Question

WPF中用xaml怎么给Gird或canvas插入背景图片？

Answer 1

下面我就大概说下过程，首页建立一个工程为WpfLoginView,并在Expression Blend 下设置一个如下图的界面

xaml代码如下：

<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"
    x:Class="WpfLoginView.LoginView"
    x:Name="Window"
    Title="LoginView" mc:Ignorable="d" KeyDown="Window_KeyDown" WindowStartupLocation="CenterScreen" SizeToContent="WidthAndHeight" AllowsTransparency="True" WindowStyle="None" Foreground="#FF9DC2EF">

    <Grid x:Name="LayoutRoot" Loaded="LayoutRoot_Loaded">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="120.012"/>
            <ColumnDefinition Width="209.988"/>
            <ColumnDefinition Width="81"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="72.899"/>
            <RowDefinition Height="30.101"/>
            <RowDefinition Height="43"/>
            <RowDefinition Height="43"/>
            <RowDefinition Height="80"/>
        </Grid.RowDefinitions>
        <Label HorizontalAlignment="Left" Content="用户名" Margin="0,8" Grid.Column="1" Grid.Row="2" Width="60" FontSize="16" Foreground="#FFE2E4EB"/>
        <Label HorizontalAlignment="Left" Margin="0,4,0,12" Content="密  码" Grid.Column="1" Grid.Row="3" FontSize="16" Width="64" Foreground="#FFEEF0F5"/>
        <TextBox x:Name="txtusername" TextWrapping="Wrap" Margin="0,8,8,10" Grid.Column="1" Grid.Row="2" BorderThickness="2" HorizontalAlignment="Right" Width="137.988" d:LayoutOverrides="GridBox">
            <TextBox.BorderBrush>
                <LinearGradientBrush EndPoint="0,20" StartPoint="0,0" MappingMode="Absolute">
                    <GradientStop Color="#FFABADB3" Offset="0.05"/>
                    <GradientStop Color="#FFE2E3EA" Offset="0.07"/>
                    <GradientStop Color="#FFBCDBF9" Offset="1"/>
                </LinearGradientBrush>
            </TextBox.BorderBrush>
        </TextBox>
        <PasswordBox x:Name="txtpassword" Margin="0,6,8,11" Grid.Column="1" Grid.Row="3" BorderThickness="2" HorizontalAlignment="Right" Width="137.988" d:LayoutOverrides="GridBox">
            <PasswordBox.BorderBrush>
                <LinearGradientBrush EndPoint="0,20" StartPoint="0,0" MappingMode="Absolute">
                    <GradientStop Color="#FFABADB3" Offset="0.05"/>
                    <GradientStop Color="#FFE2E3EA" Offset="0.07"/>
                    <GradientStop Color="#FFC1DBF5" Offset="1"/>
                </LinearGradientBrush>
            </PasswordBox.BorderBrush>
        </PasswordBox>
        <Button x:Name="LoginConfirmButton" Content="登  陆" Grid.Column="1" Grid.Row="4" Click="LoginConfirmButton_Click" FontSize="16" VerticalAlignment="Top" Height="24.687" Margin="64,8,91.988,0" Style="{DynamicResource ConfirmCancelButtonStyle}" />
        <Button x:Name="LoginCancelButton" Margin="144.988,8,0,0" Content="取  消" HorizontalAlignment="Left" Width="57" Grid.Column="1" Grid.Row="4" Click="LoginCancelButton_Click" FontSize="16" VerticalAlignment="Top" Height="24.687" Style="{DynamicResource ConfirmCancelButtonStyle}"/>
    </Grid>
</Window>

注意一下这几个属性的设置：WindowStartupLocation="CenterScreen"  AllowsTransparency="True" WindowStyle="None"。两个Button的样式代码我就不贴了，下面我们假如有下面这么一张图片(Login.png)，如何成为背景呢？

 

首先把这张图放在工程中

public LoginView()
{
    this.InitializeComponent();
     txtusername.Focus();//聚焦在用户名输入框中
    // 在此点之下插入创建对象所需的代码。
    ImageBrush b = new ImageBrush();
     b.ImageSource = new BitmapImage(new Uri("pack://application:,,,/Login.png"));
      b.Stretch = Stretch.Fill;
      this.Background = b;
   }

直接在构造函数中输入以上代码就Ok了。