summarizing examples ExamRef70-483#6

Author: camielluijkx

LISTING 4-10 The DirectoryInfo class/LISTING 4-10 The DirectoryInfo class/Program.cs

@@ -1,7 +1,6 @@
 using System;
 using System.IO;
 
-
 namespace LISTING_4_10_The_DirectoryInfo_class
 {
     class Program
@@ -22,4 +21,4 @@ static void Main(string[] args)
             Console.ReadKey();
         }
     }
-}
+}

LISTING 4-11 Using Path/LISTING 4-11 Using Path/Program.cs

@@ -7,7 +7,6 @@ class Program
     {
         static void Main(string[] args)
         {
-
             string fullName = @"c:\users\rob\Documents\test.txt";
 
             string dirName = Path.GetDirectoryName(fullName);
@@ -24,7 +23,6 @@ static void Main(string[] args)
             Console.WriteLine("New test: {0}", newTest);
 
             Console.ReadKey();
-
         }
     }
-}
+}

LISTING 4-12 C sharp programs/LISTING 4-12 C sharp programs/Program.cs

@@ -28,4 +28,4 @@ static void Main(string[] args)
             Console.ReadKey();
         }
     }
-}
+}

LISTING 4-13 httpWebRequest/LISTING 4-13 httpWebRequest/Program.cs

@@ -20,4 +20,4 @@ static void Main(string[] args)
             Console.ReadKey();
         }
     }
-}
+}

LISTING 4-14 TCP over sockets/LISTING 4-14 TCP over sockets/Program.cs

@@ -176,7 +176,6 @@ private static string ReceiveMessageTCP(out string message)
             return response;
         }
 
-
         /// <summary>
         /// Closes an open connection
         /// </summary>
@@ -257,4 +256,4 @@ static void Main(string[] args)
             WebRequest x = WebRequest.Create("url");
         }
     }
-}
+}

LISTING 4-15 PageViewer/LISTING 4-15 PageViewer/App.xaml.cs

@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Configuration;
-using System.Data;
-using System.Linq;
-using System.Threading.Tasks;
-using System.Windows;
+using System.Windows;
 
 namespace PageViewer
 {
@@ -14,4 +8,4 @@ namespace PageViewer
     public partial class App : Application
     {
     }
-}
+}

LISTING 4-15 PageViewer/LISTING 4-15 PageViewer/MainWindow.xaml.cs

@@ -1,18 +1,6 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Net;
-using System.Text;
+using System.Net;
 using System.Threading.Tasks;
 using System.Windows;
-using System.Windows.Controls;
-using System.Windows.Data;
-using System.Windows.Documents;
-using System.Windows.Input;
-using System.Windows.Media;
-using System.Windows.Media.Imaging;
-using System.Windows.Navigation;
-using System.Windows.Shapes;
 
 namespace PageViewer
 {
@@ -39,4 +27,4 @@ private async void StartButton_Click(object sender, RoutedEventArgs e)
             ResultTextBlock.Text = webText;
         }
     }
-}
+}

LISTING 4-15 WebClient async/LISTING 4-15 WebClient async/Program.cs

@@ -1,15 +1,19 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
+using System.Net;
 using System.Threading.Tasks;
 
 namespace LISTING_4_15_WebClient_async
 {
     class Program
     {
+        static async Task<string> readWebpage(string uri)
+        {
+            WebClient client = new WebClient();
+            return await client.DownloadStringTaskAsync(uri);
+        }
+
         static void Main(string[] args)
         {
+            readWebpage("http://www.microsoft.com");
         }
     }
-}
+}

LISTING 4-16 HttpClient/LISTING 4-16 HttpClient/App.xaml.cs

@@ -1,18 +1,8 @@
 using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Runtime.InteropServices.WindowsRuntime;
 using Windows.ApplicationModel;
 using Windows.ApplicationModel.Activation;
-using Windows.Foundation;
-using Windows.Foundation.Collections;
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
-using Windows.UI.Xaml.Controls.Primitives;
-using Windows.UI.Xaml.Data;
-using Windows.UI.Xaml.Input;
-using Windows.UI.Xaml.Media;
 using Windows.UI.Xaml.Navigation;
 
 namespace PageViewer
@@ -97,4 +87,4 @@ private void OnSuspending(object sender, SuspendingEventArgs e)
             deferral.Complete();
         }
     }
-}
+}

LISTING 4-16 HttpClient/LISTING 4-16 HttpClient/MainPage.xaml.cs

@@ -1,20 +1,9 @@
 using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
 using System.Net.Http;
-using System.Runtime.InteropServices.WindowsRuntime;
 using System.Threading.Tasks;
-using Windows.Foundation;
-using Windows.Foundation.Collections;
 using Windows.UI.Popups;
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Controls;
-using Windows.UI.Xaml.Controls.Primitives;
-using Windows.UI.Xaml.Data;
-using Windows.UI.Xaml.Input;
-using Windows.UI.Xaml.Media;
-using Windows.UI.Xaml.Navigation;
 
 // The Blank Page item template is documented at https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409
 
@@ -36,7 +25,6 @@ async Task<string> readWebpage(string uri)
             return await client.GetStringAsync(uri);
         }
 
-
         private async void StartButton_Click(object sender, RoutedEventArgs e)
         {
             try
@@ -51,4 +39,4 @@ private async void StartButton_Click(object sender, RoutedEventArgs e)
             }
         }
     }
-}
+}

LISTING 4-17 Asynchronous file writing/LISTING 4-17 Asynchronous file writing/App.xaml.cs

