LINQ使用

Posted 2020-08-11 pkyou

基于扩展方法和lamda表达式

1. 查询序列中满足一定条件 Where扩展方法

public interface ISlotPortBinding
    {
        byte SlotNumber { get; set; }
        string PortName { get; set; } 
    }

private List<ISlotPortBinding> _slotPortBindings;

var firstBinding = _slotPortBindings.Where(x => x.SlotNumber <= 4).ToList();

2.序列属性赋值ForEach扩展方法

firstBinding.ForEach(x => x.PortName = “name”); 

 部分代码参考：

public void RefreshPortNames(string slot14Port, string slot58Port)
        {
            var firstBinding = _slotPortBindings.Where(x => x.SlotNumber <= 4).ToList();
            var secondBinding = _slotPortBindings.Where(x => x.SlotNumber >= 4).ToList();

            var slotPortBinding = firstBinding.FirstOrDefault();
            bool isFirstBindingChanged = slotPortBinding != null && slotPortBinding.PortName != slot14Port;
            
            var firstOrDefault = secondBinding.FirstOrDefault();
            bool isSecondBindingChanged = firstOrDefault != null && firstOrDefault.PortName != slot58Port;

            if (isFirstBindingChanged)
            {
                firstBinding.ForEach(x => x.PortName = slot14Port); 
            }
            if (isSecondBindingChanged)
            {
                secondBinding.ForEach(x => x.PortName = slot58Port);
            }
            if (isFirstBindingChanged || isSecondBindingChanged)
            {
                SlotNumberChangedEvent?.Invoke(_currentSlotPortBinding);
            }
            //刷新页面
        }