如何将更多参数传递给 Winform 控件事件？答案

【问题标题】：How to pass more params to Winform control event?如何将更多参数传递给 Winform 控件事件？
【发布时间】：2022-01-24 23:46:52
【问题描述】：

我尝试将 3 个额外的 int 参数传递给 button1_Click 事件

private void button1_Click(object sender, EventArgs e, int Xaxis, int Yaxis, int Zaxis)
    {
        switch (Xaxis)
        ...
        textBox1.Text = "Finished";
    }
...

实现↓↓↓

...
public void Func1()
   {
      button1_Click(sender, e, 16, 5, 59)   //Pass 16 5 59 to event button1_Click
      //To perform a click event simulation with designated params
      ...
   }

private void button2_Click(object sender, EventArgs e)
    {
        ...
        Func1();
    }

但是Form1.Designer.cs有问题

this.button1.Click += new System.EventHandler(this.button1_Click);
//Compiler Error CS0123: No overload for 'method' matches delegate 'delegate'

如何正确地将 3 个额外的 int 参数传递给 button1_Click 事件？

【问题讨论】：

如果有人真的点击了按钮，当它调用事件时，你希望在你的额外参数中传递什么值？

标签： c# .net winforms .net-framework-4.8

【解决方案1】：

我建议提取一个方法，让我们分开业务逻辑（axis 例程）和UI（按钮点击事件处理）：

private void MyClick(Button button, int Xaxis, int Yaxis, int Zaxis) {
  //TODO: All business logic here
  switch (Xaxis)
  ...
  textBox1.Text = "Finished";
}

那就用吧

// Just UI event handler
private void button1_Click(object sender, EventArgs e) {
  //TODO: put right axis values here
  MyClick(sender as Button, 0, 0, 0);
}

public void Func1()
{
  MyClick(button1, 16, 5, 59);   // Pass 16 5 59 
  //To perform a click event simulation with designated params
  ...
}

// Another UI event handler
private void button2_Click(object sender, EventArgs e)
{
    ...
    Func1();
}

【讨论】：

【解决方案2】：

这是此答案的最通用版本，它以称为AxisAction 的形式完全定义了一个事件，它由不同的按钮订阅，以便用特定的参数触发。数据本身包含在一个名为Axis 的struct 中，以便将{X,Y,Z} 保持在一起。

// Your data model
public readonly struct Axis
{
    public Axis(int x, int y, int z)
    {
        this.X = x;
        this.Y = y;
        this.Z = z;
    }

    public int X { get; }
    public int Y { get; }
    public int Z { get; }
}

// Your event arguments
public class MyEventArgs : EventArgs
{
    public MyEventArgs(Axis axis)
    {
        Axis = axis;
    }

    public Axis Axis { get; }
}

// Your event method
public delegate void AxisEventHandler(object sender, MyEventArgs e);

public partial class Form1 : Form
{
    // Your event
    public event AxisEventHandler AxisAction;

    public Form1()
    {
        InitializeComponent();
    }

    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);

        // Subscribe to event
        AxisAction += Form1_AxisAction;
    }

    private void Form1_AxisAction(object sender, MyEventArgs e)
    {
        // Handle the event here
        switch (e.Axis.X)
        {
            default:
                break;
        }
        // done!
    }

    private void button1_Click(object sender, EventArgs e)
    {
        // Trigger your event from the mouse click
        OnAxisAction(new MyEventArgs(new Axis(16, 5, 59)));
    }
    private void button2_Click(object sender, EventArgs e)
    {
        // Trigger your event from the mouse click
        OnAxisAction(new MyEventArgs(new Axis(-6, 2, 8)));
    }

    private void OnAxisAction(MyEventArgs e)
    {
        // Call any event handlers on event trigger
        AxisAction?.Invoke(this, e);
    }
}

【讨论】：