• WPF中ListBox的创建和多种绑定用法


    本篇博文为翻译(http://www.c-sharpcorner.com/uploadfile/mahesh/listbox-in-wpf/),本篇博文主要介绍ListBox控件的创建和用法。<ListBox></ListBox>
    先从最容易的开始演示ListBox控件的创建。

    Adding ListBox Items
    下面的代码是向ListBox控件中添加多项ListBoxItem集合。XAML代码如下:

    <ListBox Margin="10,10,0,13" Name="listBox1" HorizontalAlignment="Left"
             VerticalAlignment="Top" Width="194" Height="200">
        <ListBoxItem Content="Coffie"></ListBoxItem>
        <ListBoxItem Content="Tea"></ListBoxItem>
        <ListBoxItem Content="Orange Juice"></ListBoxItem>
        <ListBoxItem Content="Milk"></ListBoxItem>
        <ListBoxItem Content="Iced Tea"></ListBoxItem>
        <ListBoxItem Content="Mango Shake"></ListBoxItem>
    </ListBox>
    

      


    运行后的界面如图 Figure 1:

                    Figure 1

    Adding ListBox Items Dynamically
    动态添加ListBox集合项。用一个文本框,一个按钮。当点击添加按钮向ListBox控件中添加用法输入文本框的值。XAML代码如下:

    <TextBox Height="23" HorizontalAlignment="Left" Margin="8,14,0,0"
                     Name="textBox1" VerticalAlignment="Top" Width="127" />
    <Button Height="23" Margin="140,14,0,0" Name="button1" VerticalAlignment="Top"
                    HorizontalAlignment="Left" Width="76" Click="button1_Click">
                Add Item
    </Button>
    

      


    运行后的界面如图Figure 2:

              Figure 2


    Button按钮的后台事件代码如下:

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        listBox1.Items.Add(textBox1.Text);
    }
    

      


    当点击添加按钮,用户输入文本框的值,就会显示到ListBox中。界面如图Figure 3:

                    Figure 3

    Deleting ListBox Items
    我们可以用ListBox.Items.Remove 或者 ListBox.Items.RemoveAt方法移除ListBox集合中的一项。RemoveAt 方法是用集合中的下标。
    在XAML 代码中添加一个移除的按钮,代码如下:
    <Button Height="23" Margin="226,14,124,0" Name="DeleteButton" VerticalAlignment="Top" Click="DeleteButton_Click">
        Delete Item</Button>
    按钮事件中写移除的逻辑。

    private void DeleteButton_Click(object sender, RoutedEventArgs e)
    {
       listBox1.Items.RemoveAt
           (listBox1.Items.IndexOf(listBox1.SelectedItem));                 
    }
    

      

    Formatting and Styling
    Formatting ListBox Items
    格式ListBox项,设置ListBoxItem项的前景色和背景色。XAML中的代码如下:
    <ListBoxItem Background="LightCoral" Foreground="Red" Content="Coffie"></ListBoxItem>
    我们也可以设置ListBoxItem的字体样式。
    <ListBoxItem Background="LightCoral" Foreground="Red" Content="Coffie" FontFamily="Verdana" FontSize="12"

    FontWeight="Bold"></ListBoxItem>
    现在来统一设置一下ListBoxItems的属性:

    <ListBoxItem Background="LightCoral" Foreground="Red" Content="Coffie" FontFamily="Verdana" FontSize="12"
    
    FontWeight="Bold"></ListBoxItem>
                <ListBoxItem Background="LightGray" Foreground="Black" Content="Tea" FontFamily="Georgia" FontSize="14"
    
    FontWeight="Bold"></ListBoxItem>
                <ListBoxItem Background="LightBlue" Foreground="Purple" Content="Orange Juice"
                             FontFamily="Verdana" FontSize="12" FontWeight="Bold"></ListBoxItem>
                <ListBoxItem Background="LightGreen" Foreground="Green" Content="Milk" FontFamily="Georgia" FontSize="14"
    
