泛型：改变变量值触发的事件

来源：互联网发布：linux设置root密码编辑：程序博客网时间：2024/05/22 03:07

网上查不着，非是没人会，而是懒的写，那我就整一个，或抛砖引玉：

    public class ClassVarEvent<T>    {        private T myValue;        public T MyValue        {            get { return myValue; }            set            {                if (compare(value, myValue) == false)                    WhenMyValueChange();                myValue = value;            }        }        private bool compare(T x, T y)        {            return EqualityComparer<T>.Default.Equals(x, y);        }        public delegate void MyValueChanged(object sender, EventArgs e);        public event MyValueChanged OnMyValueChanged;        public ClassVarEvent()        {            myValue = default(T);            OnMyValueChanged += new MyValueChanged(afterMyValueChanged);        }        private void afterMyValueChanged(object sender, EventArgs e)        {            //do something        }        private void WhenMyValueChange()        {            if (OnMyValueChanged != null)            {                OnMyValueChanged(this, null);            }        }    }

使用：

        private int ii = 0;        private string ss = "";        private bool bb = false;        private ClassVarEvent<int> x = new ClassVarEvent<int>();        private ClassVarEvent<string> y = new ClassVarEvent<string>();        private ClassVarEvent<bool> z = new ClassVarEvent<bool>();

。。。

            x.OnMyValueChanged += (s, ee) => { FuncIntVarChangeEvent(ii);};            y.OnMyValueChanged += (s, ee) => { FuncStringVarChangeEvent(ss); };            z.OnMyValueChanged += (s, ee) => { FuncBoolVarChangedEvent(bb); };

。。。

        private void button1_Click(object sender, EventArgs e)//整数        {            ii++;            x.MyValue = ii;            richTextBox1.Text += "\r\n" + x.MyValue.ToString();        }        private void button3_Click(object sender, EventArgs e)//字符串        {            y.MyValue += ii.ToString();            ii++;            ss = ii.ToString();            richTextBox1.Text += "\r\na_" + y.MyValue;        }        private void FuncIntVarChangeEvent(int ii)        {            richTextBox1.Text += "\r\n   触发了： " + ii.ToString();        }        private void FuncStringVarChangeEvent(string ss)        {            richTextBox1.Text += "\r\n   触发了： " + ss;        }        private void button2_Click(object sender, EventArgs e)        {            if (bb == false)                bb = true;            else                bb = false;            z.MyValue = bb;        }        private void FuncBoolVarChangedEvent(bool bbb)        {            richTextBox1.Text += "\r\n   触发了： " + bbb.ToString();        }

实例：

MDIParent 由一子窗体创建另一属于 MDIParent 的子窗体---

1. MDIParent 中：

        public static bool My_BoolVar = false;        public static T_VarEvent<bool> My_T_VarEvent = new T_VarEvent<bool>();

...

        private void FuncBoolVarChangedEvent(bool _b)        {            if (_b == true)            {                this.Cursor = Cursors.WaitCursor;                FormCitizen.FormCitizen f = new FormCitizen.FormCitizen();                f.MdiParent = this;                f.WindowState = FormWindowState.Maximized;                f.Show();

                this.Cursor = Cursors.Default;            }        }

2. 作为调用者的子窗体：

首先添加引用

然后（某个 do something）：

            客户管理系统.MDIParent.My_BoolVar = true;            客户管理系统.MDIParent.My_T_VarEvent.MyValue = true;            客户管理系统.MDIParent.My_BoolVar = false;            客户管理系统.MDIParent.My_T_VarEvent.MyValue = false;

完毕！

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