我们平时自定义WPF控件的方法有：Style，DataTemplate，ControlTemplate， DependencyProperty， CustomControl等几个方法。 按照优先顺序应该是从左到右。（所谓Style，这里仅包括Setter） 对于搜索框，其组成也就是TextBox+Button（清空），这里我们用CustomControl的方法比较合适。 1.创建SearchBox继承于TextBox，并声明2个Part属性， 表明此控件组成 ~~~ [TemplatePart(Name = "PART_SearchTextBox", Type = typeof(TextBox))] ~~~ ~~~ [TemplatePart(Name = "PART_ClearButton", Type = typeof(Button))] ~~~ ~~~ public class SearchBox : TextBox ~~~ ~~~ 2.创建2个子控件的Style， 注意ControlTemplate中的子控件命名和上述属性声明一致 ~~~ ~~~ ~~~ <Style TargetType="{x:Type local:SearchBox}"> ~~~ ~~~ ~~~ <Setter Property="Template"> ~~~ ~~~ <Setter.Value> ~~~ ~~~ <ControlTemplate TargetType="{x:Type local:SearchBox}"> ~~~ ~~~ <!-------------子控件PART_SearchTextBox,PART_ClearButton及其它设置---------------> ~~~ ~~~ </ControlTemplate> ~~~ ~~~ </Setter.Value> ~~~ ~~~ </Setter> ~~~ ~~~ </Style> ~~~ ~~~ 3.如果在当前程序集里，必须放在.\Themes文件夹下; 必须在程序集的AssemblyInfo.cs里指定ThemeInfo（用来指定控件默认Style） ~~~ ~~~ ~~~ [assembly: ThemeInfo( ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located //(used if a resource is not found in the page, // or application resource dictionaries) ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located //(used if a resource is not found in the page, // app, or any theme specific resource dictionaries) )] ~~~ ~~~ 4.在自定义控件的实现中注册路由事件等等其它逻辑处理 ~~~ ~~~ 比如：对子元素Clear按钮进行处理 ~~~ ~~~ ~~~ public override void OnApplyTemplate() ~~~ ~~~ { base.OnApplyTemplate(); Button btnClear = base.GetTemplateChild("PART_ClearButton") as Button; if (btnClear != null) ~~~ ~~~ { btnClear.Click += new RoutedEventHandler(OnClearButton_Click); ~~~ ~~~ } } private void OnClearButton_Click(Object sender, RoutedEventArgs e) ~~~ ~~~ { TextBox txtSearch = base.GetTemplateChild("PART_SearchTextBox") as TextBox; if (txtSearch!= null) ~~~ ~~~ { txtSearch.Text = String.Empty; ~~~ ~~~ txtSearch.Focus(); ~~~ ~~~ } } ~~~ ~~~ ~~~ ~~~ ~~~