在.cs文件中创建ControlTemplate

之前的工作中遇到需要设置圆角button的问题，虽然可以在xaml中设置cornerRadius

<ControlTemplate x:Key="radiusBtnTemplate" TargetType="{x:Type ButtonBase}">
    <Border CornerRadius="5" Background="#FF19ADF0" Margin="20 10" TextBlock.Foreground="White" BorderBrush="#FF1F6BC2">
        <Viewbox>
            <TextBlock Margin="10">
                 <ContentPresenter Content="{TemplateBinding ContentControl.Content}"/>
            </TextBlock>
        </Viewbox>
    </Border>
</ControlTemplate>

但是，随着屏幕的缩放，固定大小的CornerRadius在控件大小自适应屏幕的时候，就不能保持相同的弧度了。此时需要动态的创建ControlTemplate方法

public ControlTemplate GetControlTemplate(double cornerRadius,string colorStr, Thickness? margin = null)
        {
            FrameworkElementFactory border = new FrameworkElementFactory(typeof(Border));
            border.SetValue(Border.BackgroundProperty, new SolidColorBrush((Color)ColorConverter.ConvertFromString(colorStr)));
            border.SetValue(Border.CornerRadiusProperty, new CornerRadius(cornerRadius));
            if (null != margin)
            {
                border.SetValue(Border.MarginProperty, margin);
            }

            FrameworkElementFactory vb = new FrameworkElementFactory(typeof(Viewbox));
            border.AppendChild(vb);

            FrameworkElementFactory tb = new FrameworkElementFactory(typeof(TextBlock));
            tb.SetValue(TextBlock.MarginProperty, new Thickness(10));
            vb.AppendChild(tb);

            FrameworkElementFactory cp = new FrameworkElementFactory(typeof(ContentPresenter));
            cp.SetValue(ContentPresenter.ContentProperty, new TemplateBindingExtension(ContentControl.ContentProperty));
            tb.AppendChild(cp);

            ControlTemplate ct = new ControlTemplate();
            ct.VisualTree = border;
            return ct;
        }