WPF学习旅程(三)——在XAML中为对象的属性赋值

在XAML中为对象的属性赋值有三种方法：

1、attribute=“value”的形式：

1.1简单属性赋值

<Window x:Class="MultyProcess.Window1"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="Window1" Height="300" Width="300">

<Grid>

<Label Height="28" Margin="48,77,110,0" Name="lblHello" VerticalAlignment="Top">Label</Label>

<Button Margin="48,127,0,112" Name="button1" HorizontalAlignment="Left" Width="75" Click="button1_Click">Button</Button>

</Grid>

</Window>

1.2使用对象属性怎么赋值

前面是一些简单属性的赋值，我们除了简单属性，还有复杂的属性，如对象，下面就是如何给对象赋值

xmal代码：

<Window x:Class="MultyProcess.Window2"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:local="clr-namespace:MultyProcess"

Title="Window2" Height="300" Width="300">

<Window.Resources>

<local:Human x:Key="human" Name="吕伟"></local:Human>

</Window.Resources>

<Grid>

<Button Height="23" HorizontalAlignment="Left" Margin="51,89,0,0" Click="button1_Click" Name="button1" VerticalAlignment="Top" Width="75">Button</Button>

</Grid>

</Window>

。cs代码

/// <summary>

/// Window2.xaml 的交互逻辑

/// </summary>

public partial class Window2 : Window

{

public Window2()

{

InitializeComponent();

}

private void button1_Click(object sender, RoutedEventArgs e)

{

Human human = this.FindResource("human") as Human;

MessageBox.Show(human.Name);

}

}

public class Human

{

public string Name { get; set; }

public Human child { get; set; }

}

1.3怎么给对象赋值对象属性

在前一个示例中human类中的属性child没有被赋值，如果赋值为字符串会编译出错，那么只有通过实现typeConverter来进行扩展示例如下

[TypeConverter(typeof(StringToHumanConvertor))]

public class Human

{

public string Name { get; set; }

public Human child { get; set; }

}

public class StringToHumanConvertor : TypeConverter

{

public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)

{

string name = value.ToString();

Human child = new Human();

child.Name = name;

return child;

}

}

2、属性标签的方式给属性赋值

<Window x:Class="MultyProcess.AttributeValue2"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="AttributeValue2" Height="300" Width="300">

<Grid>

<Button Height="30" Margin="46,0,132,94" VerticalAlignment="Bottom">

<Button.Content>

<Rectangle Width="20" Height="20" Fill="Green" Stroke="Black"></Rectangle>

</Button.Content>

</Button>

<Rectangle Height="100" Stroke="Blue" Margin="28,21,50,0" VerticalAlignment="Top">

<Rectangle.Fill>

<LinearGradientBrush>

<LinearGradientBrush.StartPoint>

<Point X="0" Y="0"></Point>

</LinearGradientBrush.StartPoint>

<LinearGradientBrush.EndPoint>

<Point X="1" Y="1"></Point>

</LinearGradientBrush.EndPoint>

<LinearGradientBrush.GradientStops>

<GradientStopCollection>

<GradientStop Offset="0.2" Color="LightBlue"></GradientStop>

<GradientStop Offset="0.7" Color="DarkBlue"></GradientStop>

<GradientStop Offset="1.0" Color="Blue"></GradientStop>

</GradientStopCollection>

</LinearGradientBrush.GradientStops>

</LinearGradientBrush>

</Rectangle.Fill>

</Rectangle>

</Grid>

</Window>

3、标签扩展

标签扩展有staticresource，binding等五种，示例如下：

<Window x:Class="WPFXAMLCode.Window1"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:ExternalDll="clr-namespace:ExternalDll;assembly=ExternalDll"

xmlns:local="clr-namespace:WPFXAMLCode;assembly="

xmlns:collections="clr-namespace:System.Collections;assembly=mscorlib"

xmlns:sys="clr-namespace:System;assembly=mscorlib"

Title="Window1" Height="300" Width="600"

WindowStartupLocation="CenterScreen">

<Window.Resources>

<SolidColorBrush x:Key="windowLevelResourceBlueBrush" Color="Blue"/>

</Window.Resources>

<StackPanel x:Name="sp1" Orientation="Vertical">

<StackPanel.Resources>

<local:LocalClass x:Key="localClass1" AnIntProp="5"/>

<collections:Hashtable x:Key="ht1">

<sys:Int32 x:Key="key1">1</sys:Int32>

<sys:Int32 x:Key="key2">2</sys:Int32>

</collections:Hashtable>

<SolidColorBrush x:Key="parentLevelResourceOrangeBrush" Color="Orange"/>

</StackPanel.Resources>

<local:LocalControl/>

<ExternalDll:ExternalDllControl/>

<Rectangle Fill="{x:Null}" Stroke="Black" StrokeThickness="2" Height="20"/>

<Button Width="auto" Content="引用window级别资源" Background="{StaticResource windowLevelResourceBlueBrush}"/>

<Button Width="auto" Content="引用window级别资源" Background="{StaticResource windowLevelResourceBlueBrush}"/>

<Button Width="auto" Content="引用Application资源" Background="{StaticResource appLevelResourceGreenBrush}"/>

<Button Width="auto" Content="引用StackPanel级别资源" Background="{StaticResource parentLevelResourceOrangeBrush}"/>

<Button Width="auto" Content="引用LocalResourceDictionary.xaml的资源">

<Button.Resources>

<ResourceDictionary>

<ResourceDictionary.MergedDictionaries>

<ResourceDictionary Source="LocalResourceDictionary.xaml"/>

</ResourceDictionary.MergedDictionaries>

</ResourceDictionary>

</Button.Resources>

<Button.Background>

<StaticResourceExtension ResourceKey="seperateResourceFilePinkBrush"/>

</Button.Background>

</Button>

</StackPanel>

</Window>