    FontWeight="Bold"></ListBoxItem>
                <ListBoxItem Background="LightBlue" Foreground="Blue" Content="IcedTea"
                             FontFamily="Verdana" FontSize="12" FontWeight="Bold"></ListBoxItem>
                <ListBoxItem Background="LightSlateGray" Foreground="Orange" Content="Mango Shake"
                             FontFamily="Georgia" FontSize="14" FontWeight="Bold"></ListBoxItem>

    运行后的界面如图Figure 4:

                    Figure 4

    Displaying Images in a ListBox
    在ListBoxItem 中放置图片和文本,让图片和文本在一条线上。因为ListBoxItem中只能添加一个文本,为了添加多个文本,

    需要借助容器StackPanel 控件。下面的代码段,ListBoxItem中增加了一个图片和文字。

    <ListBoxItem Background="LightCoral" Foreground="Red"
                 FontFamily="Verdana" FontSize="12" FontWeight="Bold">
        <StackPanel Orientation="Horizontal">
            <Image Source="coffie.jpg" Height="30"></Image>
            <TextBlock Text="Coffie"></TextBlock>
        </StackPanel>
    </ListBoxItem>


    运行后的效果如图Figure 5:

                    Figure 5

    ListBox with CheckBoxes
    在ListBoxItem中添加复选框。复选框中添加图片和文本。XAML代码如下:

    <ListBoxItem Background="LightCoral" Foreground="Red"
                 FontFamily="Verdana" FontSize="12" FontWeight="Bold">               
            <CheckBox Name="CoffieCheckBox">
                <StackPanel Orientation="Horizontal">
                <Image Source="coffie.jpg" Height="30"></Image>
                <TextBlock Text="Coffie"></TextBlock>
            </StackPanel>
        </CheckBox>
    </ListBoxItem>

    我改变ListBoxItems 中的代码向ListBoxItems 中添加CheckBox控件。设置CheckBox的Name属性,当点击图片或者

    文本时都可以选中CheckBox控件。

    <ListBoxItem Background="LightCoral" Foreground="Red"
                 FontFamily="Verdana" FontSize="12" FontWeight="Bold">               
            <CheckBox Name="CoffieCheckBox">
                <StackPanel Orientation="Horizontal">
                <Image Source="coffie.jpg" Height="30"></Image>
                <TextBlock Text="Coffie"></TextBlock>
            </StackPanel>
        </CheckBox>
    </ListBoxItem>
    <ListBoxItem Background="LightGray" Foreground="Black"
                 FontFamily="Georgia" FontSize="14" FontWeight="Bold">
        <CheckBox Name="TeaCheckBox">
            <StackPanel Orientation="Horizontal">
                <Image Source="tea.jpg" Height="30"></Image>
                <TextBlock Text="Tea"></TextBlock>
            </StackPanel>
        </CheckBox>
    </ListBoxItem>
    <ListBoxItem Background="LightBlue" Foreground="Purple"
                 FontFamily="Verdana" FontSize="12" FontWeight="Bold">
        <CheckBox Name="OrangeJuiceCheckBox">
            <StackPanel Orientation="Horizontal">
                <Image Source="OrangeJuice.jpg" Height="40"></Image>
                <TextBlock Text="OrangeJuice"></TextBlock>
            </StackPanel>
        </CheckBox>
    </ListBoxItem>
    <ListBoxItem Background="LightGreen" Foreground="Green"
                 FontFamily="Georgia" FontSize="14" FontWeight="Bold">
        <CheckBox Name="MilkCheckBox">
            <StackPanel Orientation="Horizontal">
                <Image Source="Milk.jpg" Height="30"></Image>
                <TextBlock Text="Milk"></TextBlock>
            </StackPanel>
        </CheckBox>
    </ListBoxItem>
    <ListBoxItem Background="LightBlue" Foreground="Blue"
                 FontFamily="Verdana" FontSize="12" FontWeight="Bold">
        <CheckBox Name="IcedTeaCheckBox">
            <StackPanel Orientation="Horizontal">
                <Image Source="IcedTea.jpg" Height="30"></Image>
                <TextBlock Text="Iced Tea"></TextBlock>
            </StackPanel>
        </CheckBox>
    </ListBoxItem>
    <ListBoxItem Background="LightSlateGray" Foreground="Orange"
                 FontFamily="Georgia" FontSize="14" FontWeight="Bold">
        <CheckBox Name="MangoShakeCheckBox">
            <StackPanel Orientation="Horizontal">
                <Image Source="MangoShake.jpg" Height="30"></Image>
                <TextBlock Text="Mango Shake"></TextBlock>
            </StackPanel>
        </CheckBox>
    </ListBoxItem>


