如何从 WPF 后面的代码访问 XAML 按钮

【问题标题】：How to access XAML button from code behind WPF如何从 WPF 后面的代码访问 XAML 按钮
【发布时间】：2017-02-09 03:28:26
【问题描述】：

我的代码：

<DataGrid  HorizontalAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Hidden"  BorderBrush="#83D744" IsSynchronizedWithCurrentItem="False" VerticalGridLinesBrush="Transparent" Grid.Column="0"   RowHeaderWidth="0" CanUserAddRows="False" AutoGenerateColumns="False"  x:Name="datagrid1" Margin="10,150,8,50" Background="Transparent" RowBackground="#FF494949"  VerticalContentAlignment="Center" HorizontalContentAlignment="Center" ItemsSource="{Binding}">
    <DataGrid.Resources>
        <Style TargetType="{x:Type DataGridColumnHeader}">
            <Setter Property="Background" Value="#83D744"/>
            <Setter Property="Opacity" Value="1"/>
            <Setter Property="Foreground" Value="White"/>
            <Setter Property="HorizontalContentAlignment" Value="Center" />
            <Setter Property="FontSize" Value="18"/>
            <Setter Property="FontFamily" Value="Arial"/>
            <Setter Property="Height" Value="50"/>
        </Style>


<Style x:Key="TextInCellCenter" TargetType="{x:Type TextBlock}" >
    <Setter Property="TextAlignment" Value="Center"/>
</Style>
<Style TargetType="{x:Type TextBlock}" x:Key="RightAligElementStyle">
    <Setter Property="TextAlignment" Value="Right"/>
</Style>
<Style TargetType="{x:Type TextBlock}" x:Key="LeftAligElementStyle">
    <Setter Property="TextAlignment" Value="Left"/>
</Style>
<SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" 
           Color="Transparent"/>
</DataGrid.Resources>


<DataGrid.Columns >
    <DataGridTextColumn Binding="{Binding ProductName}"     ElementStyle="{StaticResource LeftAligElementStyle}"     Header="NAZIV ARTIKLA" MinWidth="350"    Foreground="White" FontSize="20" FontFamily="Verdana" />
    <DataGridTextColumn Binding="{Binding Quantity}"        ElementStyle="{StaticResource TextInCellCenter}"         Header="KOLIČINA"   MinWidth="200" Foreground="White"      FontSize="20" FontFamily="Verdana" />
</DataGrid.Columns>

<DataGrid.GroupStyle>
    <!-- Style for groups at top level. -->
    <GroupStyle>
        <GroupStyle.ContainerStyle>
            <Style TargetType="{x:Type GroupItem}">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type GroupItem}">
                            <Expander IsExpanded="True"  Background="Black" Opacity="0.7">
                                <Expander.Header >
                                    <DockPanel Height="50" Margin="0,0,0,0"  Name="dockPanel" Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGrid}}, Path=ActualWidth}">

                                        <Button Name="btnFinishOrder" Content="Finish Order" Margin="0,0,55,5" DockPanel.Dock="Right" Click="btnFinishOrder_Click" FontSize="12" BorderThickness="1.5" HorizontalAlignment="Left"  VerticalAlignment="Bottom"  HorizontalContentAlignment="Center" VerticalContentAlignment="Center"  Foreground="#83D744"  Background="Transparent"  BorderBrush="#83D744" Width="130"   Height="40">
                                             <Button.Template>
                                                <ControlTemplate TargetType="Button">
                                                <Border BorderThickness="{TemplateBinding BorderThickness}"
                                                        BorderBrush=    "{TemplateBinding BorderBrush}"
                                                        Background=     "{TemplateBinding Background}">
                                                        <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                                                </Border>
                                                </ControlTemplate>
                                             </Button.Template>
                                         </Button>

