在设置的VisualBrush运行时图像用C＃ [英] Set image runtime in VisualBrush with c#

问题描述

其实我设置为从资源的图像了在设计时进 XAML 文件是这样的：

actually I set an image took from the resources at designtime into the xaml file like this:

<Button Click="btnLogin_Click" Name="btnLogin">
    <StackPanel Orientation="Horizontal">
        <Rectangle Width="20" Height="20" Name="recLogin">
            <Rectangle.Resources>
                <SolidColorBrush x:Key="BlackBrush" Color="White" />
            </Rectangle.Resources>
            <Rectangle.Fill>
                <VisualBrush Stretch="Fill" Visual="{StaticResource appbar_user}" x:Name="brushLogin" />
            </Rectangle.Fill>
        </Rectangle>
        <TextBlock Text=" login" Name="txbLogin" />
    </StackPanel>
</Button>

和正常工作。但是的（是登录按钮）的我想，当用户执行登录时，图像上的按钮的（矩形内）的将被改变。

and works fine. But (is a login button) I wish that when the user do a login, the image on the button (inside a rectangle) will be changed..

我该怎么办？

推荐答案

您可以使用 DataTrigger 来改变图像时，属性更新在你的模型。

You can use a DataTrigger to change the image when a property updates in your model.

在这个例子中，布尔值 IsLoggedIn 被改变从而改变图像

In this example the boolean value IsLoggedIn is changed which in turn changes the image.

例如：

XAML中：

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="125.078" Width="236.441" Name="UI" >
    <Window.Resources>

        <VisualBrush x:Key="Loggedin">
            <VisualBrush.Visual>
                <Image Source="http://icons.iconarchive.com/icons/deleket/sleek-xp-basic/32/Ok-icon.png" Stretch="Uniform" />
            </VisualBrush.Visual>
        </VisualBrush>

        <VisualBrush x:Key="NotLoggedin">
            <VisualBrush.Visual>
                <Image Source="http://icons.iconarchive.com/icons/deleket/sleek-xp-basic/32/Close-2-icon.png" Stretch="Uniform" />
            </VisualBrush.Visual>
        </VisualBrush>

    </Window.Resources>

    <Grid DataContext="{Binding ElementName=UI}">
        <Button Click="btnLogin_Click" Name="btnLogin" HorizontalAlignment="Left" Width="94" Height="40" VerticalAlignment="Top" Margin="63,26,0,0">
            <StackPanel Orientation="Horizontal">
                <Rectangle Width="20" Height="20" Name="recLogin">
                    <Rectangle.Resources>
                        <SolidColorBrush x:Key="BlackBrush" Color="White" />
                    </Rectangle.Resources>
                    <Rectangle.Style>
                        <Style TargetType="{x:Type Rectangle}">
                            <Setter Property="Fill" Value="{StaticResource NotLoggedin}" />
                            <Style.Triggers>
                                <DataTrigger Binding="{Binding IsLoggedIn}" Value="True">
                                    <Setter Property="Fill" Value="{StaticResource Loggedin}" />
                                </DataTrigger>
                            </Style.Triggers>
                        </Style>
                    </Rectangle.Style>
                </Rectangle>
                <TextBlock Text=" login" Name="txbLogin" />
            </StackPanel>
        </Button>
    </Grid>
</Window>

代码：

Code:

public partial class MainWindow : Window, INotifyPropertyChanged
{
    private bool _isLoggedIn;

    public MainWindow()
    {
        InitializeComponent();  
    }

    public bool IsLoggedIn
    {
        get { return _isLoggedIn; }
        set { _isLoggedIn = value; NotifyPropertyChanged("IsLoggedIn"); }
    }

    private void btnLogin_Click(object sender, RoutedEventArgs e)
    {
        IsLoggedIn = !IsLoggedIn;
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged(string property)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
    }
 }

注意：我只是用网上图像，我没有你的ressources，你可以改变，以满足您的需求。

Note: I just used online images as I dont have your ressources, you can change to suit your needs

结果：

IsLoggedIn = FALSE;

IsLoggedIn = TRUE;

IsLoggedIn = false; IsLoggedIn = true;

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