VisualStyleRenderer.IsElementDefined(VisualStyleElement) Method

Reference

Definition

Namespace:: System.Windows.Forms.VisualStyles

Assembly:: System.Windows.Forms.dll

Source:: VisualStyleRenderer.cs

Source:: VisualStyleRenderer.cs

Source:: VisualStyleRenderer.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Determines whether the specified visual style element is defined by the current visual style.

public:
 static bool IsElementDefined(System::Windows::Forms::VisualStyles::VisualStyleElement ^ element);

public static bool IsElementDefined (System.Windows.Forms.VisualStyles.VisualStyleElement element);

static member IsElementDefined : System.Windows.Forms.VisualStyles.VisualStyleElement -> bool

Public Shared Function IsElementDefined (element As VisualStyleElement) As Boolean

Parameters

element: VisualStyleElement

A VisualStyleElement whose class and part combination will be verified.

Returns

Boolean

true if the combination of the ClassName and Part properties of element are defined; otherwise, false.

Exceptions

InvalidOperationException

The operating system does not support visual styles.

-or-

Visual styles are disabled by the user in the operating system.

-or-

Visual styles are not applied to the client area of application windows.

Examples

The following code example demonstrates how to use the IsElementDefined method to determine whether to initialize a VisualStyleRenderer to a given VisualStyleElement. This code example is part of a larger example provided for the VisualStyleRenderer class overview.

    // Set the VisualStyleRenderer to a new element.
private:
    bool SetRenderer(VisualStyleElement^ element)
    {
        if (!VisualStyleRenderer::IsElementDefined(element))
        {
            return false;
        }

        if (renderer == nullptr)
        {
            renderer = gcnew VisualStyleRenderer(element);
        }
        else
        {
            renderer->SetParameters(element);
        }

        return true;
    }

// Set the VisualStyleRenderer to a new element.
private bool SetRenderer(VisualStyleElement element)
{
    if (!VisualStyleRenderer.IsElementDefined(element))
    {
        return false;
    }

    if (renderer == null)
    {
        renderer = new VisualStyleRenderer(element);
    }
    else
    {
        renderer.SetParameters(element);
    }

    return true;
}

' Set the VisualStyleRenderer to a new element.
Private Function SetRenderer(ByVal element As _
    VisualStyleElement) As Boolean

    If Not VisualStyleRenderer.IsElementDefined(element) Then
        Return False
    End If

    If renderer Is Nothing Then
        renderer = New VisualStyleRenderer(element)
    Else
        renderer.SetParameters(element)
    End If

    Return True
End Function

Remarks

This method checks the value of the IsSupported property internally.

Applies to

Jaa