                                         <Button Name="btnTakeIt" Click="btnTakeIt_Click"  Content="Take it" Margin="0,0,20,5" DockPanel.Dock="Right" FontSize="12" BorderThickness="1.5" HorizontalAlignment="Left"  VerticalAlignment="Bottom"  HorizontalContentAlignment="Center" VerticalContentAlignment="Center"  Foreground="#83D744"  Background="Transparent"  BorderBrush="#83D744" Width="130"   Height="40">
                                             <Button.Template>
                                                <ControlTemplate TargetType="Button">
                                                <Border BorderThickness="{TemplateBinding BorderThickness}"
                                                        BorderBrush="{TemplateBinding BorderBrush}"
                                                        Background="{TemplateBinding Background}">
                                                        <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                                                </Border>
                                                </ControlTemplate>
                                             </Button.Template>
                                        </Button>
                                        <TextBlock FontWeight="Normal" FontFamily="Verdana" FontSize="20" Height="25" Foreground="#83D744" Text="{Binding Path=Name,StringFormat= Number of Order:# {0}}" />

                                    </DockPanel>
                                </Expander.Header>
                                <Expander.Content>
                                    <ItemsPresenter />
                                </Expander.Content>
                            </Expander>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </GroupStyle.ContainerStyle>
    </GroupStyle>
</DataGrid.GroupStyle>

你们可以看到，当我点击按钮 Click="btnTakeIt_Click" 时，我会以编程方式将按钮文本更改为“订单进行中”。我将数据库中的字段 IsInProgres 更新为 1 - 是的，代码在这里：

 private void btnTakeIt_Click(object sender, RoutedEventArgs e)
    {
        Button b = sender as Button;

        CollectionViewGroup group = b.DataContext as CollectionViewGroup;
        var x = group.Name;
        int orderNumber = Convert.ToInt32(x);

        b.BorderBrush = null;
        b.Content = "Order is in progress";
        b.FontSize = 12;

        OrdersController.SetOrderInProgressByID(orderNumber);

    }

但是发生了什么，因为我每 20 秒刷新一次我的网格，我的按钮内容又变成了默认的“接受它！”因为那是用 XAML 编写的。

像这样：

这是我的代码（每隔几秒刷新一次）：

 public MainWindow()
{
    try
    {


        InitializeComponent();


        this.WindowStartupLocation = WindowStartupLocation.CenterScreen;
        this.WindowState = WindowState.Maximized;

        var ordersList = OrdersController.localOrders();


        collectionViewSource.Source = ordersList;
        collectionViewSource.GroupDescriptions.Add(new PropertyGroupDescription("NumberOfOrder"));
        DataContext = collectionViewSource;

        DispatcherTimer timer = new DispatcherTimer();
        timer.Interval = TimeSpan.FromSeconds(20);
        timer.Tick += timer_Tick;
        timer.Start();

    }
    catch(Exception ex)
    {
        MessageBox.Show(ex.Message);
    }

}

void timer_Tick(object sender, EventArgs e)
{

    var ordersList = OrdersController.localOrders();
    collectionViewSource.Source = null;
    collectionViewSource.Source = ordersList;

    DataContext = collectionViewSource;

    datagrid1.ScrollIntoView(datagrid1.Items[datagrid1.Items.Count - 1]);
}

}

所以我的问题是我能否以某种方式循环我的 localOrders 并检查 NumberOfOrder 是否有 IsInProgress = 1 并简单地设置：

btnTakeIt.Content="Order in progress.."

因此，每次刷新网格时，我都可以循环我的订单，并检查订单InProgress，然后我可以将按钮 btnTakeIt 内容设置为“订单进行中..”

