尝试在编辑时获取输入文件的值

Question

1）编辑html的时间代码：-

<div class="form-group col-md-4">
  <label class="label-control" for="profileofdoctor">Select Profile: 
  </label>
  <label id="projectinput8" class="file center-block">
      <input type="file" id="profileofdoctor" name="profileofdoctor" 
     [(ngModel)]="doctor.profileofdoctor" #profileofdoctor="ngModel"/>
     <span class="file-custom"></span>
  </label>
</div>

2) component file to edit all value:- 

    showEditDoctor(doctor:any):void
    {
        this.doctorToEdit = doctor;
        this.apiMessage = "";
    }


    EditDoctor(doctor:any):void
    {
        if(!doctor){ return; }
        doctor.id = this.doctorToEdit._id;
        this.doctorsService.updateDoctors(doctor)
                    .then(td => {
                      const updateDoctors = this.doctors.map(t => {
                        if(td.doctor._id !== t._id){
                          return t;
                        }
                        return { ...t, ...td.doctor };
                      })
                      this.apiMessage = td.message;
                      this.doctors = updateDoctors;
                    })
    }

我正在尝试在angular js 4的编辑时间内输入文件取值，但是我没有获取文件取值，请给我帮助！！！！

我使用MEAN js开发了一个凝结操作，并且我创建了一个医生模块，每当我单击“编辑”按钮并在文本框中获取值时，大多数值都会显示，但输入文件的值不会显示并给我错误