How to simulate the event of typing the % (percentage) symbol when pressing Shift+5?

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I was developing a calculator in C#, and started doing the activation part of the buttons through the keyboard.

if (e.KeyCode == Keys.Add) 
  {
    btnsum.PerformClick();
  }

Using the code above, I already managed to do most of the activation of the buttons, but then arose my doubt.

There is a way to activate the button % (percentage) when pressing the Shift, together with the 5?

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

namespace Calculadora
{
    public partial class frmCalculadora : Form
    {
        public frmCalculadora()
        {
            InitializeComponent();
        }

        public string n1 = "", n2 = "";
        double memory = 0;
        public bool estado = false;

        class Calc
        {
            public string Op = "";

            public string Igual(string strN1, string strN2)
            {
                double n1 = Convert.ToDouble(strN1);
                double n2 = Convert.ToDouble(strN2);
                double resul = 0;

                switch (Op)
                {
                    case "/":
                        resul = n1 / n2;
                        break;
                    case "*":
                        resul = n1 * n2;
                        break;
                    case "-":
                        resul = n1 - n2;
                        break;
                    case "+":
                        resul = n1 + n2;
                        break;
                    case "mod":
                        resul = n1 % n2;
                        break;
                    case "log":
                        resul = Math.Pow(n1, n2);
                        break;
                }
                return Convert.ToString(resul);
            }
        }
        Calc c = new Calc();

        private void btn0_Click(object sender, EventArgs e)
        {
            if (estado)
            {
                txtVisor.Text = "0";
                estado = false;
            }
            else
            {
                txtVisor.Text += "0"; 
            }
        }

        private void btn1_Click(object sender, EventArgs e)
        {
            if (estado)
            {
                txtVisor.Text = "1";
                estado = false;
            }
            else
            {
                txtVisor.Text += "1";
            }
        }

        private void btn2_Click(object sender, EventArgs e)
        {
            if (estado)
            {
                txtVisor.Text = "2";
                estado = false;
            }
            else
            {
                txtVisor.Text += "2";
            }
        }

        private void btn3_Click(object sender, EventArgs e)
        {
            if (estado)
            {
                txtVisor.Text = "3";
                estado = false;
            }
            else
            {
                txtVisor.Text += "3";
            }
        }

        private void btn4_Click(object sender, EventArgs e)
        {
            if (estado)
            {
                txtVisor.Text = "4";
                estado = false;
            }
            else
            {
                txtVisor.Text += "4";
            }
        } 

        private void btn5_Click(object sender, EventArgs e)
        {
            if (estado)
            {
                txtVisor.Text = "5";
                estado = false;
            }
            else
            {
                txtVisor.Text += "5";
            }
        }

        private void btn6_Click(object sender, EventArgs e)
        {
            if (estado)
            {
                txtVisor.Text = "6";
                estado = false;
            }
            else
            {
                txtVisor.Text += "6";
            }
        }

        private void btn7_Click(object sender, EventArgs e)
        {
            if (estado)
            {
                txtVisor.Text = "7";
                estado = false;
            }
            else
            {
                txtVisor.Text += "7";
            }
        }

        private void btn8_Click(object sender, EventArgs e)
        {
            if (estado)
            {
                txtVisor.Text = "8";
                estado = false;
            }
            else
            {
                txtVisor.Text += "8";
            }
        }

        private void btn9_Click(object sender, EventArgs e)
        {
            if (estado)
            {
                txtVisor.Text = "9";
                estado = false;
            }
            else
            {
                txtVisor.Text += "9";
            }
        }

        private void btnsum_Click(object sender, EventArgs e)
        {
            try{
            n1 = txtVisor.Text;
            c.Op = "+";
            estado = true;
            }
            catch 
            {
                return;
            }
        }

        private void btnmin_Click(object sender, EventArgs e)
        {
            try{
            n1 = txtVisor.Text;
            c.Op = "-";
            estado = true;
            }
            catch 
            {
                return;
            }
        }

        private void btnmult_Click(object sender, EventArgs e)
        {
            try{
            n1 = txtVisor.Text;
            c.Op = "*";
            estado = true;
            }
            catch 
            {
                return;
            }
        }