或者如果有其他方法，我也愿意尝试！

P.S 我已经尝试过了，但我的 btnTakeIt 在后面的代码中无法访问:(

编辑：

 void timer_Tick(object sender, EventArgs e)
    {
        Button MyButton = FindChild<Button>(datagrid1, "btnTakeIt");

        var ordersList = OrdersController.localOrders();
        collectionViewSource.Source = null;
        collectionViewSource.Source = ordersList;
        foreach (var item in ordersList)
        {
            if (item.IsInProgress== true)
            {
                MyButton.Content = "Order is in progress";
            }
        }

        DataContext = collectionViewSource;


    }

我可以这样做吗？我检查了调试器，它正在进入 if 语句内部，当我查看断点时，它实际上会更改内容，但在网格上我看不到任何更改:(

编辑：

我必须提到我的类 Product 包含在我的 OrdersController 中:)

@Ayuman 您对此有何看法：

<Button Name="btnTakeIt"   DataContext="{Binding Items[0]}" Content="{Binding Status}"Click="btnTakeIt_Click"  Content="Take it" Margin="0,0,20,5" DockPanel.Dock="Right" FontSize="12" BorderThickness="1.5" HorizontalAlignment="Left"  VerticalAlignment="Bottom"  HorizontalContentAlignment="Center" VerticalContentAlignment="Center"  Foreground="#83D744"  Background="Transparent"  BorderBrush="#83D744" Width="130"   Height="40">
                                         <Button.Template>
                                            <ControlTemplate TargetType="Button">
                                            <Border BorderThickness="{TemplateBinding BorderThickness}"
                                                    BorderBrush="{TemplateBinding BorderBrush}"
                                                    Background="{TemplateBinding Background}">
                                                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                                            </Border>
                                            </ControlTemplate>
                                         </Button.Template>
                                    </Button>

后面的代码：

 public static List<LocalOrders> localOrders()
    {
        var results = DataServices.POS.proc_GetAllOrders().ToList();


        List<LocalOrders> localOrdersList = new List<LocalOrders>();

        foreach (var item in results)
        {
            LocalOrders lokal = new LocalOrders();
            if (item.IsInProgress)
            {
                localo.Pihvacena = true;
                localo.Status = "IN PROCESS";
            }
            else
            {
                lokalne.Status = "IT IS NOT YET IN PROCESS";
            }


            lokal.User = item.User;
            lokal.Quantity = Convert.ToInt32(item.Quantity);
            lokal.Title = item.Title;
            lokal.NumberOfOrder = item.NumberOfOrder;
            localOrdersList.Add(lokal);
        }
        return localOrdersList;
    }

所以我可以以编程方式检查订单状态并设置按钮的内容......这可能是一个好的解决方案吗？

【问题讨论】：

  • 您可以使用帖子中建议的方法遍历可视化树。 stackoverflow.com/questions/16997951/…
  • @Ayyappan Subramanian 我从你的链接中编辑了以下帖子，你能看看编辑伙伴吗，我可能做错了什么，我找到了按钮和它的内容，但我不能改变它大大地。检查编辑老兄
  • 我认为您没有更改文本，文本都显示“订单正在进行中”。
  • @AyyappanSubramanian 那么我该怎么办？ :) 非常感谢
  • @AyyappanSubramanian 我用不同的文本进行了测试，没有发生任何事情，也许我在那里做错了什么......

标签： wpf button datagrid window dockpanel


【解决方案1】：

请参考以下代码。我试图让它工作。希望这对你也有用

 <DataGrid  HorizontalAlignment="Stretch" ScrollViewer.HorizontalScrollBarVisibility="Hidden"  BorderBrush="#83D744" IsSynchronizedWithCurrentItem="False" VerticalGridLinesBrush="Transparent" Grid.Column="0"   RowHeaderWidth="0" CanUserAddRows="False" AutoGenerateColumns="False"  x:Name="datagrid1" Margin="10,150,8,50" Background="Transparent" RowBackground="#FF494949"  VerticalContentAlignment="Center" HorizontalContentAlignment="Center" ItemsSource="{Binding}">
        <DataGrid.Resources>
            <Style TargetType="{x:Type DataGridColumnHeader}">
                <Setter Property="Background" Value="#83D744"/>
                <Setter Property="Opacity" Value="1"/>
                <Setter Property="Foreground" Value="White"/>
                <Setter Property="HorizontalContentAlignment" Value="Center" />
                <Setter Property="FontSize" Value="18"/>
                <Setter Property="FontFamily" Value="Arial"/>
                <Setter Property="Height" Value="50"/>
            </Style>


