Use ControlTemplate or Style from resource file in WPF .cs and find the control

一、Generic.xaml中：

 <ControlTemplate x:Key="ucQuitFeeCT" TargetType="{x:Type localControls:ucQuitFee}">
        <Grid Grid.Row="1">
           
            <TabControl Grid.Row="0" x:Name="neuTabControl1" Style="{DynamicResource tabControlStyle}">
                <TabItem Header="退费(F2)" IsSelected="True" x:Name="tpQuit" Style="{DynamicResource tabItemStyle}">
                    <GroupBox Header="基本信息">
                        <DockPanel>
                                <TextBlock Width="55" Margin="5 0" VerticalAlignment="Center" >发票号:</TextBlock>
                                <!--For example look for this control-->
                                 <TextBox x:Name="tbInvoiceNO"  Width="132" VerticalAlignment="Center"></TextBox>
                        </DockPanel>

                    </GroupBox>
                </TabItem>
              
            </TabControl>
        </Grid>
    </ControlTemplate>

二、.cs中

  #region 声明控件
    
        protected TextBox tbInvoiceNO = new TextBox();
  #endregion 
  ControlTemplate thisControlTemplate = null;
        public void SetControlTemplate()
        {
    
            ResourceDictionary resourceDictionary = new ResourceDictionary();
            resourceDictionary.Source = new Uri("/程序集;component/Themes/Generic.xaml", UriKind.RelativeOrAbsolute);
            this.Resources.MergedDictionaries.Add(resourceDictionary);
            thisControlTemplate = (ControlTemplate)this.Resources["ucQuitFeeCT"];
            this.Template = thisControlTemplate;
        }
        //得到控件
        public override void OnApplyTemplate()
        {
    
            base.OnApplyTemplate();
 #region 控件赋值
             tbInvoiceNO = (TextBox)thisControlTemplate.FindName("tbInvoiceNO", this);
            #endregion 
            
            #region Bind control events 
            #endregion 
            
        }