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Wednesday, August 24, 2011

Runtime Assign Method using Delegate


Writing Plug-in Methods with Delegates




A delegate variable is assigned a method dynamically. This is useful for writing plug-
in methods. In this example, we have a utility method named  Add,Sub that applies
a NumberOper . The NumberOper method has a delegate
parameter,


   ///

        /// delegate  declaration
        ///

        ///
        ///
        ///
        public delegate int NumberOperation(int fvalue, int svalue);
        ///

        /// Button click event it will call NumberOper method
        ///

        ///
        ///
        private void btnClick_Click(object sender, EventArgs e)
        {
            int a = Convert.ToInt16(txtfvalue.Text);
            int b = Convert.ToInt16(txtsvalue.Text);
            txtresult.Text = NumberOper(a, b, Add).ToString();//Dynamic we Assign Method name
        }
        ///

        /// Button click event it will call NumberOper method
        ///

        ///
        ///
        private void btnSub_Click(object sender, EventArgs e)
        {

            int a = Convert.ToInt16(txtfvalue.Text);
            int b = Convert.ToInt16(txtsvalue.Text);
            txtresult.Text = NumberOper(a, b, Sub).ToString(); //Dynamic we Assign Method name

        }

        ///

        /// Main Method with delegate Parameter
        ///

        /// first value
        /// second value
        /// Dynamic Delegate
        /// call method add or sub and return result
        public int NumberOper(int a, int b, NumberOperation AT)
        {

          return   AT(a, b);
        }

        ///

        /// Add two numbers Methos
        ///

        /// first Value
        /// Second value
        /// Result
        public int Add(int a, int b)
        {
            return a + b;
        }
        ///

        /// Sub two number
        ///

        /// first value
        /// Second value
        /// int value
        public int Sub(int a, int b)
        {
            return a - b;
        }



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