WPF中获取系统本身自带的控件模板(XAML)

       每个控件都有自己默认的模板，这是MS本身就编写好的，如果我们能够得到这些模板的XAML代码，那么它将是学习模板的最好的示例，要想获得某个控件ctrl的默认模板，请调用以下方法：

        string GetTemplateXamlCode(Control ctrl)
        {

            FrameworkTemplate template = ctrl.Template;

            string xaml = "";

            if (template != null)
            {

                XmlWriterSettings settings = new XmlWriterSettings();
                settings.Indent = true;
                settings.IndentChars = new string(' ', 4);
                settings.NewLineOnAttributes = true;

                StringBuilder strbuild = new StringBuilder();
                XmlWriter xmlwrite = XmlWriter.Create(strbuild, settings);

                try
                {
                    XamlWriter.Save(template, xmlwrite);
                    xaml = strbuild.ToString();
                }
                catch (Exception exc)
                {
                    xaml = exc.Message;
                }
            }
            else
            {
                xaml = "no template";
            }

            return xaml;
        }