Reactjs Saga watcher未接收或处理已调度的操作

我有一个守望者传奇，它不断地倾听某种类型的行动。这是从saga.run（）启动的。当它收到某种类型的动作时，它应该调用另一个执行异步动作的传奇。然而，第二个传奇中的断点永远不会被调用

因此，要么是源代码没有正确地分派操作，要么是watcher saga配置错误

守望者传奇代码

import { all, fork, takeLatest } from 'redux-saga/effects'
import {fetchItems} from './itemsSaga';

function* watchLoadItemsRequest() {
  while(true) {
    yield takeLatest('FETCH_ITEMS_REQUEST', fetchItems);
  }
}    

export default function* root() {
  yield all ([
    fork(watchLoadItemsRequest)
  ])
}

我的itemsSaga（没有被调用）

我的商店创建代码

import { applyMiddleware, createStore } from 'redux';
import createSagaMiddleware from 'redux-saga';

import reducers  from '../reducers';
import watchersSaga from '../sagas/watchersSaga';

export default function getStore() {
const sagaMiddleware = createSagaMiddleware();

    const store = createStore(
      reducers, applyMiddleware(sagaMiddleware)
    );

    sagaMiddleware.run(watchersSaga);

    return store;
  }  

最后是应该发送FETCH\u ITEMS\u请求操作的控件

import * as React from 'react';
import { connect, Dispatch } from 'react-redux';
import ItemEntity from './api/itemEntity';
import './App.css';
import IStoreState from './interfaces/IStoreState';

interface IContentProps {
  groupingType : string,
  items: ItemEntity[],
  loadItems : () => void
}

class MyContent extends React.Component<IContentProps,{}> {

  constructor(props: any) {
    super(props);
  }

  public componentDidMount() {
    this.props.loadItems();
  }

  public render() {
    return (
      <div className="Center-content">
        <div className="Center-content White">
        <br/><br/>Grouped by {this.props.groupingType}<br/><br/>{this.props.items.length} items loaded
        </div>
      </div>
    );
  }


}

function mapStateToProps(state: IStoreState) {
  return {
    groupingType: state.navigation.groupingType,
    trades: state.item.items
  };
}    

const mapDispatchToProps = (dispatch: Dispatch) => {
  return {
    loadItems: () => dispatch({type:'FETCH_ITEMS_REQUEST'})
  }
}

export default connect(mapStateToProps, mapDispatchToProps)(PnlContent);

---

这似乎不是对收到的FETCH\u ITEMS\u请求消息的响应，也不是为任何有类似问题的人调用fetchItems，最后我将我的watchers Saga改为

function* watchLoadTradesRequest() {
    yield takeEvery('FETCH_TRADES_REQUEST', fetchTrades);
}

// Register all your watchers
export default function* watchersRootSaga() {
  yield all ([
    watchLoadTradesRequest()
  ])
}

while(true) {
    yield takeLatest('FETCH_ITEMS_REQUEST', fetchItems);
  }

function* watchLoadTradesRequest() {
    yield takeEvery('FETCH_TRADES_REQUEST', fetchTrades);
}

// Register all your watchers
export default function* watchersRootSaga() {
  yield all ([
    watchLoadTradesRequest()
  ])
}