当WPF窗口显示后 如果想设置某个输入框为默认焦点 使用 FocusManager

<Grid FocusManager.FocusedElement="{Binding ElementName=inputbox}">



        <TextBox Name="inputbox" HorizontalAlignment="Left" Height="24" Margin="10,10,0,0"




                 Text="{Binding SearchText, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" 



                 TextWrapping="Wrap" VerticalAlignment="Top" Width="161">



            <TextBox.InputBindings>




                <!--键盘事件绑定-->




                <KeyBinding Command="{Binding Search_Click}" Key="Enter"/>




            </TextBox.InputBindings>




        </TextBox>




    </Grid>

WPF窗口默认TextBox焦点