        private void btndiv_Click(object sender, EventArgs e)
        {
            try{
            n1 = txtVisor.Text;
            c.Op = "/";
            estado = true;
            }
            catch 
            {
                return;
            }
        }

        private void btnraiz_Click(object sender, EventArgs e)
        {
            try{
            n1 = txtVisor.Text;
            double doubleN1 = Convert.ToDouble(n1);

            double result = Math.Sqrt(doubleN1);
            txtVisor.Text = Convert.ToString(result);
            }
            catch 
            {
                return;
            }
        }

       private void btnporc_Click(object sender, EventArgs e)
        {
           try{
            double N1 = Convert.ToDouble(n1); 
            double N2 = Convert.ToDouble(txtVisor.Text);
            txtVisor.Text = Convert.ToString(N1 * N2 /100);
           }
           catch 
           {
               return;
           }
        }

        private void btnigu_Click(object sender, EventArgs e)
        {
            try{
            n2 = txtVisor.Text;
            txtVisor.Text = c.Igual(n1, n2);
            }
            catch 
            {
                return;
            }
        }

        private void btnmod_Click(object sender, EventArgs e)
        {
            try{
            n1 = txtVisor.Text;
            c.Op = "mod";
            estado = true;
            }
            catch 
            {
                return;
            }
        }

        private void btnlog_Click(object sender, EventArgs e)
        {
            try{
            n1 = txtVisor.Text;
            c.Op = "log";
            estado = true;
            }
            catch 
            {
                return;
            }
        }

        private void btnvirgula_Click(object sender, EventArgs e)
        {
            try{
            int virg;
            virg = txtVisor.Text.IndexOf(",");   
            if (virg >= 0)                    
                return;
            else                           
            txtVisor.Text += ",";
            }
            catch 
            {
                return;
            }
        }

        private void btnclear_Click(object sender, EventArgs e)
        {
            txtVisor.Text = "";
            n1 = "0";
            n2 = "0";
            c.Op = "0";
        }

        private void btnback_Click(object sender, EventArgs e)
        {
            try{
            char[] arr = txtVisor.Text.ToCharArray();

            string txt = "";

            int tamanho = arr.Length;

            for (int i = 0; i < arr.Length; i++)
            {

                if (i + 1 != tamanho)
                {

                    txt += arr[i].ToString();

                }

            }

            txtVisor.Text = txt;
            }
            catch 
            {
                return;
            }

        }

        private void btnpot_Click(object sender, EventArgs e)
        {
            try{
            double N1 = Convert.ToDouble(txtVisor.Text);
            txtVisor.Text = Convert.ToString((N1 * N1) * N1);
            }
            catch 
            {
                return;
            }
        }

        private void btn_inverter_Click(object sender, EventArgs e)
        {
            try{
            double n1 = double.Parse(txtVisor.Text) * (-1);
            txtVisor.Text = n1.ToString();
            }
            catch 
            {
                return;
            }
        }

        private void btn_quadrado_Click(object sender, EventArgs e)
        {
            try{
            double N1 = Convert.ToDouble(txtVisor.Text);
            txtVisor.Text = Convert.ToString(N1 * N1);
            }
            catch 
            {
                return;
            }
        }

        private void btn_inv_Click(object sender, EventArgs e)
        {
            try
            {
                double d = double.Parse(txtVisor.Text);
                if (d == 0)
                {
                    return;
                }
                else
                {
                    d = 1 / d;
                    txtVisor.Text = d.ToString();
                }
            }
            catch
            {
                    return;
            }
        }

        private void btnCE_Click(object sender, EventArgs e)
        {
            try{
            txtVisor.Text = "";
            }
            catch 
            {
                return;
            }
        }

        private void btnmmais_Click(object sender, EventArgs e)
        {
            try{
            memory += Convert.ToDouble(txtVisor.Text);
            txtVisor.Clear();
            }
            catch 
            {
                return;
            }
        }

        private void btnmclear_Click(object sender, EventArgs e)
        {
            try{
            memory = Convert.ToDouble("0");
            txtVisor.Clear();
            }
            catch 
            {
                return;
            }
        }

        private void btnmmenos_Click(object sender, EventArgs e)
        {
            try{
            memory -= Convert.ToDouble(txtVisor.Text);
            txtVisor.Clear();

