从另一个UserControl WPF修改UserControl的文本块

Question

i have a UserControl that contains a TextBox now i am loading another UserControl that contains a TextBlock .When the button is clicked, I want to assign value entered in TextBox to TextBlock of another control that is loaded. How can i do this ?

Main UserControl

<UserControl x:Class="IntelliVentory.UserControls.CategoryControl"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
         mc:Ignorable="d" 
         d:DesignHeight="670" d:DesignWidth="1100">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto" />
            <RowDefinition Height="auto" />
            <RowDefinition Height="auto" />
        </Grid.RowDefinitions>  
        <TextBox Grid.Row="0" Name="CategoryNameBox" Width="350" />
        <Button Grid.Row="1" Click="AddCategoryFunc">Load Another Control</Button>
        <Grid Grid.Row="2" Name="CategoriesWraper"></Grid>
    </Grid>
</UserControl>  

Another UserControl

<UserControl x:Class="IntelliVentory.UserControlModules.CategoryModule"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         xmlns:local="clr-namespace:IntelliVentory.UserControlModules"
         xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
         mc:Ignorable="d" 
         d:DesignHeight="450" d:DesignWidth="800">
    <Grid>
        <TextBlock Name="CategoryName" FontSize="12" FontWeight="Thin">Category Name Here</TextBlock>
    </Grid>
</UserControl>  

Main UserControl.cs Loading another UserControl.

private void AddCategoryFunc(object sender, RoutedEventArgs e)
{
    UserControl categoryMod = new CategoryModule();
    CategoriesWraper.Children.Add(categoryMod);
}

Answer 1

You want to have something like

categoryMod.CategoryNameValue = categoryControl.CategoryNameValue;

So you need to define two properties, one CategoryNameValue property with which you get the Text value of the TextBox, and one CategoryNameValue property with which you can set the Text property of the TextBlock.

Define this property in the CategoryControl class,

public string CategoryNameValue { get { return CategoryNameBox.Text; }

And this in CategoryModule class,

public string CategoryNameValue { set { CategoryName.Text = value; }

And you can start using them in your code.

You can define them as Dependency Properties instead of plain CLR properties, and then look to use data binding . With data binding both user controls can be bound to the same data model so their values are synced automatically.

Edit:

Turns out you can access a UserControl's child elements from outside as if they are public fields. That is, you can write code like this without having to define new properties

CategoryModule categoryMod = new CategoryModule();
categoryMod.CategoryName.Text = CategoryNameBox.Text; 
CategoriesWraper.Children.Add(categoryMod);