How to Find Specific Child WPF Controls Within a Container?

Find child WPF controls of a specific type within a container

In WPF applications, it is very useful to be able to access child controls within a container based on the control type. This can be achieved by using the GetChildOfType<T> extension method.

In your specific example, assuming you have a Grid named MyContainer that contains multiple ComboBox controls, you can get those child controls using the following code:

<code class="language-csharp">var myCombobox = this.MyContainer.GetChildOfType<ComboBox>();</code>

The

GetChildOfType<T> method recursively searches for child elements of the required type within the specified dependency object. This method takes into account the hierarchical structure of the WPF visual tree.

The following is the implementation of the extension method:

<code class="language-csharp">public static T GetChildOfType<T>(this DependencyObject depObj)
    where T : DependencyObject
{
    if (depObj == null) return null;

    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
    {
        DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
        if (child != null && child is T)
        {
            return (T)child;
        }
        T result = GetChildOfType<T>(child);
        if (result != null) return result;
    }
    return null;
}</code>

Using the GetChildOfType<T> method, you can easily retrieve the child ComboBox controls in the MyContainer Grid.

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