            }catch{
                return;
            }
        }

        private void btnmresult_Click(object sender, EventArgs e)
        {
            try{
            txtVisor.Text = Convert.ToString(memory);
            }
            catch
            {
                return;
            }
        }

        private void btnmsave_Click(object sender, EventArgs e)
        {
            try{
            memory = Convert.ToDouble(txtVisor.Text);
            txtVisor.Clear();
            }
            catch
            {
                return;
            }
        }

        private void txtVisor_TextChanged(object sender, EventArgs e)
        {

        }

        private void Form1_KeyPress(object sender, KeyEventArgs e)
        { 
            if (e.KeyCode == Keys.Add) 
            {
                btnsum.PerformClick();
            }
            else if (e.KeyCode == Keys.Subtract)
            {
                btnmin.PerformClick();
            }
            else if (e.KeyCode == Keys.Multiply)
            {
                btnmult.PerformClick();
            }
            else if (e.KeyCode == Keys.Divide)
            {
                btndiv.PerformClick();
            }
            else if (e.KeyCode == Keys.Enter || e.KeyCode == Keys.Separator)
            {
                btnigu.PerformClick();
            }
            else if (e.KeyCode == Keys.D0 || e.KeyCode == Keys.NumPad0)
            {
                btn0.PerformClick();
            }
            else if (e.KeyCode == Keys.D1 || e.KeyCode == Keys.NumPad1)
            {
                btn1.PerformClick();

            }
            else if (e.KeyCode == Keys.D2 || e.KeyCode == Keys.NumPad2)
            {
                btn2.PerformClick();

            }
            else if (e.KeyCode == Keys.D3 || e.KeyCode == Keys.NumPad3)
            {
                btn3.PerformClick();

            }
            else if (e.KeyCode == Keys.D4 || e.KeyCode == Keys.NumPad4)
            {
                btn4.PerformClick();

            }
            else if (e.KeyCode == Keys.D5 || e.KeyCode == Keys.NumPad5)
            {
                btn5.PerformClick();

            }
            else if (e.KeyCode == Keys.D6 || e.KeyCode == Keys.NumPad6)
            {
                btn6.PerformClick();

            }
            else if (e.KeyCode == Keys.D7 || e.KeyCode == Keys.NumPad7)
            {
                btn7.PerformClick();
            }
            else if (e.KeyCode == Keys.D8 || e.KeyCode == Keys.NumPad8)
            {
                btn8.PerformClick();

            }
            else if (e.KeyCode == Keys.D9 || e.KeyCode == Keys.NumPad9)
            {
                btn9.PerformClick();

            }
            else if (e.KeyCode == Keys.Decimal || e.KeyCode == Keys.OemPeriod || e.KeyCode == Keys.Oemcomma || e.KeyCode == Keys.None)
            {
                btnvirgula.PerformClick();

            }
            else if (e.KeyCode == Keys.Back)
            {
                btnback.PerformClick();

            }
            else if (e.KeyCode == Keys.Delete)
            {
                btnclear.PerformClick();

            }
            else if (e.KeyCode == Keys.Delete)
            {
                btnback.PerformClick();

            }
            else if (e.Modifiers == Keys.Shift && e.KeyCode == Keys.D5)
            {
                btnporc.PerformClick();
            }


        }

    }

}
c# winforms
  • 1

    Post more of your code to better understand the scope. What I posted will know when shift and 5 are pressed.

1 answer

3


You will have to combine the properties KeyCode and Modifiers to form the "%":

if (e.Modifiers == Keys.Shift && e.KeyCode == Keys.D5)
    //seu código

or directly access the property Shift:

if (e.Shift && e.KeyCode == Keys.D5)
    //seu código

Response update

To perform the percentage operation without this key being inserted in the textbox, you will need to use the Keypress event.
The Keydown event, the one you used, is after the key has already been pressed, with this, would have to make some POG to get around this - unnecessary.

See how it looks to me:

private void frmCalculadora_KeyPress(object sender, KeyPressEventArgs e) {
    if (e.KeyChar.ToString() == "%") {
        btnPercent.PerformClick();
        e.Handled = true;
    }
}

To prevent the character from being inserted in the text, set to true the property Handled after calling the event click.

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