ProgressBarRenderer.IsSupported 属性

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

Source:

ProgressBarRenderer.cs

获取一个值， ProgressBarRenderer 该值指示该类是否可用于使用视觉样式绘制进度栏控件。

public:
 static property bool IsSupported { bool get(); };

public static bool IsSupported { get; }

static member IsSupported : bool

Public Shared ReadOnly Property IsSupported As Boolean

属性值

Boolean

true 如果用户在操作系统中启用了视觉样式，并且视觉样式应用于应用程序窗口的工作区，否则，为 false.

示例

下面的代码示例使用 IsSupported 属性来确定是否调用 DrawVerticalBar 该方法。 该代码示例是 ProgressBarRenderer 类中的一个较大示例的一部分。

    // Draw the progress bar in its normal state.
protected:
    virtual void OnPaint(PaintEventArgs^ e) override
    {
        __super::OnPaint(e);

        if (ProgressBarRenderer::IsSupported)
        {
            ProgressBarRenderer::DrawVerticalBar(e->Graphics, 
                ClientRectangle);
            this->Parent->Text = "VerticalProgressBar Enabled";
        }
        else
        {
            this->Parent->Text = "VerticalProgressBar Disabled";
        }
    }

// Draw the progress bar in its normal state.
protected override void OnPaint(PaintEventArgs e)
{
    base.OnPaint(e);

    if (ProgressBarRenderer.IsSupported)
    {
        ProgressBarRenderer.DrawVerticalBar(e.Graphics,
            ClientRectangle);
        this.Parent.Text = "VerticalProgressBar Enabled";
    }
    else
    {
        this.Parent.Text = "VerticalProgressBar Disabled";
    }
}

' Draw the progress bar in its normal state.
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs) 
    MyBase.OnPaint(e)
    
    If ProgressBarRenderer.IsSupported Then
        ProgressBarRenderer.DrawVerticalBar(e.Graphics, ClientRectangle)
        Me.Parent.Text = "VerticalProgressBar Enabled"
    Else
        Me.Parent.Text = "VerticalProgressBar Disabled"
    End If

End Sub

注解

如果此属性是false，则此类的方法和属性将引发 。InvalidOperationException

另请参阅

• VisualStyleState