WPF代码注意事项,开发常见问题，知识总结

代码注意事项：

1、代码实现的样式赋值

  XXX.Style = TryFindResource("StyleName") as Style;

2.WPF中FindName方法的使用

　(1)简单的使用　前台代码：

<Button x:Name="btnName" Click="btnName_Click">Test Method FindName</Button>

　　后台代码:

 private void btnName_Click(object sender, RoutedEventArgs e)

{

　　Button b = FindName("btnName") as Button;

　　MessageBox.Show(b.Name);

}

（2）在模板中使用FindName方法

<Grid>

     <Grid x:Name="childGrid">

         <Button x:Name="rootBtn">

             <Button.Template>

                 <ControlTemplate>

                     <Button x:Name="btnName" Click="btnName_Click">Test Method FindName</Button>

                 </ControlTemplate>

             </Button.Template>

         </Button>

       

     </Grid>

 </Grid>

　后台代码：

private void btnName_Click(object sender, RoutedEventArgs e)

    {

        Button b = rootBtn.Template.FindName("btnName",rootBtn) as Button;

        MessageBox.Show(b.Name);

    }

3.使用多个绑定参数

<Button Height="23" Command="{Binding AddCommand}"   Content="计算"

                HorizontalAlignment="Left" Margin="20,0,0,49" Name="button1" VerticalAlignment="Bottom" Width="75">

           <Button.CommandParameter>

               <MultiBinding Converter="{StaticResource ParameterConverter}">

                   <Binding Path="Text" ElementName="textBox1"/>

                   <Binding Path="Text" ElementName="textBox2"/>

               </MultiBinding>

           </Button.CommandParameter>

4、将代码写在XAML中

<Grid>

    <x:Code>  <![CDATA[

    private void button1_Click(object sender, RoutedEventArgs e)

    {

        button1.Background = Brushes.Blue;

        button1.Content = "The code is in XAML";

        MessageBox.Show("hi");

    }

    ]]></x:Code>

    <Button Height="23" Margin="46,56,32,0" Name="button1" VerticalAlignment="Top" Click="button1_Click">Click me!</Button>

</Grid>

5、各属性对应的C#代码

    5.1<Window><Grid><Button ...></Grid></window>

　 等效代码如下：

Grid g = new Grid();

Button b = new Button();

b.Width = 100;

b.Height = 100;

b.Content = "Test Button";

b.Foreground = Brushes.LightBlue;

g.Children.Add(b);

myWindow.AddChild(g);

 6、ItemContainerGenerator.ContainerFromIndex方法的使用

TreeViewItem item = (TreeViewItem)myTreeView.ItemContainerGenerator.ContainerFromIndex(1);

7、WPF获取子控件和父控件方法　

public class Globals

    {

        /// <summary>

        /// 获取父控件方法。该方法将根据当前控件，遍历查找其父控件是否存在。参数1是表示当前子控件名，参数2是要查询父控件名；

        /// </summary>

        public T GetParentObject<T>(DependencyObject obj, string name) where T : FrameworkElement

        {

            DependencyObject parent = VisualTreeHelper.GetParent(obj);

 

            while (parent != null)

            {

                if (parent is T && (((T)parent).Name == name | string.IsNullOrEmpty(name)))

                {

                    return (T)parent;

                }

 

                parent = VisualTreeHelper.GetParent(parent);

            }

 

            return null;

        }

 

        /// <summary>

        /// 该方法将根据当前控件，遍历查找其子控件是否存在。参数1是表示当前父控件名，参数2是要查询子控件名；

        /// </summary>

        public T GetChildObject<T>(DependencyObject obj, string name) where T : FrameworkElement

        {

            DependencyObject child = null;

            T grandChild = null;

 

            for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++)

            {

                child = VisualTreeHelper.GetChild(obj, i);

 

                if (child is T && (((T)child).Name == name | string.IsNullOrEmpty(name)))

                {

                    return (T)child;

                }

                else

                {

                    grandChild = GetChildObject<T>(child, name);

                    if (grandChild != null)

                        return grandChild;

                }

            }

 

            return null;

 

        }

 

        /// <summary>

        /// 该方法将把所有子控件作为List集合返回到客户端。

        /// 其中第一个参数是父控件参数，而第二个参数是特定子控件名称，

        /// 如果需要遍历全部子控件，第二个参数留空即可。

        /// </summary>

        public List<T> GetChildObjects<T>(DependencyObject obj, string name) where T : FrameworkElement

        {

            DependencyObject child = null;

            List<T> childList = new List<T>();

 

            for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++)

            {

                child = VisualTreeHelper.GetChild(obj, i);

 

                if (child is T && (((T)child).Name == name || string.IsNullOrEmpty(name)))

                {

                    childList.Add((T)child);

                }

 

                childList.AddRange(GetChildObjects<T>(child, ""));

            }

 

            return childList;

 

        }

    }

　　

XAML：

Globals VTHelper = new Globals();

StackPanel sp = VTHelper.GetChildObject<StackPanel>(this.LayoutRoot, "spDemoPanel");

Grid layoutGrid = VTHelper.GetParentObject<Grid>(this.spDemoPanel, "LayoutRoot");

List<TextBlock> textblock = VTHelper.GetChildObjects<TextBlock>(this.LayoutRoot, "");

　　

8.GridSplitter控件的使用：

<Grid>

    <Grid.ColumnDefinitions>

        <ColumnDefinition Width="90*" />

        <ColumnDefinition Width="Auto" />

        <ColumnDefinition Width="180*" />

    </Grid.ColumnDefinitions>

    <Grid.RowDefinitions>

        <RowDefinition Height="190*" />

        <RowDefinition Height="Auto" />

        <RowDefinition Height="70*" />

    </Grid.RowDefinitions>

    <Button Content="ButtonA" Margin="3" Grid.Row="0" Grid.Column="0" Grid.RowSpan="3" />

    <Button Content="ButtonB" Margin="3" Grid.Row="0" Grid.Column="2" />

    <Button Content="ButtonC" Margin="3" Grid.Row="2" Grid.Column="2" />

    <GridSplitter Width="3" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"   Grid.Row="0" Grid.Column="1" Grid.RowSpan="3"></GridSplitter>

    <GridSplitter Height="3" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"  Grid.Row="1" Grid.Column="2"></GridSplitter>

</Grid>

效果图:

9.UniformGrid控件中每行没列都相等

<UniformGrid>

    <Button Content="ButtonA" />

    <Button Content="ButtonB" />

    <Button Content="ButtonC" />

    <Button Content="ButtonD" />

    <Button Content="ButtonE" />

    <Button Content="ButtonF" />

    <Button Content="ButtonG" />

    <Button Content="ButtonH" />

</UniformGrid>

如图：

 http://www.cnblogs.com/linlf03/archive/2011/09/07/2159169.html