How to create controls from code in a custom control?

2023-01-21 03:56 问答作者：

In MainPage.xaml.cs (Silverlight Application) I can do something like this:

StackPanel myStackPanel = new StackPanel();

Button myButton = new Button();
myButton.Content = "Button";
myButton.Width = 200;
myButton.Height = 30;

Button myButton1 = new Button();
myButton1.Content = "Button 1";
myButton1.Width = 200;
myButton1.Height = 30;

myStackPanel.Children.Add(myButton);
myStackPanel.Children.Add(myButton1);

this.LayoutRoot.Children.Add(myStackPanel);

What is the equivalent of this code in a custom control when I'm trying to create these controls from the code?

Update:

My question is probably too confusing. I'l try better formulation. So, I have

Generic.xaml

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:DemoAddControlLib">

    <Style TargetType="local:DemoControlShowtime">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="local:DemoControlShowtime">
                    <Grid x:Name="LayoutRootControl">
                        <Button x:Name="Button1" Content="Hi" Width="150" Height="30"></Button>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

And code:

DemoControlShowtime.cs

[TemplatePart(Name = "Button1", Type=typeof(Button))]
public class DemoControlShowtime : Control
{
    public DemoControlShowtime()
    {
        this.DefaultStyleKey = typeof(DemoControlShowtime);
    }

    // Events
    public override void OnApplyTemplate()
    {
        Button1 = (Button)GetTemplateChild("Button1");
    }

    private Button button1;

    private Button Button1
    {
        get { return button1; }
        set
        {
            if (button1 != null)
            {
                Button1.Click开发者_C百科 -= new RoutedEventHandler(myButton_Click);
            }

            button1 = value;

            button1.Click += new RoutedEventHandler(myButton_Click);
        }
    }

    void myButton_Click(object sender, RoutedEventArgs e)
    {
        Button1.Content = "Hello Button";


    }
}

If I click on Button1 the Content changes from "Hi" to "Hello Button". I want, when Button1 is clicked, to add StackPanel with two buttons as its Children into the Grid LayoutRootControl. I know there is Visibility property and put it into the xaml would be easier but I'm curious how to do it from the code.

I hope this is much clearer than the question was before.

The code isn't really any different to what you have. The only variation is that the field LayoutRoot is not created for you.

However with this line of code:-

 Grid LayoutRoot = GetTemplateChild("LayoutRootControl") as Grid;

The rest of your code would be identical (although you should test whether LayoutRoot is null first).

It appears to me that your are just wondering how to use a custom control in multiple places.

I've created a custom control (MyCustomControl) that has the StackPanel shown in your code, then used it multiple times on the MainPage.

MyCustomControl.xaml

<UserControl x:Class="SilverlightApplication2.MyCustomControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">

<StackPanel>
    <Button Content="Button 1" Height="30" Width="200"/>
    <Button Content="Button 2" Height="30" Width="200"/>
</StackPanel>

MyCustomControl.xaml.cs

public partial class MyCustomControl : UserControl
{
    public MyCustomControl()
    {
        InitializeComponent();
    }
}

Then I've used that custom control twice in the main view.

MainPage.xaml