WPF怎么实现数据和控件的绑定

公西雒 2013-08-13 02:26:37

例如textbox，怎么让他随着我定义的string型变量的改变而显示不同的字符？

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公西雒 2013-08-14

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引用 7 楼 KumaPower 的回复:

[quote=引用 6 楼 danding_ge 的回复:] 用Image。。。。

一样的啊。假设项目文件结构如下：

<Window x:Class="WpfTest.Window2"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Window2" Height="300" Width="300">
    <Grid>
        <Image Height="150" HorizontalAlignment="Left" Margin="12,12,0,0" Name="image1" Stretch="Fill" VerticalAlignment="Top" Width="200" Source="{Binding Path=MyString}" />
        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="40,176,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
    </Grid>
</Window>

using System;
using System.ComponentModel;
using System.Windows;

namespace WpfTest
{
    /// <summary>
    /// Window2.xaml 的交互逻辑
    /// </summary>
    public partial class Window2 : Window, INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        private void NotifyPropertyChanged(String propertyName)
        {
            if (PropertyChanged != null) {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        private String m_mystring = "/Images/Bluehills.jpg";
        public String MyString
        {
            get { return m_mystring; }
            set { 
                m_mystring = value; 
                NotifyPropertyChanged("MyString");
            }
        }

        public Window2()
        {
            InitializeComponent();

            this.DataContext = this;
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            MyString = "/Images/Sunset.jpg";
        }
    }
}

[/quote] 哦哦谢谢谢谢！有空再帮我看看这个吧http://bbs.csdn.net/topics/390547382

Bonjour-你好 2013-08-14

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引用 6 楼 danding_ge 的回复:

用Image。。。。

一样的啊。假设项目文件结构如下：

<Window x:Class="WpfTest.Window2"

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

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

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

    <Grid>

        <Image Height="150" HorizontalAlignment="Left" Margin="12,12,0,0" Name="image1" Stretch="Fill" VerticalAlignment="Top" Width="200" Source="{Binding Path=MyString}" />

        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="40,176,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />

    </Grid>

</Window>

using System;

using System.ComponentModel;

using System.Windows;



namespace WpfTest

{

    /// <summary>

    /// Window2.xaml 的交互逻辑

    /// </summary>

    public partial class Window2 : Window, INotifyPropertyChanged

    {

        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(String propertyName)

        {

            if (PropertyChanged != null) {

                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));

            }

        }



        private String m_mystring = "/Images/Bluehills.jpg";

        public String MyString

        {

            get { return m_mystring; }

            set { 

                m_mystring = value; 

                NotifyPropertyChanged("MyString");

            }

        }



        public Window2()

        {

            InitializeComponent();



            this.DataContext = this;

        }



        private void button1_Click(object sender, RoutedEventArgs e)

        {

            MyString = "/Images/Sunset.jpg";

        }

    }

}

公西雒 2013-08-14

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引用 5 楼 KumaPower 的回复:

[quote=引用 4 楼 danding_ge 的回复:] 如果换成图片，Text="{Binding Path=MyString}"怎么改呢？

TextBox要绑定图片、要显示图片？！[/quote] 用Image。。。。

Bonjour-你好 2013-08-14

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引用 4 楼 danding_ge 的回复:

如果换成图片，Text="{Binding Path=MyString}"怎么改呢？

TextBox要绑定图片、要显示图片？！

公西雒 2013-08-14

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引用 3 楼 KumaPower 的回复:

[quote=引用 2 楼 danding_ge 的回复:] 你还是回答了吧。。。。我很急！

<Window x:Class="WpfTest.Window2"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Window2" Height="300" Width="300">
    <Grid>
        <TextBox Width="100" VerticalAlignment="Center" Text="{Binding Path=MyString}"/>
    </Grid>
</Window>

using System;
using System.ComponentModel;
using System.Windows;

namespace WpfTest
{
    /// <summary>
    /// Window2.xaml 的交互逻辑
    /// </summary>
    public partial class Window2 : Window, INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        private void NotifyPropertyChanged(String propertyName)
        {
            if (PropertyChanged != null) {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        private String m_mystring = "0";
        public String MyString
        {
            get { return m_mystring; }
            set { 
                m_mystring = value; 
                NotifyPropertyChanged("MyString");
            }
        }

        public Window2()
        {
            InitializeComponent();

            MyString = "1";
            this.DataContext = this;
        }
    }
}

[/quote] 如果换成图片，Text="{Binding Path=MyString}"怎么改呢？

Bonjour-你好 2013-08-13

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引用 2 楼 danding_ge 的回复:

你还是回答了吧。。。。我很急！

<Window x:Class="WpfTest.Window2"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Window2" Height="300" Width="300">
    <Grid>
        <TextBox Width="100" VerticalAlignment="Center" Text="{Binding Path=MyString}"/>
    </Grid>
</Window>

using System;
using System.ComponentModel;
using System.Windows;

namespace WpfTest
{
    /// <summary>
    /// Window2.xaml 的交互逻辑
    /// </summary>
    public partial class Window2 : Window, INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        private void NotifyPropertyChanged(String propertyName)
        {
            if (PropertyChanged != null) {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        private String m_mystring = "0";
        public String MyString
        {
            get { return m_mystring; }
            set { 
                m_mystring = value; 
                NotifyPropertyChanged("MyString");
            }
        }

        public Window2()
        {
            InitializeComponent();

            MyString = "1";
            this.DataContext = this;
        }
    }
}

公西雒 2013-08-13