@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Configuration;
-using System.Data;
-using System.Linq;
-using System.Threading.Tasks;
-using System.Windows;
+using System.Windows;
 
 namespace FileWriter
 {
@@ -14,4 +8,4 @@ namespace FileWriter
     public partial class App : Application
     {
     }
-}
+}

LISTING 4-17 Asynchronous file writing/LISTING 4-17 Asynchronous file writing/MainWindow.xaml.cs

@@ -60,4 +60,4 @@ private void TimeButton_Click(object sender, RoutedEventArgs e)
             TimeTextBlock.Text = DateTime.Now.ToLongTimeString();
         }
     }
-}
+}

LISTING 4-18 File exceptions/LISTING 4-18 File exceptions/App.xaml.cs

@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Configuration;
-using System.Data;
-using System.Linq;
-using System.Threading.Tasks;
-using System.Windows;
+using System.Windows;
 
 namespace FileWriter
 {
@@ -14,4 +8,4 @@ namespace FileWriter
     public partial class App : Application
     {
     }
-}
+}

LISTING 4-18 File exceptions/LISTING 4-18 File exceptions/MainWindow.xaml.cs

@@ -60,6 +60,5 @@ private void StartVoidButton_Click(object sender, RoutedEventArgs e)
                 MessageBox.Show(writeException.Message, "File write failed");
             }
         }
-
     }
-}
+}

LISTING 4-19 Read with SQL/LISTING 4-19 Read with SQL/Program.cs

@@ -31,6 +31,5 @@ static void Main(string[] args)
 
             Console.ReadKey();
         }
-
     }
-}
+}

LISTING 4-1 Using a FileStream/LISTING 4-1 Using a FileStream/Program.cs

@@ -25,4 +25,4 @@ static void Main(string[] args)
             Console.ReadKey();
         }
     }
-}
+}

LISTING 4-20 Filter with SQL/LISTING 4-20 Filter with SQL/Program.cs

@@ -31,4 +31,4 @@ static void Main(string[] args)
             Console.ReadKey();
         }
     }
-}
+}

LISTING 4-21 Update with SQL/LISTING 4-21 Update with SQL/Program.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Data.SqlClient;
 
-
 namespace LISTING_4_21_Update_with_SQL
 {
     class Program
@@ -47,4 +46,4 @@ static void Main(string[] args)
             Console.ReadKey();
         }
     }
-}
+}

LISTING 4-22 SQL injection/LISTING 4-22 SQL injection/Program.cs

@@ -53,4 +53,4 @@ static void Main(string[] args)
             Console.ReadKey();
         }
     }
-}
+}

LISTING 4-23 Parameterized query/LISTING 4-23 Parameterized query/Program.cs

@@ -55,4 +55,4 @@ static void Main(string[] args)
             Console.ReadKey();
         }
     }
-}
+}

LISTING 4-24 Asynchronous access/LISTING 4-24 Asynchronous access/App.xaml.cs

@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Configuration;
-using System.Data;
-using System.Linq;
-using System.Threading.Tasks;
-using System.Windows;
+using System.Windows;
 
 namespace MusicTracks
 {
@@ -14,4 +8,4 @@ namespace MusicTracks
     public partial class App : Application
     {
     }
-}
+}

LISTING 4-24 Asynchronous access/LISTING 4-24 Asynchronous access/MainWindow.xaml.cs

@@ -10,7 +10,6 @@ namespace MusicTracks
     /// </summary>
     public partial class MainWindow : Window
     {
-
         // You will need to edit this string to match your database file
         string connectionString = "Server=(localdb)\\mssqllocaldb;" +
             "Database=MusicTracksContext-e0f0cd0d-38fe-44a4-add2-359310ff8b5d;" +
@@ -71,4 +70,4 @@ private async void ViewDatabaseButton_Click(object sender, RoutedEventArgs e)
             }
         }
     }
-}
+}

LISTING 4-25 NASA JSON/LISTING 4-25 NASA JSON/App.xaml.cs

@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Configuration;
-using System.Data;
-using System.Linq;
-using System.Threading.Tasks;
-using System.Windows;
+using System.Windows;
 
 namespace NASAAstronomyPictureOfTheDay
 {
@@ -14,4 +8,4 @@ namespace NASAAstronomyPictureOfTheDay
     public partial class App : Application
     {
     }
-}
+}

LISTING 4-25 NASA JSON/LISTING 4-25 NASA JSON/MainWindow.xaml.cs

@@ -39,19 +39,25 @@ public async Task displayUrl(string url)
         public class ImageOfDay
         {
             public string date { get; set; }
+
             public string explanation { get; set; }
+
             public string hdurl { get; set; }
+
             public string media_type { get; set; }
+
             public string service_version { get; set; }
+
             public string title { get; set; }
+
             public string url { get; set; }
         }
 
         async Task<ImageOfDay> GetImageOfDay(string imageURL)
         {
             string NASAJson = await readWebpage(imageURL);
 
-            ImageOfDay result = JsonConvert.DeserializeObject< ImageOfDay>(NASAJson);
+            ImageOfDay result = JsonConvert.DeserializeObject<ImageOfDay>(NASAJson);
 
             return result;
         }
@@ -78,4 +84,4 @@ private async void LoadButtonClicked(object sender, RoutedEventArgs e)
             }
         }
     }
-}
+}

LISTING 4-26 XML elements/LISTING 4-26 XML elements/Program.cs

@@ -33,4 +33,4 @@ static void Main(string[] args)
             Console.ReadKey();
         }
     }
-}
+}