    运行后的结果如图Figure 6:

                  Figure 6
    Data Binding
    下面介绍ListBox跟对象,数据库,XML文件以及其他控件的绑定。
    Data Binding with Objects
    ListBox 中的ItemsSource属性绑定到ArrayList集合上。

    // Bind ArrayList with the ListBox
    LeftListBox.ItemsSource = LoadListBoxData();           
     
    
    private ArrayList LoadListBoxData()
    {
        ArrayList itemsList = new ArrayList();
        itemsList.Add("Coffie");
        itemsList.Add("Tea");
        itemsList.Add("Orange Juice");
        itemsList.Add("Milk");
        itemsList.Add("Mango Shake");
        itemsList.Add("Iced Tea");
        itemsList.Add("Soda");
        itemsList.Add("Water");
        return itemsList;
    }

    例子:从一个列表框的数据传输到另一个列表框中。点击“Add按钮”让左边的ListBox中的选中的数据添加到右边ListBox中。

    点击“Remove按钮”让右边选中的数据添加到左边的ListBox中。运行后的界面如图Figure 7:

                         Figure 7


    XAML 代码如下:

    <ListBox Margin="11,13,355,11" Name="LeftListBox" />
    <ListBox Margin="0,13,21,11" Name="RightListBox" HorizontalAlignment="Right"
    
    Width="216" />
    <Button Name="AddButton" Height="23" Margin="248,78,261,0" VerticalAlignment="Top"
    
     Click="AddButton_Click">Add &gt;&gt;</Button>
    <Button Name="RemoveButton" Margin="248,121,261,117"Click="RemoveButton_Click">&lt;&lt; Remove</Button>

    窗体加载事件中的代码:

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        // Get data from somewhere and fill in my local ArrayList
        myDataList = LoadListBoxData();
        // Bind ArrayList with the ListBox
        LeftListBox.ItemsSource = myDataList;           
    }
     
    /// <summary>
    /// Generate data. This method can bring data from a database or XML file
    /// or from a Web service or generate data dynamically
    /// </summary>
    /// <returns></returns>
    private ArrayList LoadListBoxData()
    {
        ArrayList itemsList = new ArrayList();
        itemsList.Add("Coffie");
        itemsList.Add("Tea");
        itemsList.Add("Orange Juice");
        itemsList.Add("Milk");
        itemsList.Add("Mango Shake");
        itemsList.Add("Iced Tea");
        itemsList.Add("Soda");
        itemsList.Add("Water");
        return itemsList;
    }

    Add按钮事件中的代码如下:

    private void AddButton_Click(object sender, RoutedEventArgs e)
    {
        // Find the right item and it's value and index
        currentItemText = LeftListBox.SelectedValue.ToString();
        currentItemIndex = LeftListBox.SelectedIndex;
       
        RightListBox.Items.Add(currentItemText);
        if (myDataList != null)
        {
            myDataList.RemoveAt(currentItemIndex);
        }
     
        // Refresh data binding
        ApplyDataBinding();
    }
     
    /// <summary>
    /// Refreshes data binding
    /// </summary>
    private void ApplyDataBinding()
    {
        LeftListBox.ItemsSource = null;
        // Bind ArrayList with the ListBox
        LeftListBox.ItemsSource = myDataList;
    }

