WPF用户控件属性在新实例中不更改 [英] WPF User Control Properties Not Changing in New Instance

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问题描述

下面是我的自定义控件的WPF XAML和VB，下面是我在新WPF XAML中的用法，但我发现除非我在用户控件VB中更改它们，否则我无法更改属性。 / p>

这是我第一次这样做，寻找一些积极的反馈和更好的方法来做到这一点


我也有绑定自定义控件的高度和宽度的问题这些似乎没有工作时间


谢谢



我没有在WPF VB中输入最终形式，因为此时它是空的


Madaxe 


< Window 
 xmlns =" http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
 xmlns：x =" http://schemas.microsoft.com/winfx/2006/xaml" 
 xmlns：d =" http://schemas.microsoft.com/expression/blend/2008" 
 xmlns：mc =" http://schemas.openxmlformats.org/markup-compatibility/2006" 
 xmlns：local =" clr-namespace：DataBinding" 
 xmlns：vsc =" clr-namespace：UserControl; assembly = ClockControl"的xmlns：用户控件= QUOT; CLR-名称空间：DataBinding.UserControl" X：类= QUOT;主窗口" 
 mc：Ignorable =" d" 
 Title =" MainWindow"高度= QUOT; 450"宽度= QUOT; 800" 
> 
< Grid> 
< UserControl：ClockControl x：Name =" MyClock" 
 Horizo​​ntalAlignment =" Left" 
 Margin =" 210,119,0,0" 
 VerticalAlignment =" Top" 
 ClockBezelBorderThickness =" 20" 
 ClockBezelBrushColor =" Blue" 
 ClockBezelBackground =" Gray" 
 ClockBezelCornerRadius =" 360" 
 ClockHeight =" 300" 
 ClockWidth =" 300" /> 
< / Grid> 
< / Window> 


< UserControl x：Class =" UserControl.ClockControl" 
 xmlns =" http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
 xmlns：x =" http://schemas.microsoft.com/winfx/2006/xaml" 
 xmlns：mc =" http://schemas.openxmlformats.org/markup-compatibility/2006" 
 xmlns：d =" http://schemas.microsoft.com/expression/blend/2008" 
 xmlns：local =" clr-namespace：DataBinding" 
 mc：Ignorable =" d" 
 DataContext =" {Binding RelativeSource = {RelativeSource Self}}" 
 d：DesignHeight =" {Binding Path = ClockHeight}" 
 d：DesignWidth =" {Binding Path = ClockWidth}" 
 Loaded =" Clock_Loaded" 
背景="透明"> 
 
< Border CornerRadius =" {Binding Path = ClockBezelCornerRadius}" 
 BorderBrush =" {Binding Path = ClockBezelBrushColor}" 
 BorderThickness =" {Binding Path = ClockBezelBorderThickness}" 
 Background =" {Binding Path = ClockBezelBackground}"> 
 
< StackPanel WindowChrome.IsHitTestVisibleInChrome =" True"> 
< Label Foreground =" {Binding Path = ClockTitleFontForeGround}" 
 Margin =" 0,15,0,0" 
 FontSize =" {Binding Path = ClockTitleFontSize}" 
 FontFamily =" {Binding Path = ClockTitleFont}" 
 Horizo​​ntalAlignment =" Center" 
 Content =" {Binding Path = ClockTitle}" /> 
 
< StackPanel Background ="＃3F3F46"余量= QUOT; 0,20,0,5"宽度= QUOT; 280"高度= QUOT; 100"> 
< Label Name =" LBL_Time"余量= QUOT; 0,20,0,0"前景= QUOT;＃FFDF66"字号= QUOT; 40"的FontFamily = QUOT; Stormfaze"的Horizo​​ntalAlignment = QUOT;中心"→10：30：40℃; /标签> 
< / StackPanel> 
< StackPanel Background ="＃3F3F46"宽度= QUOT; 280"高度= QUOT; 50"> 
< Label Name =" LBL_Date"余量= QUOT; 0,8,0,0"前景= QUOT;＃ABA796"字号= QUOT; 20" FontFamily ="Britannic Bold" Horizo​​ntalAlignment =" Center"> Sat 01.05.2018< / Label> 
< / StackPanel> 
< / StackPanel> 
< / Border> 
 
