From 54ce4e6ee17e570001bbd93a7326b028a89f33b5 Mon Sep 17 00:00:00 2001
From: stubbfel <stubbe@iit.tu-cottbus.de>
Date: Tue, 3 Sep 2013 14:04:29 +0200
Subject: [PATCH] add pdflaunch

---
 CampusAppWP8/CampusAppWP8/CampusAppWP8.csproj |  2 +
 .../CampusAppWP8/File/Exams/ExamFile.cs       | 94 +++++++++++++++++++
 .../CampusAppWP8/Model/BinaryModel.cs         | 62 ++++++++++++
 .../CampusAppWP8/Model/Exams/ExamModel.cs     |  2 +-
 CampusAppWP8/CampusAppWP8/Model/MainModel.cs  | 29 ++----
 CampusAppWP8/CampusAppWP8/Model/XmlModel.cs   |  2 +-
 .../CampusAppWP8/Pages/Exams/Exams.xaml       | 21 ++---
 .../CampusAppWP8/Pages/Exams/Exams.xaml.cs    | 94 +++++++++++++++----
 .../Resources/Constants.Designer.cs           |  9 ++
 .../CampusAppWP8/Resources/Constants.resx     |  3 +
 CampusAppWP8/CampusAppWP8/Utility/File.cs     | 41 ++++----
 .../CampusAppWP8/Utility/HttpRequest.cs       |  4 +
 12 files changed, 286 insertions(+), 77 deletions(-)
 create mode 100644 CampusAppWP8/CampusAppWP8/File/Exams/ExamFile.cs
 create mode 100644 CampusAppWP8/CampusAppWP8/Model/BinaryModel.cs

diff --git a/CampusAppWP8/CampusAppWP8/CampusAppWP8.csproj b/CampusAppWP8/CampusAppWP8/CampusAppWP8.csproj
index 78353d3f..8c591a6c 100644
--- a/CampusAppWP8/CampusAppWP8/CampusAppWP8.csproj
+++ b/CampusAppWP8/CampusAppWP8/CampusAppWP8.csproj
@@ -105,6 +105,8 @@
     <Compile Include="Feed\Mensa\MensaFeedCBSouth.cs" />
     <Compile Include="Feed\Mensa\MensaFeedCBNorth.cs" />
     <Compile Include="Feed\Mensa\MensaFeedCBMain.cs" />
+    <Compile Include="File\Exams\ExamFile.cs" />
+    <Compile Include="Model\BinaryModel.cs" />
     <Compile Include="Model\Campusmap\CBMainMapModel.cs" />
     <Compile Include="Model\Campusmap\CurrentPositionPinModel.cs" />
     <Compile Include="Model\Campusmap\HiddenPinPlaceModel.cs" />
diff --git a/CampusAppWP8/CampusAppWP8/File/Exams/ExamFile.cs b/CampusAppWP8/CampusAppWP8/File/Exams/ExamFile.cs
new file mode 100644
index 00000000..bbd8ceb4
--- /dev/null
+++ b/CampusAppWP8/CampusAppWP8/File/Exams/ExamFile.cs
@@ -0,0 +1,94 @@
+//-----------------------------------------------------------------------
+// <copyright file="ExamFile.cs" company="BTU/IIT">
+//     Company copyright tag.
+// </copyright>
+// <author>stubbfel</author>
+// <sience>03.09.2013</sience>
+//----------------------------------------------------------------------
+
+namespace CampusAppWP8.File.Exams
+{
+    using System.IO;
+    using CampusAppWP8.Model;
+    using Windows.Storage;
+
+    /// <summary>Exam file.</summary>
+    /// <remarks>Stubbfel, 03.09.2013.</remarks>
+    public class ExamFile : BinaryModel
+    {
+        /// <summary>The storage file.</summary>
+        private StorageFile storageFile;
+
+        /// <summary>Initializes a new instance of the ExamFile class.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <param name="fileName">Filename of the file.</param>
+        /// <param name="url">     URL of the document.</param>
+        public ExamFile(string fileName, string url)
+            : base(ModelType.FileAndFeed, fileName, url)
+        {
+            this.IsFileUpToDateOnLoad += new IsFileUpToDate(this.CheckIsFileUpToDate);
+            this.IsModelUpToDateOnLoad += new IsModelUpToDate(this.CheckIsModelUpToDate);
+            this.IsFileUpToDateOnSave += new IsFileUpToDate(this.CheckIsFileUpToDate);
+        }
+
+        /// <summary>Executes the file operation.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        public async void LaunchFile()
+        {
+            if (this.storageFile == null)
+            {
+                this.storageFile = await this.file.AsStorageFile();
+            }
+
+            if (this.storageFile != null)
+            {
+                var options = new Windows.System.LauncherOptions();
+                Windows.System.Launcher.LaunchFileAsync(this.storageFile);
+            }
+        }
+
+        /// <summary>Saves the and launch file.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        public void SaveAndLaunchFile()
+        {
+            if (this.file.Exist())
+            {
+                this.LaunchFile();
+            }
+            else
+            {
+                this.OnSaved += new ExamFile.OnIO(this.LaunchFile);
+                this.SaveData();
+            }
+        }
+
+        /// <summary>Check is model up to date.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <param name="model">The model.</param>
+        /// <returns>true if it succeeds, false if it fails.</returns>
+        private bool CheckIsModelUpToDate(byte[] model)
+        {
+            if (model == null)
+            {
+                return false;
+            }
+
+            return true;
+        }
+
+        /// <summary>Check is file up to date.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <param name="model">   The model.</param>
+        /// <param name="fileInfo">Information describing the file.</param>
+        /// <returns>true if it succeeds, false if it fails.</returns>
+        private bool CheckIsFileUpToDate(byte[] model, FileInfo fileInfo)
+        {
+            if (fileInfo == null || !fileInfo.Exists || fileInfo.Length < 1)
+            {
+                return false;
+            }
+
+            return true;
+        }
+    }
+}
diff --git a/CampusAppWP8/CampusAppWP8/Model/BinaryModel.cs b/CampusAppWP8/CampusAppWP8/Model/BinaryModel.cs
new file mode 100644
index 00000000..6cf9fe7b
--- /dev/null
+++ b/CampusAppWP8/CampusAppWP8/Model/BinaryModel.cs
@@ -0,0 +1,62 @@
+//-----------------------------------------------------------------------
+// <copyright file="BinaryModel.cs" company="BTU/IIT">
+//     Company copyright tag.
+// </copyright>
+// <author>stubbfel</author>
+// <sience>03.09.2013</sience>
+//----------------------------------------------------------------------
+
+namespace CampusAppWP8.Model
+{
+    /// <summary>Binary model.</summary>
+    /// <remarks>Stubbfel, 03.09.2013.</remarks>
+    public abstract class BinaryModel : MainModel<byte[]>
+    {
+        /// <summary>Initializes a new instance of the BinaryModel class.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <param name="modelType">Type of the model.</param>
+        /// <param name="fileName"> Filename of the file.</param>
+        /// <param name="url">      URL of the document.</param>
+        public BinaryModel(ModelType modelType, string fileName, string url)
+            : base(modelType, fileName, url)
+        {
+        }
+
+        /// <summary>Initializes a new instance of the BinaryModel class.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <param name="modelType"> Type of the model.</param>
+        /// <param name="sourceName">Name of the source.</param>
+        public BinaryModel(ModelType modelType, string sourceName)
+            : base(modelType, sourceName)
+        {
+        }
+
+        /// <summary>Deserialize model.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <param name="modelData">Information describing the model.</param>
+        /// <returns>true if it succeeds, false if it fails.</returns>
+        protected override bool DeserializeModel(byte[] modelData)
+        {
+            bool retValue = true;
+
+            if (modelData != null)
+            {
+                this.Model = modelData;
+            }
+            else
+            {
+                retValue = false;
+            }
+
+            return retValue;
+        }
+
+        /// <summary>Gets the serialize model.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <returns>an byte Array.</returns>
+        protected override byte[] SerializeModel()
+        {
+            return this.Model;
+        }
+    }
+}
diff --git a/CampusAppWP8/CampusAppWP8/Model/Exams/ExamModel.cs b/CampusAppWP8/CampusAppWP8/Model/Exams/ExamModel.cs
index 5b68c879..57752d26 100644
--- a/CampusAppWP8/CampusAppWP8/Model/Exams/ExamModel.cs
+++ b/CampusAppWP8/CampusAppWP8/Model/Exams/ExamModel.cs
@@ -7,8 +7,8 @@
 //----------------------------------------------------------------------
 namespace CampusAppWP8.Model.Exams
 {
-    using CampusAppWP8.Utility;
     using System.Xml.Serialization;
+    using CampusAppWP8.Utility;
 
