reactjs – React-Redux：找不到mapDispatchToProps方法

我的印象是,添加到mapDispatchToProps的方法应该可以被this.props访问.当我调用这些方法时,会引发“未捕获的TypeError：this.props.onHighlight不是函数”.
有谁知道发生了什么？一直在为mapDispatchToProps尝试一堆不同的替代品,但它们都不起作用.

import React from 'react';
    import { addHighlight,deleteHighlight,selectHighlight } from 'actions/highlight';
    import { connect } from 'react-redux';
    import jquery from 'jquery';
    import { styles } from './styles.scss';

    const mapDispatchToProps = dispatch => {
      return {
        onHighlight: (start,end,selectedText) => {
          dispatch(addHighlight(start,selectedText));
        },onDeleteHighlight: (source) => {
          dispatch(deleteHighlight(source));
        },onSelectHighlight: (source) => {
          dispatch(selectHighlight(source));
        }
      };
    }

    const mapStateToProps = state => {
      return { highlights: state.highlights,currentTopic: state.currentTopic,selectedHighlight: state.selectedHighlight,};
    }

    ...
    Other code about Highlight object 
    ...

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

import { bindActionCreators } from 'redux'

const mapDispatchToProps = dispatch => {
      return bindActionCreators({
        onHighlight: addHighlight,onDeleteHighlight: deleteHighlight,onSelectHighlight: selectHighlight
      },dispatch);
    }