< / UserControl> 


 Imports System.Windows.Threading 
 Namespace UserControl 
 
 Public Class ClockControl 
 
 Private WithEvents _Timer As DispatcherTimer = Nothing 
 
 
 Public Property ClockHeight = 300 
 Public Property ClockWidth = 300 
 
公共财产ClockBezelCornerRadius As Integer = 20 
公共财产ClockBezelBrushColor As String =" Green" 
 Public Property ClockBezelBackground As String =" Yellow" 
 Public Property ClockBezelBorderThickness As Integer = 5 
 
 Public Property ClockTitle As String =" DIGICLOCK" 
 Public Property ClockTitleFont As String =" Stormfaze" 
公共属性ClockTitleFontSize As Integer = 25 
公共属性ClockTitleFontForeGround As String =" Gray" 
 
 Sub New（）
'设计师需要此调用。 
 InitializeComponent（）
'在InitializeComponent（）调用之后添加任何初始化。 
 End Sub 
 
 Private Sub Clock_Loaded（sender As Object，e As RoutedEventArgs）处理Me.Loaded 
 _Timer = New DispatcherTimer 
 _Timer.Interval = TimeSpan.FromSeconds（ 1）
 _Timer.Start（）
 End Sub 
 
 Private Sub Timer_Tick（）处理_Timer.Tick 
 LBL_Time.Content = DateTime.Now.ToLongTimeString 
 LBL_Date.Content = DateTime.Now.ToLongDateString 
 End Sub 
 
 End Class 
 
 End Namespace



在贝鲁特忙碌作为一个砖头

解决方案

您缺少INotifyPropertyChanged的实现。 当您对属性进行更改时，这种机制会告诉UI处理属性的更改。


以下是您需要的一个小示例：

 Imports System.ComponentModel 
 
 Class MainWindow 
 Implements INotifyPropertyChanged 
 
 
 Private _sampleProperty As String 
 
公共属性sampleProperty（）As String 
获取
返回_sampleProperty 
结束获取
设置（ByVal值为字符串）
 _sampleProperty = value 
 RaiseChanged（" sampleProperty"）
 End Set 
 End Property 
 
 Private Sub RaiseChanged（propName As String）
 RaiseEvent PropertyChanged（Me，New PropertyChangedEventArgs（propName） ）
 End Sub 
 
公共事件PropertyChanged As PropertyChangedEventHandler实现INotifyPropertyChanged.PropertyChanged 
 
结束类


 


Below is the WPF XAML and VB for my custom control, also below is my usage in the new WPF XAML but I'm finding that i cant change the properties unless i change them in the user control VB.

This is the first time I've done this, looking for some positive feed back and better ways to do this

I'm also having issues binding the height and width of the custom control these don't seem to work period

Thanks

i didn't put in the WPF VB for the final form since its empty at this point

Madaxe

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:DataBinding"
        xmlns:vsc="clr-namespace:UserControl;assembly=ClockControl" xmlns:UserControl="clr-namespace:DataBinding.UserControl" x:Class="MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"
        >
    <Grid>
        <UserControl:ClockControl x:Name="MyClock"
                                  HorizontalAlignment="Left"                               
                                  Margin="210,119,0,0" 
                                  VerticalAlignment="Top" 
                                  ClockBezelBorderThickness="20"
                                  ClockBezelBrushColor="Blue"
                                  ClockBezelBackground="Grey"
                                  ClockBezelCornerRadius="360"
                                  ClockHeight="300"
                                  ClockWidth="300"/>
    </Grid>
</Window>

