private void radioButton4_CheckedChanged(object sender, EventArgs e)     //二进制radiobutton
        {
            if (this.radioButton4.Checked)
            {
                convertstring(4);
            }
        }

        private void radioButton3_CheckedChanged(object sender, EventArgs e)  //八进制radiobutton
        {
            if (this.radioButton3.Checked)
            {
                convertstring(3);
            }
        }

        private void radioButton2_CheckedChanged(object sender, EventArgs e)   //十进制radiobutton
        {
            if (this.radioButton2.Checked)
            {
                convertstring(2);
            }
        }
       private void radioButton1_CheckedChanged(object sender, EventArgs e)  //十六进制radiobutton
        {
            if (this.radioButton1.Checked)
            {
                convertstring(1);
            }
        }
        public void convertstring(int th)
        {
            switch (th)
            {
                case 1:
                    intvalue = Convert.ToInt32(txtResult.Text, frombase);
                    value = Convert.ToString(intvalue, 16);
                    txtResult.Text = value.ToString();
                    frombase = 16;
                    break;
                case 2:
                    intvalue = Convert.ToInt32(txtResult.Text, frombase);
                    value = Convert.ToString(intvalue, 10);
                    txtResult.Text = value.ToString();
                    frombase = 10;
                    break;
                case 3:
                    intvalue = Convert.ToInt32(txtResult.Text, frombase);
                    value = Convert.ToString(intvalue, 8);
                    txtResult.Text = value.ToString();
                    frombase = 8;
                    break;
                case 4:
                    intvalue = Convert.ToInt32(txtResult.Text, frombase);
                    value = Convert.ToString(intvalue, 2);
                    txtResult.Text = value.ToString();
                    frombase = 2;
                    break;

            }
        }
        为什么运行后没有作用？？？？