c# - 事件触发事件

Question

我有一个对象在我的类(class)中是私有(private)的。如果该对象触发了一个事件，我想将该事件传递给正在使用我的类的任何对象。目前我这样做，我把我的构造函数:

cbName.CheckedChanged += ((sender, args) => this.CheckChanged(this,args));

有没有更好的方法来做到这一点，是否有任何陷阱，比如类不会被释放，因为它有一个事件给自己，我需要在释放函数中手动取消订阅？

将发件人从触发对象更改为 this 是可选的。

完整版测试代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace placeholder
{
    internal class FilterBase : UserControl, IFilterObject
    {
        public FilterBase(string name)
        {
            InitializeComponent();
            cbName.CheckedChanged += ((sender, args) => this.CheckChanged(this,args));
            cbName.Name = name;
            this.Name = name;
        }

        private CheckBox cbName;
        /// <summary> 
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary> 
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Component Designer generated code

        /// <summary> 
        /// Required method for Designer support - do not modify 
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.cbName = new System.Windows.Forms.CheckBox();
            this.SuspendLayout();
            // 
            // cbName
            // 
            this.cbName.AutoSize = true;
            this.cbName.Location = new System.Drawing.Point(4, 4);
            this.cbName.Name = "cbName";
            this.cbName.Size = new System.Drawing.Size(79, 17);
            this.cbName.TabIndex = 0;
            this.cbName.Text = "Filter Name";
            this.cbName.UseVisualStyleBackColor = true;
            // 
            // UserControl1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.AutoSize = true;
            this.AutoSizeMode = System.Windows.Forms.AutoSizeMode.GrowAndShrink;
            this.Controls.Add(this.cbName);
            this.Name = "Filter Name";
            this.Size = new System.Drawing.Size(86, 24);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        #endregion

        public event EventHandler CheckChanged;
        public bool Checked
        {
            get { return cbName.Checked; }
        }
    }
}

Answer 1

事件 实际上类似于自动属性。您可以定义自己的 add 和 remove 方法，将委托(delegate)直接传递给子控件，从而移除额外的间接级别:

public event EventHandler CheckChanged {
    add { cbName.CheckChanged += value; }
    remove { cbName.CheckChanged -= value; }
}

这将删除存储在您的类中的额外 Delegate(因为 Delegate 字段在标准事件的幕后使用)