WPF code considerations, development FAQ, knowledge Summary

Code considerations:

1. Code-implemented style assignment

Xxx. Style = tryfindresource ("stylename") as style;

 

2. Use of the findname method in WPF

(1) Simple foreground code:

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

Background code:

Private void btnname_click (Object sender, routedeventargs E)

{

Button B = findname ("btnname") as button;

MessageBox. Show (B. Name );

}

(2) Use the findname method in the template

   <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>

Background code:

  　　private void btnName_Click(object sender, RoutedEventArgs e)        {            Button b = rootBtn.Template.FindName("btnName",rootBtn) as Button;            MessageBox.Show(b.Name);        }

3. Use multiple binding parameters

<Button Height = "23" command = "{binding addcommand}" content = "computing" horizontalalignment = "Left" margin = "20, 0, 0, 49 "name =" button1 "verticalignment =" bottom "width =" 75 "> <button. commandparameter> <multibinding converter = "{staticresource parameterconverter}"> <binding Path = "text" elementname = "textbox1"/> <binding Path = "text" elementname = "textbox2 "/> </multibinding> </button. commandparameter>

4. Write the code in XAML

    <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. C # code corresponding to each attribute

5.1 <WINDOW> <grid> <button...> </GRID> </WINDOW>

The equivalent code is as follows:

            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. Use the itemcontainergenerator. containerfromindex Method

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

7. How to obtain child and parent controls using WPF

Public class globals {// <summary> // obtain the parent control method. This method traverses the current control to check whether its parent control exists. Parameter 1 indicates the name of the current Child control, and parameter 2 indicates the name of the parent control to be queried; // </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> /// this method traverses the current control to check whether its subcontrol exists. Parameter 1 indicates the name of the current parent control, and parameter 2 indicates the name of the child control to be queried; // </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> // This method returns all child controls to the client as a list set. /// The first parameter is the parent control parameter, and the second parameter is the Special Control name. // If You Need to traverse all child controls, leave the second parameter blank. /// </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. Use of the gridsplitter control:

    <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>

:

9. In the uniformgrid control, no columns in each row are equal.

    <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>