    Remove按钮事件中的代码如下:

    private void RemoveButton_Click(object sender, RoutedEventArgs e)
    {
        // Find the right item and it's value and index
        currentItemText = RightListBox.SelectedValue.ToString();
        currentItemIndex = RightListBox.SelectedIndex;
        // Add RightListBox item to the ArrayList
        myDataList.Add(currentItemText);
     
      RightListBox.Items.RemoveAt(RightListBox.Items.IndexOf
    
    (RightListBox.SelectedItem));
     
        // Refresh data binding
        ApplyDataBinding();
    }

    Data Binding with a Database
    ListBox跟SQL Server数据库中数据的绑定。先看SQL Server数据库中的表。如图Figure 9:

              Figure 9


    在WPF中我们将读取数据库中的ContactName, Address, City, and Country字段。最终的ListBox显示如图Figure 10:

                    Figure 10

    现在来看XAML文件,这个例子我们要用到资源,在其中创建DataTemplate 模板叫做listBoxTemplate。模板里面有两个DockPanel控件。

    第一个中绑定的是名称字段,第二个中绑定的是地址字段。资源中的代码如下:

    <Window.Resources>
        <DataTemplate x:Key="listBoxTemplate">
            <StackPanel Margin="3">
                <DockPanel >
                    <TextBlock FontWeight="Bold" Text="Name:"
                      DockPanel.Dock="Left"
                      Margin="5,0,10,0"/>
                    <TextBlock Text="  " />
                    <TextBlock Text="{Binding ContactName}" Foreground="Green"FontWeight="Bold" />
                </DockPanel>
                <DockPanel >
                    <TextBlock FontWeight="Bold" Text="Address:" Foreground="DarkOrange"
                      DockPanel.Dock="Left"
                      Margin="5,0,5,0"/>
                    <TextBlock Text="{Binding Address}" />
                     <TextBlock Text=", " />
                    <TextBlock Text="{Binding City}" />
                     <TextBlock Text=", " />
                    <TextBlock Text="{Binding Country}" />
                </DockPanel>
            </StackPanel>
        </DataTemplate>
    </Window.Resources>

    现在让我们添加ListBox 控件并设置它的绑定源和绑定模板。
    <ListBox Margin="17,8,15,26" Name="listBox1"  ItemsSource="{Binding Tables[0]}"
                     ItemTemplate="{StaticResource listBoxTemplate}" />
    再就是连接数据库,获得数据,已经绑定ListBox控件的后台代码。

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        BindData();          
    }
     
    private void BindData()
    {
        DataSet dtSet = new DataSet();
        using (connection = new SqlConnection(connectionString))
        {
            command = new SqlCommand(sql, connection);              
            SqlDataAdapter adapter = new SqlDataAdapter();          
            connection.Open();
            adapter.SelectCommand = command;
            adapter.Fill(dtSet, "Customers");
            listBox1.DataContext = dtSet;
        }
    }

    Data Binding with XML
    现在让我们来看看怎么绑定XML文件中的数据集到ListBox控件上。XML文件中的代码如下:

