How Can I Efficiently Retrieve Specific Child Control Types in Windows Forms?

Efficient acquisition of specific types of sub -controls in Windows Forms

When designing the Windows Forms application, you often need to access specific subconsters, such as buttons or text boxes. Although the use of recursive functions iterates all controls seem to be a feasible solution, there are more effective methods.

Method 1: Type filtering with the type of Controls

The Controls property of the Windows window allows access to the set of all sub -controls. By using the Gettype () method for a single control, you can filter the set to obtain a specific type of control:

This method provides a fast and concise way to retrieve all matching sub -controls.

<code class="language-vb.net">Dim ctrls() As Control
ctrls = Me.Controls.OfType(GetType(TextBox)).ToArray()</code>

Method 2: Use the linq expansion method

or, you can use the linq expansion method to obtain greater flexibility. The following code demonstrates this method:

This grammar combines the OFTYPE operator with the Linq query expression, and filter the Controls collection according to the required type.

Method 3: The recursive function used for nested controls

<code class="language-vb.net">Dim Ctrls = From ctrl In Me.Controls Where TypeOf ctrl Is TextBox</code>

If you need to retrieve the subcontree in other controls, you can use recursive functions. The following example function demonstrates this method:

By recuble, this function traverses all levels of sub -controls and screens according to the specified type.

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