javascript - react : TypeError: Cannot read properties of null (reading 'useContext' ) when trying to use react-bootstrap container

Question

如标题中所述，我正在尝试创建一个布局组件，但使用任何 react-bootstrap 组件似乎都会给我错误。在这种情况下，使用我得到错误:
TypeError:无法读取 null 的属性(读取“useContext”)
此布局组件的代码如下:

import React from 'react';
import { Container } from 'react-bootstrap';

export const Layout = (props) => (
    <Container>
        {props.children}
    </Container>
    )

这是从下面的 App.js 调用的:

import React, { Component } from 'react';
import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';
import { Layout } from './components/Layout';
import { Home } from './components/Home';

import './custom.css'

class App extends Component {
  render () {
    return (
        <Layout>
            <Switch>
                <Router>
                    <Route exact path='/' component={Home} />
                </Router>
            </Switch>
      </Layout>
    );
  }
}

export default App;

用 div 替换容器标签会按预期呈现，但任何使用 react-bootstrap 都会导致 useContext 错误。

Answer 1

路由器必须在交换机之上:

<Router>
    <Layout>
        <Switch>
            <Route path="/" component={Home} />
        </Switch>
    </Layout>
</Router>

https://codesandbox.io/s/determined-zeh-r3vvl4