            <Style x:Key="TextInCellCenter" TargetType="{x:Type TextBlock}" >
                <Setter Property="TextAlignment" Value="Center"/>
            </Style>
            <Style TargetType="{x:Type TextBlock}" x:Key="RightAligElementStyle">
                <Setter Property="TextAlignment" Value="Right"/>
            </Style>
            <Style TargetType="{x:Type TextBlock}" x:Key="LeftAligElementStyle">
                <Setter Property="TextAlignment" Value="Left"/>
            </Style>
            <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" 
       Color="Transparent"/>
        </DataGrid.Resources>


        <DataGrid.Columns >
            <DataGridTextColumn Binding="{Binding ProductName}"     ElementStyle="{StaticResource LeftAligElementStyle}"     Header="NAZIV ARTIKLA" MinWidth="350"    Foreground="White" FontSize="20" FontFamily="Verdana" />
            <DataGridTextColumn Binding="{Binding Quantity}"        ElementStyle="{StaticResource TextInCellCenter}"         Header="KOLIČINA"   MinWidth="200" Foreground="White"      FontSize="20" FontFamily="Verdana" />
        </DataGrid.Columns>

        <DataGrid.GroupStyle>
            <!-- Style for groups at top level. -->
            <GroupStyle>
                <GroupStyle.Panel>
                    <ItemsPanelTemplate>
                        <DataGridRowsPresenter/>
                    </ItemsPanelTemplate>
                </GroupStyle.Panel>
                <GroupStyle.ContainerStyle>
                    <Style TargetType="{x:Type GroupItem}">
                        <Setter Property="Template">
                            <Setter.Value>
                                <ControlTemplate TargetType="{x:Type GroupItem}">
                                    <Expander IsExpanded="True"  Background="Black" Opacity="0.7">
                                        <Expander.Header >
                                            <DockPanel Height="50" Margin="0,0,0,0"  Name="dockPanel" Width="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGrid}}, Path=ActualWidth}">

                                                <Button Name="btnFinishOrder" DataContext="{Binding Items[0]}" Content="{Binding ButtonCaption}" Margin="0,0,55,5" DockPanel.Dock="Right" Click="BtnFinishOrder_OnClick" FontSize="12" BorderThickness="1.5" HorizontalAlignment="Left"  VerticalAlignment="Bottom"  HorizontalContentAlignment="Center" VerticalContentAlignment="Center"  Foreground="#83D744"  Background="Transparent"  BorderBrush="#83D744" Width="130"   Height="40">
                                                    <Button.Template>
                                                        <ControlTemplate TargetType="Button">
                                                            <Border BorderThickness="{TemplateBinding BorderThickness}"
                                                    BorderBrush=    "{TemplateBinding BorderBrush}"
                                                    Background=     "{TemplateBinding Background}">
                                                                <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                                                            </Border>
                                                        </ControlTemplate>
                                                    </Button.Template>
                                                </Button>

                                                <Button Name="btnTakeIt" Click="BtnTakeIt_OnClick"  DataContext="{Binding Items[0]}" Content="{Binding ButtonCaption}" Margin="0,0,20,5" DockPanel.Dock="Right" FontSize="12" BorderThickness="1.5" HorizontalAlignment="Left"  VerticalAlignment="Bottom"  HorizontalContentAlignment="Center" VerticalContentAlignment="Center"  Foreground="#83D744"  Background="Transparent"  BorderBrush="#83D744" Width="130"   Height="40">
                                                    <Button.Template>
                                                        <ControlTemplate TargetType="Button">
                                                            <Border BorderThickness="{TemplateBinding BorderThickness}"
                                                    BorderBrush="{TemplateBinding BorderBrush}"
                                                    Background="{TemplateBinding Background}">
                                                                <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                                                            </Border>
                                                        </ControlTemplate>
                                                    </Button.Template>
                                                </Button>
                                                <TextBlock FontWeight="Normal" FontFamily="Verdana" FontSize="20" Height="25" Foreground="#83D744" Text="{Binding Items[0].ProductName}" />

