从函数中触发事件

如何在函数中触发事件?在下面的示例中,当 componentDidUpdate 发射 this.testHandle() 火,但是 this.handleFilterByClass() 根本不会开火。我想这和事件有关。我错过了什么?

componentDidUpdate(prevProps, prevState) {
  if (prevProps.studentUserProfiles.length !== this.props.studentUserProfiles.length) {
    this.handleFilterByClass();
    this.testHandle();
  }
}

testHandle() {
  console.log('testHandle');
}
handleFilterByClass = classId => (event) => {
  console.log(111);
}