Question

所以我正在编写一个应用程序，它（现在）有一个用户控件，我正在对其他一些元素进行分组。我想在用户控件中的属性更改时更新视图。我试图实现Inotify，它似乎有效（我在主要形式中以相同的方式完成它，那里很好）。还试图在XAML中设置绑定但不能以某种方式通过它。我猜我必须实现一个路由事件，但我不确定在这种情况下是否以及如何。

我注意到我可以从OnPropertyChanged方法中删除一些内容，但如果我想删除现在未分配的相应事件，则表明我没有实现INotify。

来自用户控件的

XAML：

<UserControl x:Class="Tool_WPF.frmLogin"
         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:Fever_Tool_WPF"
         mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300">

<Grid>
    <StackPanel>
        <Label Name="labLogin" HorizontalAlignment="Center" MaxWidth="150">
            <Style>
                <Style.Triggers>
                    <DataTrigger Binding="{Binding Path=LoginState, ElementName=labLogin}" Value="1">
                        <Setter Property="Label.Content" Value="Success"/>
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </Label>
        <Label HorizontalAlignment="Center">Forum username</Label>
        <TextBox x:Name="tbUser" Width="150"></TextBox>
        <Label HorizontalAlignment="Center">Forum password</Label>
        <PasswordBox x:Name="tbPassword" Width="150"></PasswordBox>
        <Button x:Name="cmdLogin" HorizontalAlignment="Center" Margin="10" Width="150" Click="cmdLogin_Click">Login</Button>
    </StackPanel>
</Grid>

用户控件（属性类）的代码背后

        public class StateLogin : INotifyPropertyChanged
    {
        private int _loginState; // helping variable to trigger login state change

        public event PropertyChangedEventHandler PropertyChanged;

        public int LoginState
        {
            get { return _loginState; }
            set
            {
                _loginState = value;
                OnPropertyChanged("LoginState");
            }
        }

        protected void OnPropertyChanged(string name)
        {
            new PropertyChangedEventArgs(name);
        }
    }

一些主窗口XAML代码

<RibbonWindow
    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:Fever_Tool_WPF"
    xmlns:Primitives="clr-namespace:System.Windows.Controls.Ribbon.Primitives;assembly=System.Windows.Controls.Ribbon" x:Class="Fever_Tool_WPF.MainWindow"
    mc:Ignorable="d"
    Title="MainWindow" Height="589" Width="896"
    Initialized="MainWindow_Initialized">

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition/>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <Ribbon x:Name="ribbonMain">
        <Ribbon.HelpPaneContent>
            <RibbonButton SmallImageSource="Icons/MainWindow/help.ico"/>
        </Ribbon.HelpPaneContent>
        <Ribbon.QuickAccessToolBar>
            <RibbonQuickAccessToolBar/>
        </Ribbon.QuickAccessToolBar>
        <Ribbon.ApplicationMenu>
            <RibbonApplicationMenu SmallImageSource="Icons/MainWindow/BlogHomePage.ico">
                <RibbonApplicationMenuItem Header="Information" ImageSource="Icons/MainWindow/Info.ico" Click="RibInfo_Click"/>
            </RibbonApplicationMenu>
        </Ribbon.ApplicationMenu>
        <RibbonTab x:Name="rLogin" Header="Login" Visibility="Visible"/>
        <RibbonTab x:Name="rMPL" Header="MPL"/>
    </Ribbon>


    <local:frmLogin x:Name="frmLogin" Margin="10, 10, 10, 10" VerticalAlignment="Center" HorizontalAlignment="Center" Grid.Row="1" Visibility="Visible"/>


    <StatusBar DockPanel.Dock="Bottom" MinHeight="10" MaxHeight="20" Grid.Row="2">
        <StatusBarItem DockPanel.Dock="Right">
            <Image>
                <Image.Style>
                    <Style>
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding Ping}" Value="false">
                                <Setter Property="Image.Source" Value="Icons/MainWindow/StatusOffline_stop_32x.png"/>
                                <Setter Property="Image.ToolTip" Value="Can't ping the server."/>
                            </DataTrigger>
                            <DataTrigger Binding="{Binding Ping}" Value="true">
                                <Setter Property="Image.Source" Value="Icons/MainWindow/StatusOK_32x.png"/>
                                <Setter Property="Image.ToolTip" Value="Successfully pinged the server."/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </Image.Style>
            </Image>
        </StatusBarItem>
    </StatusBar>
</Grid>

如上所述，我想我在路由上有点遗漏（根本没有路由^^），有人对此有所了解吗？

Answer 1

将您的StateLogin - 班级更改为

public class StateLogin : INotifyPropertyChanged
    {
        private int _loginState; // helping variable to trigger login state change

        public event PropertyChangedEventHandler PropertyChanged;

        public int LoginState
        {
            get { return _loginState; }
            set
            {
                _loginState = value;
                OnPropertyChanged("LoginState");
            }
        }

        protected void OnPropertyChanged(string name)
        {
            this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
        }
    }

你必须告诉你的事件，它应该实际发射。

修改

假设您的DataContext和其他所有内容都设置正确，您应该尝试使用UserControl：

<UserControl x:Class="Tool_WPF.frmLogin" 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" mc:Ignorable="d" x:Name="LoginRoot" d:DesignHeight="300" d:DesignWidth="300"> <Grid> <StackPanel> <TextBlock Name="labLogin" HorizontalAlignment="Center" MaxWidth="150"> <TextBlock.Style> <Style TargetType="TextBlock"> <Style.Triggers> <DataTrigger Binding="{Binding ElementName=LoginRoot, Path=DataContext.LoginState}" Value="1"> <Setter Property="Text" Value="Success"/> </DataTrigger> </Style.Triggers> </Style> </TextBlock.Style> </TextBlock> <Label HorizontalAlignment="Center">Forum username</Label> <TextBox x:Name="tbUser" Width="150"></TextBox> <Label HorizontalAlignment="Center">Forum password</Label> <PasswordBox x:Name="tbPassword" Width="150"></PasswordBox> <Button x:Name="cmdLogin" HorizontalAlignment="Center" Margin="10" Width="150" Click="cmdLogin_Click">Login</Button> </StackPanel> </Grid> </UserControl>

不需要标签，因为您只使用一些文字。另外，我建议您深入了解XAML的工作原理。将样式作为内容放置永远不是一个好主意。

希望这会让你更进一步。干杯

从用户控件到MainForm的C＃WPF路由事件

1 个答案: