数据绑定

1,绑定到控件：ElementName是数据源名，Path是绑定的内容

<StackPanel>
        <TextBlock Width="248" Height="24" Text="Colors:" 
        TextWrapping="Wrap"/>
        <ListBox x:Name="lbColor" Width="248">
            <ListBoxItem Content="Blue"/>
            <ListBoxItem Content="Green"/>
            <ListBoxItem Content="Yellow"/>
            <ListBoxItem Content="Red"/>
            <ListBoxItem Content="Purple"/>
            <ListBoxItem Content="Orange"/>
        </ListBox>
        <TextBlock Width="248" Height="24" Text="You selected color:" />
        <TextBlock Width="248" Height="24" 
            Text="{Binding ElementName=lbColor, Path=SelectedItem.Content}"
            Background="{Binding ElementName=lbColor,Path=SelectedItem.Content}"/>
        <TextBox Width="248" Height="24" 
        Text="{Binding ElementName=lbColor, Path=SelectedItem.Content, 
        Mode=TwoWay}" x:Name="txtSelectedColor" 
        Background="{Binding ElementName=lbColor, Path=SelectedItem.Content, 
        Mode=OneWay}"/>

    </StackPanel>

 

2.绑定到资源的语法与绑定到控件的语法略有不同。绑定到控件时，可以设置绑定的 ElementName 和 Path 属性。但是绑定到资源时，需要设置 Source 属性，由于我们是绑定到 XmlDataProvider，所以还要设置绑定的 XPath 属性。

<?xml version="1.0" encoding="utf-8" ?>
<colors >
  <color name="red" primary="true"/>
  <color name="orange" primary="false"/>
  <color name="blue" primary="true"/>
  <color name="purple" primary="false"/>
  <color name="yellow" primary="true"/>
  <color name="green" primary="false"/>
</colors>

Path为什么变为SelectedValue，因为ListBox的数据是绑定于{StaticResource Colors}

<StackPanel>
        <StackPanel.Resources>
            <XmlDataProvider x:Key="Colors" Source="color.xml" XPath="/colors"/>
        </StackPanel.Resources>
        
        <TextBlock Width="248" Height="24" Text="Colors:" 
        TextWrapping="Wrap"/>
        <ListBox x:Name="lbColor" Width="248" Height="100" IsSynchronizedWithCurrentItem="True" 
               ItemsSource="{Binding Source={StaticResource Colors}, XPath=color/@name}">
        </ListBox>

        <TextBlock Width="248" Height="24" Text="You selected color:" />
        <TextBlock Width="248" Height="24" 
            Text="{Binding ElementName=lbColor, Path=SelectedValue}"
            Background="{Binding ElementName=lbColor,Path=SelectedValue}"/>
        <TextBox Width="248" Height="24" 
        Text="{Binding ElementName=lbColor, Path=SelectedValue, 
        Mode=TwoWay}" x:Name="txtSelectedColor" 
        Background="{Binding ElementName=lbColor, Path=SelectedValue, 
        Mode=OneWay}"/>
        <Button Content="focus"/>

    </StackPanel>

 

3,DataTemplate

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace BindingTest
{
    public class Person
    {
        private int _id;
        private string _fullName;
        private string _title;
        private string _city;

        public Person(int id, string fullName, string title, string city)
        {
            _id = id;
            _fullName = fullName;
            _title = title;
            _city = city;
        }

        public string City
        {
            get { return _city; }
            set { _city = value; }
        }
        public string Title
        {
            get { return _title; }
            set { _title = value; }
        }

        public string FullName
        {
            get { return _fullName; }
            set { _fullName = value; }
        }
        public int Id
        {
            get { return _id; }
            set { _id = value; }
        }
    }
}

 

 

<Window x:Class="BindingTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525"
        xmlns:svc="clr-namespace:BindingTest"
>

    <StackPanel>
        <StackPanel.Resources>
            <ObjectDataProvider x:Key="persons" 
          ObjectType="{x:Type svc:PersonService}" 
          MethodName="GetPersonList" ></ObjectDataProvider>
            <DataTemplate x:Key="personLayout" DataType="Person">
                <StackPanel Orientation="Vertical">
                    <TextBlock Text="{Binding Path=FullName}" 
                            FontWeight="Bold" Foreground="Blue">
                    </TextBlock>
                    <StackPanel Orientation="Horizontal">
                        <TextBlock Text="{Binding Path=Title}"></TextBlock>
                        <TextBlock Text=", "></TextBlock>
                        <TextBlock Text="{Binding Path=City}"></TextBlock>
                    </StackPanel>
                </StackPanel>
            </DataTemplate>
        </StackPanel.Resources>
        <TextBlock></TextBlock>
        <ListBox x:Name="lbPersons" 
            ItemsSource="{Binding Source={StaticResource persons}}" 
            ItemTemplate="{DynamicResource personLayout}" 
            IsSynchronizedWithCurrentItem="True"/>

    </StackPanel>
</Window>

　　x:key="persons"和{x:Type svc:PersonService}定义名为persons的类PersonService对象

　　MethodName属性调用类PersonService的对象方法GetPersonList

　　listBox的IsSynchronizedWithCurrentItem 属性设置为 true 以确保选定的项始终对应于 ItemCollection 中的 CurrentItem 属性。例如，假定有两个 ListBox 控件，这两个控件的 ItemsSource 属性设置为相同源。对这两个列表框将 IsSynchronizedWithCurrentItem 设置为 true 以确保在每个 ListBox 中的选定项相同。