<UserControl x:Class="UserControl.ClockControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:DataBinding"
             mc:Ignorable="d"
             DataContext="{Binding RelativeSource={RelativeSource Self}}"
             d:DesignHeight="{Binding Path=ClockHeight}"
             d:DesignWidth="{Binding Path=ClockWidth}"
             Loaded="Clock_Loaded" 
             Background="Transparent">

    <Border CornerRadius="{Binding Path=ClockBezelCornerRadius}" 
            BorderBrush="{Binding Path=ClockBezelBrushColor}" 
            BorderThickness="{Binding Path=ClockBezelBorderThickness}" 
            Background="{Binding Path=ClockBezelBackground}">
        
        <StackPanel WindowChrome.IsHitTestVisibleInChrome="True">
            <Label Foreground="{Binding Path=ClockTitleFontForeGround}" 
                   Margin="0,15,0,0" 
                   FontSize="{Binding Path=ClockTitleFontSize}" 
                   FontFamily="{Binding Path=ClockTitleFont}" 
                   HorizontalAlignment="Center" 
                   Content="{Binding Path=ClockTitle}"/>
            
            <StackPanel Background="#3F3F46" Margin="0,20,0,5" Width="280" Height="100">
                <Label Name="LBL_Time" Margin="0,20,0,0" Foreground="#FFDF66" FontSize="40" FontFamily="Stormfaze" HorizontalAlignment="Center">10:30:40</Label>
            </StackPanel>
            <StackPanel Background="#3F3F46" Width="280" Height="50">
                <Label Name="LBL_Date" Margin="0,8,0,0" Foreground="#ABA796" FontSize="20" FontFamily="Britannic Bold" HorizontalAlignment="Center">Sat 01.05.2018</Label>
            </StackPanel>
        </StackPanel>
    </Border>
    
</UserControl>

Imports System.Windows.Threading
Namespace UserControl

    Public Class ClockControl

        Private WithEvents _Timer As DispatcherTimer = Nothing


        Public Property ClockHeight = 300
        Public Property ClockWidth = 300

        Public Property ClockBezelCornerRadius As Integer = 20
        Public Property ClockBezelBrushColor As String = "Green"
        Public Property ClockBezelBackground As String = "Yellow"
        Public Property ClockBezelBorderThickness As Integer = 5

        Public Property ClockTitle As String = "DIGICLOCK"
        Public Property ClockTitleFont As String = "Stormfaze"
        Public Property ClockTitleFontSize As Integer = 25
        Public Property ClockTitleFontForeGround As String = "Grey"

        Sub New()
            ' This call is required by the designer.
            InitializeComponent()
            ' Add any initialization after the InitializeComponent() call.
        End Sub

        Private Sub Clock_Loaded(sender As Object, e As RoutedEventArgs) Handles Me.Loaded
            _Timer = New DispatcherTimer
            _Timer.Interval = TimeSpan.FromSeconds(1)
            _Timer.Start()
        End Sub

        Private Sub Timer_Tick() Handles _Timer.Tick
            LBL_Time.Content = DateTime.Now.ToLongTimeString
            LBL_Date.Content = DateTime.Now.ToLongDateString
        End Sub

    End Class

End Namespace

As Busy As A Bricky In Beirut

解决方案

You are missing an Implementation of INotifyPropertyChanged.  When you make a change to a property it is this mechanism that tells the UI to deal with changes to properties.

The following is a small example of what you need:

Imports System.ComponentModel

Class MainWindow
    Implements INotifyPropertyChanged


    Private _sampleProperty As String

    Public Property sampleProperty() As String
        Get
            Return _sampleProperty
        End Get
        Set(ByVal value As String)
            _sampleProperty = value
            RaiseChanged("sampleProperty")
        End Set
    End Property

    Private Sub RaiseChanged(propName As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propName))
    End Sub

    Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged

End Class

 


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