C#使用TextBox作数据输入方法

private void Botton_Float_Click(object sender, EventArgs e)
 {
     if (button1.Text == "关闭串口")
     {
         if(TextBox_Tem_Cal.Text != String .Empty) //判断数据输入框是否为空
         {
             HexMath CRC = new HexMath();
             Byte[] buffer = new Byte[6];
             
             float tem_cal_float = float.Parse(TextBox_Tem_Cal.Text);
             Byte[] float_byte_array = new Byte[4];
             float_byte_array = FloatToBytes(tem_cal_float);

             buffer[0] = float_byte_array[0];
             buffer[1] = float_byte_array[1];
             buffer[2] = float_byte_array[2];
             buffer[3 ] = float_byte_array[3];
             
             CRC.CalculateCrc16(buffer, out buffer[5], out buffer[4]);
             serialPort1.Write(buffer, 0, 6);
         }
        else
         {
             MessageBox.Show("校准数据不能为空");
         }
     }
     else
     {
         MessageBox.Show("串口未打开");
     }
 }

private void TextBox_Tem_Cal_KeyPress(object sender, KeyPressEventArgs e)//在TextBox中按下按键时触发事件，保证只能输入数字
{
    //判断按键是不是要输入的类型。
    if (((int)e.KeyChar < 48 || (int)e.KeyChar > 57) && (int)e.KeyChar != 8 && (int)e.KeyChar != 46)
        e.Handled = true;

    //小数点的处理。
    if ((int)e.KeyChar == 46)                           //小数点
    {
        if (TextBox_Tem_Cal.Text.Length <= 0)
            e.Handled = true;   //小数点不能在第一位
        else
        {
            float f;
            float oldf;
            bool b1 = false, b2 = false;
            b1 = float.TryParse(TextBox_Tem_Cal.Text, out oldf);
            b2 = float.TryParse(TextBox_Tem_Cal.Text + e.KeyChar.ToString(), out f);
            if (b2 == false)
            {
                if (b1 == true)
                    e.Handled = true;
                else
                    e.Handled = false;
            }
        }
    }
}

private static byte[] FloatToBytes(float data) 
{
    unsafe
    {
        byte* pdata = (byte*)&data;
        byte[] byteArray = new byte[sizeof(float)];
        for (int i = 0; i < sizeof(float); ++i)
            byteArray[i] = *pdata++;
        return byteArray;
    }
}
private static float BytesToFloat(byte[] data)
{
    unsafe
    {
        float a = 0.0F;
        byte i;
        byte[] x = data;
        void* pf;
        fixed (byte* px = x)
        {
            pf = &a;
            for (i = 0; i < data.Length; i++)
            {
                *((byte*)pf + i) = *(px + i);
            }
        }
        return a;
    }
}