                                            </DockPanel>
                                        </Expander.Header>
                                        <Expander.Content>
                                            <ItemsPresenter />
                                        </Expander.Content>
                                    </Expander>
                                </ControlTemplate>
                            </Setter.Value>
                        </Setter>
                    </Style>
                </GroupStyle.ContainerStyle>
            </GroupStyle>
        </DataGrid.GroupStyle>
        </DataGrid>

public partial class MainWindow : Window
{
    private ICollectionView view;
    private ObservableCollection<Product> ordersList;
    public MainWindow()
    {
        InitializeComponent();
        this.WindowStartupLocation = WindowStartupLocation.CenterScreen;
        this.WindowState = WindowState.Maximized;

        ordersList = new ObservableCollection<Product>()
        {
            new Product()
            {
                ProductName = "Prodct",
                Quantity = 1,
                NumberOfOrder = 100,
                IsInProgress = true,
                ButtonCaption = "Take it"
            },
            new Product()
            {
                ProductName = "Prodct1",
                Quantity = 2,
                NumberOfOrder = 1000,
                ButtonCaption = "Take it"

            },
            new Product()
            {
                ProductName = "Prodct2",
                Quantity = 3,
                NumberOfOrder = 10000,
                ButtonCaption = "Take it"

            },
            new Product()
            {
                ProductName = "Prodct3",
                Quantity = 4,
                NumberOfOrder = 100000,
                ButtonCaption = "Take it"

            },
        };

        view = CollectionViewSource.GetDefaultView(ordersList);

        view.GroupDescriptions.Add(new PropertyGroupDescription("NumberOfOrder"));
        DataContext = view;

        DispatcherTimer timer = new DispatcherTimer();
        timer.Interval = TimeSpan.FromSeconds(20);
        timer.Tick += Timer_Tick; ;
        timer.Start();
    }

    private void Timer_Tick(object sender, EventArgs e)
    {
        foreach (var item in ordersList)
        {
            if (item.IsInProgress)
            {
                item.ButtonCaption = "Order is Still in progress";
            }
        }
    }

    private void BtnFinishOrder_OnClick(object sender, RoutedEventArgs e)
    {
        throw new NotImplementedException();
    }

    private void BtnTakeIt_OnClick(object sender, RoutedEventArgs e)
    {
        Button b = sender as Button;

        Product prod = b.DataContext as Product;

        b.BorderBrush = null;
        prod.ButtonCaption = "Order is in progress";
        b.FontSize = 12;
    }
}

class Product:INotifyPropertyChanged
{
    private string productName;

    public string ProductName
    {
        get { return productName ; }
        set
        {
            productName = value ;
            OnPropertyChanged("ProductName");
        }
    }

    private int quantity;

    public int Quantity
    {
        get { return quantity; }
        set
        {
            quantity = value;
            OnPropertyChanged("Quantity");
        }
    }

    public int NumberOfOrder { get; set; }

    public bool IsInProgress { get; set; }

    private string buttonCaption;

    public string ButtonCaption
    {
        get { return buttonCaption; }
        set
        {
            buttonCaption = value;
            OnPropertyChanged("ButtonCaption");
        }
    }


    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

【讨论】：

  • 伙计我明天给你回复，已经检查过了，明天我会实施它并让你回复它是否有效。 + 我需要实现 PropertyChangedEventHandler 和 OnPropertyChanged 方法吗？我都需要吗？
  • 修改了我的属性更改通知。立即查看
猜你喜欢
  • 1970-01-01
  • 2021-01-13
  • 1970-01-01
  • 2015-10-19
  • 1970-01-01
  • 2020-01-11
  • 1970-01-01
  • 1970-01-01
  • 1970-01-01
相关资源
最近更新 更多
热门标签
Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode