.0" encoding="UTF-8"?>
<data>
    <request>
        <type>City</type>
        <query>Frankfurt, Germany</query>
    </request>
    <current_condition>
        <observation_time>02:37 PM</observation_time>
        <temp_C>17</temp_C>
        <temp_F>63</temp_F>
        <weatherCode>116</weatherCode>
        <weatherIconUrl>
            <![CDATA[http://cdn.worldweatheronline.net/images/wsymbols01_png_64/wsymbol_0002_sunny_intervals.png]]>
        </weatherIconUrl>
        <weatherDesc>
            <![CDATA[Partly Cloudy ]]>
        </weatherDesc>
        <windspeedMiles>7</windspeedMiles>
        <windspeedKmph>11</windspeedKmph>
        <winddirDegree>270</winddirDegree>
        <winddir16Point>W</winddir16Point>
        <precipMM>0.1</precipMM>
        <humidity>83</humidity>
        <visibility>10</visibility>
        <pressure>1009</pressure>
        <cloudcover>50</cloudcover>
    </current_condition>
    <weather>
        <date>2014-10-14</date>
        <tempMaxC>19</tempMaxC>
        <tempMaxF>67</tempMaxF>
        <tempMinC>9</tempMinC>
        <tempMinF>48</tempMinF>
        <windspeedMiles>7</windspeedMiles>
        <windspeedKmph>12</windspeedKmph>
        <winddirection>SSW</winddirection>
        <winddir16Point>SSW</winddir16Point>
        <winddirDegree>203</winddirDegree>
        <weatherCode>113</weatherCode>
        <weatherIconUrl>
            <![CDATA[http://cdn.worldweatheronline.net/images/wsymbols01_png_64/wsymbol_0001_sunny.png]]>
        </weatherIconUrl>
        <weatherDesc>
            <![CDATA[Sunny]]>
        </weatherDesc>
        <precipMM>0.4</precipMM>
    </weather>
    <weather>
        <date>2014-10-15</date>
        <tempMaxC>19</tempMaxC>
        <tempMaxF>67</tempMaxF>
        <tempMinC>12</tempMinC>
        <tempMinF>53</tempMinF>
        <windspeedMiles>7</windspeedMiles>
        <windspeedKmph>12</windspeedKmph>
        <winddirection>SW</winddirection>
        <winddir16Point>SW</winddir16Point>
        <winddirDegree>233</winddirDegree>
        <weatherCode>113</weatherCode>
        <weatherIconUrl>
            <![CDATA[http://cdn.worldweatheronline.net/images/wsymbols01_png_64/wsymbol_0001_sunny.png]]>
        </weatherIconUrl>
        <weatherDesc> …

我有一个LINQ查询,如下所示:

var query = from produkt in Entity.ProduktCollection.produktCollection
            let p = produkt as Entity.Produkt

            from version in p.version
            let v = version as Entity.Version

            from customer in v.customerCollection
            let c = customer as Entity.Customer

            from fehler in v.fehlerCollection
            let f = fehler as Entity.Fehler

            where f.id == GetGuid();
            select p;

但我真正需要的是一种方法来使f加号属性和p变量,所以我可以将它们更改为其他所有可能的组合,例如:

where c.name == "frank"
select f;

要么

where p.id == GetGuid2()
select c;

有没有办法实现这个目标？据我所知,无法在from/ let-part和where/ select-part 之间的查询中插入switch-case块.

我想创建一个具有多个状态的类对象,每次只能有一个状态.例如:

班级飞机有三个条件:飞行,驾驶,站立

我喜欢这样的条件:

Plane boeing747 = new Plane;

boeing747.State = flying

要么

boeing747.State.flying = true;

if(boeing747.State.flying == true); 
    console.writeline("it flyes");
else if(boeing747.State.driving == true)
    console.writeline("it drives");
else
    console.writeline("nothing goes");
// console reads: "it flyes"

boeing747.State.driving = true;
if(boeing747.State.flying == true); 
    console.writeline("it flyes");
else if(boeing747.State.driving == true)
    console.writeline("it drives");
else
    console.writeline("nothing goes");
// console reads: "it drives"