如何在c＃.net的datagridview中找出单元格为空(How to find out the cell is empty in datagridview in c#.net)

 如果导航栏有权访问visible状态，那么您应该只能使用if语句来确定要显示的内容 
 
if (this.state.visible) {
  return (
    <SearchBar />
  )
} else {
  return (
    <Title />
  )
}

If the navigation bar has access to the visible state, then you should be able to just use an if statement to determine which to show
 
if (this.state.visible) {
  return (
    <SearchBar />
  )
} else {
  return (
    <Title />
  )
}