checkAll(ev: any) {
 this.releaseTasks.releaseTaskDetails.forEach((x:any) => x.isChecked = ev.target.checked)
  }
 isAllChecked() {
 if(this.releaseTasks.releaseTaskDetails.length > 0
 return this.canRelease = this.releaseTasks.releaseTaskDetails.every((_:any) => _.isChecked);
  }
 return false;
  }
 
    onModalSelectedRows(task
     : 
     any) {
    
    task.
     isChecked 
     = 
     !
     task.
     isChecked;
    
    let 
     len 
     = 
     0;
    
    this.
     releaseTasks.
     releaseTaskDetails.
     forEach((item
     : 
     any) 
     =>
    if(
     item.
     isChecked) {
    
    len 
     ++;
    
    
      }
    
    
      });
    
    if(
     len 
     === 
     0) {
    
    this.
     canRelease 
     = 
     false;
    
    else{
    
    this.
     canRelease 
     = 
     true;
    
    
      }
    
    
      }
    后台的viewmodel代码

Controller 代码

var activityQuery = from op in _context.OperatorActivities
                                where op.Operator_ID == userName && !op.IsComplete && !op.IsReleased && !op.IsException 
                                select op;
            
            ReleaseTask relesaseTask = new ReleaseTask();

            if(activityQuery.Any()){
                foreach (var activity in activityQuery)
                {
                    ReleaseTaskViewModel taskDetail = new ReleaseTaskViewModel();
                    taskDetail.SAP_DeliveryOrder_ID = getOrderById(activity.DeliveryOrder_ID);
                    taskDetail.SAP_ProductOrder_ID = getProductOrderById(activity.ProductionOrder_ID);
                    taskDetail.PhaseCode = activity.ActivityCode;
                    taskDetail.isChecked = true;
                    taskDetail.OperatorActivityId = activity.OperatorActivity_ID;
                    taskDetail.DeliveryOrder_ID = activity.DeliveryOrder_ID;
                    taskDetail.ProductionOrder_ID = activity.ProductionOrder_ID;
                    taskDetail.Operator_ID = activity.Operator_ID;
                    taskDetail.OrderId = activity.ActivityCode == "MAKE" ? activity.ProductionOrder_ID : activity.DeliveryOrder_ID;
                    taskDetail.isPersistent = isPersistent(activity.ProductionOrder_ID);
                    if(!taskDetail.isPersistent) {
                        relesaseTask.ReleaseTaskDetails.Add(taskDetail);
                    }
                }
            }
            return(Ok(new { success = true, data = relesaseTask}));