Multicast delegation in C # implements multi-form communication

</pre>      In a delegate, a unicast delegate can only invoke one method, there is another method in the delegate, the method can be implemented to invoke more than one method, called a multicast delegate, the way is "+ =", the implementation of calling multiple methods, you can also use "-=" Remove the fixed method. Following the previous article, we will implement multi-form communication. <p></p><p> main form </p><pre name= "code" class= "CSharp" >namespace morecontact{//<    Summary>///delegate definition//</summary> public delegate void Morecontactdelegate (string word);        Public partial class Frmmain:form {//Declaration delegate Morecontactdelegate Message;            Public Frmmain () {InitializeComponent ();            Form instantiation FrmOther1 f1 = new FrmOther1 ();            FrmOther2 F2 = new FrmOther2 ();            FrmOther3 F3 = new FrmOther3 (); F1.            Show (); F2.            Show (); F3.            Show (); Call a delegate variable to associate a method with a Message = F1.            Receive; Message + = F2.            Receive; Message + = F3.        Receive;        } private string Word;      Implement a fixed method by clicking Invoke Delegate private void Button1_Click (object sender, EventArgs e) {      Word = TextBox1.Text;        Message (word);            private void Button2_Click (object sender, EventArgs e) {word = "";            Message (word);        TextBox1.Text = ""; }    }}

From the form 1-3 program are all the same:

<pre name= "code" class= "CSharp" >namespace morecontact{public    partial class Frmother1:form    {        Public FrmOther1 ()        {            InitializeComponent ();        }        Define method public        void Receive (string word)        {            TextBox1.Text = Word;}}    }

Implementation results:

Multicast delegation in C # implements multi-form communication