    <XmlDataProvider x:Key="BooksData" XPath="Inventory/Books">
        <x:XData>
            <Inventory xmlns="">
                <Books>
                    <Book Category="Programming" >
                        <Title>A Programmer's Guide to ADO.NET</Title>
                        <Summary>Learn how to write database applications usingADO.NET and C#.
                        </Summary>
                        <Author>Mahesh Chand</Author>
                        <Publisher>APress</Publisher>
                    </Book>
                    <Book Category="Programming" >
                        <Title>Graphics Programming with GDI+</Title>
                        <Summary>Learn how to write graphics applications using GDI+and C#.
                        </Summary>
                        <Author>Mahesh Chand</Author>
                        <Publisher>Addison Wesley</Publisher>
                    </Book>
                    <Book Category="Programming" >
                        <Title>Visual C#</Title>
                        <Summary>Learn how to write C# applications.
                        </Summary>
                        <Author>Mike Gold</Author>
                        <Publisher>APress</Publisher>
                    </Book>
                    <Book Category="Programming" >
                        <Title>Introducing Microsoft .NET</Title>
                        <Summary>Programming .NET
                        </Summary>
                        <Author>Mathew Cochran</Author>
                        <Publisher>APress</Publisher>
                    </Book>
                    <Book Category="Database" >
                        <Title>DBA Express</Title>
                        <Summary>DBA's Handbook
                        </Summary>
                        <Author>Mahesh Chand</Author>
                        <Publisher>Microsoft</Publisher>
                    </Book>
                </Books>
    
            </Inventory>
        </x:XData>
    </XmlDataProvider>

    接下来就是绑定XmlDataProvider。我们设置ItemsSource绑定到XmlDataProvider的x:Key值上。用XPath绑定XML中的数据。

    模板里面绑定属性。XAML中的代码,我们可以看到非常的简洁。

    <ListBox Width="400" Height="300" Background="LightGray">
        <ListBox.ItemsSource>
            <Binding Source="{StaticResource BooksData}"
           XPath="*[@Category='Programming'] "/>
        </ListBox.ItemsSource>
     
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="Title: " FontWeight="Bold"/>
                    <TextBlock Foreground="Green"  >
                        <TextBlock.Text>
                            <Binding XPath="Title"/>
                        </TextBlock.Text>                     
                    </TextBlock>                    
               </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

    运行后的界面如图Figure 11:

                   Figure 11


    Data Binding with Controls
    最后一个例子看看ListBox怎么样和别的控件绑定。我们先来看看运行后的界面Figure 12:

                Figure 12


    选择ListBox中的一个颜色,把选中的值赋给文本框,并且赋给Canvas控件,让它改变颜色。以下就是XAML中的代码:

    <StackPanel Orientation="Vertical">
        <TextBlock Margin="10,10,10,10" FontWeight="Bold">
            Pick a color from below list
        </TextBlock>
        <ListBox Name="mcListBox" Height="100" Width="100"Margin="10,10,0,0" HorizontalAlignment="Left" >
            <ListBoxItem>Orange</ListBoxItem>
            <ListBoxItem>Green</ListBoxItem>
            <ListBoxItem>Blue</ListBoxItem>
            <ListBoxItem>Gray</ListBoxItem>
            <ListBoxItem>LightGray</ListBoxItem>
            <ListBoxItem>Red</ListBoxItem>
        </ListBox>
       <TextBox Height="23" Name="textBox1" Width="120" Margin="10,10,0,0"
    
    HorizontalAlignment="Left"  >
            <TextBox.Text>
                <Binding ElementName="mcListBox" Path="SelectedItem.Content"/>
            </TextBox.Text>
        </TextBox>
        <Canvas Margin="10,10,0,0" Height="200" Width="200" HorizontalAlignment="Left">
            <Canvas.Background>
                <Binding ElementName="mcListBox" Path="SelectedItem.Content"/>
            </Canvas.Background>
        </Canvas>
    </StackPanel>

    作者:荒野的呼唤
    出处:http://www.cnblogs.com/Health/
    关于作者:如有问题或建议,请多多赐教!
    本文版权归作者和博客园共有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接
    如有问题,可以通过  HiKangZhang@gmail.com  联系我,非常感谢。

  • 相关阅读:
    Python 十七天 成员
    python学习17——字典。
    python学习16——列表。
    python学习15——Random。
    python学习14——分支和函数。
    python学习13——while循环。
    python学习12——循环和列表
    python学习8——整理第一部分。
    Flask HTTP请求与响应
    Falsk 路由简析
  • 原文地址:https://www.cnblogs.com/Health/p/2355924.html
Copyright © 2020-2023  润新知