در این مقاله می خواهیم با استفاده از تکنولوژی WPF و کدهای#C ، ماشین حساب ساده ای بنویسیم که در آن بتوانیم چهار عمل اصلی ضرب، تقسیم، جمع و تفریق را انجام دهیم.

برای شروع کار، ابتدا از برنامه Visual Studio ، یک پروژه جدید از نوع WPF  ایجاد می کنیم .

سپس با استفاده از کامپوننت های موجود، طرح زیر را پیاده سازی می کنیم.

کدهای XAML مربوط به این کامپوننت ها به شکل زیر خواهند بود :

    <Window x:Class="MyCalculatorv1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WPF Calculator" Height="310" Width="237" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" Topmost="True">  
        <Grid Background="White" Height="270" VerticalAlignment="Top">  
            <Button Content="7" HorizontalAlignment="Left" Margin="11,115,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2,2,2,1" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
      
            <TextBox Height="38" TextWrapping="Wrap" VerticalAlignment="Top" Margin="10,20,0,0" HorizontalAlignment="Left" Width="201" FontSize="20" Background="Black" BorderThickness="2" Name="tb" Text="">  
                <TextBox.Foreground>  
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}" />  
                </TextBox.Foreground>  
      
            </TextBox>  
      
            <Button Content="8" HorizontalAlignment="Left" Margin="62,115,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="9" HorizontalAlignment="Left" Margin="113,115,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="/" HorizontalAlignment="Left" Margin="164,115,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="4" HorizontalAlignment="Left" Margin="11,151,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="5" HorizontalAlignment="Left" Margin="62,151,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="6" HorizontalAlignment="Left" Margin="113,151,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="*" HorizontalAlignment="Left" Margin="164,151,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="1" HorizontalAlignment="Left" Margin="11,187,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="2" HorizontalAlignment="Left" Margin="62,187,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="3" HorizontalAlignment="Left" Margin="113,187,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="-" HorizontalAlignment="Left" Margin="164,187,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="0" HorizontalAlignment="Left" Margin="11,223,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="=" HorizontalAlignment="Left" Margin="62,223,0,0" VerticalAlignment="Top" Width="97" Height="31" FontSize="18" BorderThickness="2" Click="Result_click">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="+" HorizontalAlignment="Left" Margin="164,223,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Button_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="Off" HorizontalAlignment="Left" Margin="113,79,0,0" VerticalAlignment="Top" Width="97" Height="31" FontSize="18" BorderThickness="2" Click="Off_Click_1">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="Del" HorizontalAlignment="Left" Margin="11,79,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="Del_Click">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
            <Button Content="R" HorizontalAlignment="Left" Margin="62,79,0,0" VerticalAlignment="Top" Width="46" Height="31" FontSize="18" BorderThickness="2" Click="R_Click">    
                <Button.Foreground>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.Foreground>    
                <Button.BorderBrush>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowColorKey}}"/>    
                </Button.BorderBrush>    
                <Button.Background>    
                    <SolidColorBrush Color="{DynamicResource {x:Static SystemColors.WindowTextColorKey}}"/>    
                </Button.Background>    
            </Button>  
      
        </Grid>  
    </Window>  

حالا برای برخی دکمه های موجود در فایل، رویداد های لازم را می نویسیم.

    using System;    
    using System.Windows;    
    using System.Windows.Controls;    
        
    namespace MyCalculatorv1    
    {    
        public partial class MainWindow : Window    
        {    
            public MainWindow()    
            {    
                InitializeComponent();    
            }    
        
            private void Button_Click_1(object sender, RoutedEventArgs e)    
            {    
                Button b = (Button) sender;    
                tb.Text += b.Content.ToString();    
            }    
        
            private void Result_click(object sender, RoutedEventArgs e)    
            {    
                try    
                {    
                    result();    
                }    
                catch (Exception exc)    
                {    
                    tb.Text = "Error!";    
                }    
            }    
        
            private void result()    
            {    
                String op;    
                int iOp = 0;    
                if (tb.Text.Contains("+"))    
                {    
                    iOp = tb.Text.IndexOf("+");    
                }    
                else if (tb.Text.Contains("-"))    
                {    
                    iOp = tb.Text.IndexOf("-");    
                }    
                else if (tb.Text.Contains("*"))    
                {    
                    iOp = tb.Text.IndexOf("*");    
                }    
                else if (tb.Text.Contains("/"))    
                {    
                    iOp = tb.Text.IndexOf("/");    
                }    
                else    
                {    
                    //error    
                }    
                    
                op = tb.Text.Substring(iOp, 1);    
                double op1 = Convert.ToDouble(tb.Text.Substring(0, iOp));    
                double op2 = Convert.ToDouble(tb.Text.Substring(iOp + 1, tb.Text.Length - iOp - 1));    
        
                if (op == "+")    
                {    
                    tb.Text += "=" + (op1 + op2);    
                }    
                else if (op == "-")    
                {    
                    tb.Text += "=" + (op1 - op2);    
                }    
                else if (op == "*")    
                {    
                    tb.Text += "=" + (op1 * op2);    
                }    
                else    
                {    
                    tb.Text += "=" + (op1 / op2);    
                }    
            }    
        
            private void Off_Click_1(object sender, RoutedEventArgs e)    
            {    
                Application.Current.Shutdown();    
            }    
        
            private void Del_Click(object sender, RoutedEventArgs e)    
            {    
                tb.Text = "";    
            }    
        
            private void R_Click(object sender, RoutedEventArgs e)    
            {    
                if (tb.Text.Length > 0)    
                {    
                    tb.Text = tb.Text.Substring(0, tb.Text.Length - 1);    
                }    
            }    
        }    
    }    

در تکه کد بالا، ما عملیات ریاضی مورد نظرمان را پیاده سازی کرده ایم. در تکه کد مربوط به R_click ، برای حذف آخرین مقدار اضافه شده کدنویسی کرده ایم و در دکمه ی delete برای حذف نتیجه کدنویسی کرده ایم. از دکمه ی Off برای خروج از برنامه استفاده کرده ایم. در ماشین حساب، اگر بخواهیم عملیات جدیدی انجام بدهیم، باید ابتدا از دکمه ی delete استفاده کنیم.