     /// <summary>Exam model.</summary>
     /// <remarks>Stubbfel, 02.09.2013.</remarks>
diff --git a/CampusAppWP8/CampusAppWP8/Model/MainModel.cs b/CampusAppWP8/CampusAppWP8/Model/MainModel.cs
index a88d6a99..6a01db2b 100644
--- a/CampusAppWP8/CampusAppWP8/Model/MainModel.cs
+++ b/CampusAppWP8/CampusAppWP8/Model/MainModel.cs
@@ -11,7 +11,6 @@ namespace CampusAppWP8
     using System.Collections.Generic;
     using System.IO;
     using System.Net;
-    using System.Text;
     using CampusAppWP8.Model.Utility;
     using CampusAppWP8.Utility;
     
@@ -19,8 +18,13 @@ namespace CampusAppWP8
     /// Base model io handling class.
     /// </summary>
     /// <typeparam name="T">model type</typeparam>
-    public abstract class MainModel<T> : IDisposable
+    public abstract class MainModel<T>
     {
+        /// <summary>
+        /// File object.
+        /// </summary>
+        protected CampusAppWP8.Utility.File file = null;
+
         /// <summary>
         /// Model io type.
         /// </summary>
@@ -31,11 +35,6 @@ namespace CampusAppWP8
         /// </summary>
         private T model = default(T);
 
-        /// <summary>
-        /// File object.
-        /// </summary>
-        private CampusAppWP8.Utility.File file = null;
-
         /// <summary>
         /// Web object.
         /// </summary>
@@ -88,14 +87,6 @@ namespace CampusAppWP8
             }
         }
 
-        /// <summary>
-        /// Finalizes an instance of the <see cref="MainModel{T}" /> class.
-        /// </summary>
-        ~MainModel()
-        {
-            this.SaveData();
-        }
-
         /// <summary>
         /// Delegate of the OnIO callback function.
         /// </summary>
@@ -238,14 +229,6 @@ namespace CampusAppWP8
             }
         }
 
-        /// <summary>
-        /// Called before finalizing. Can maybe be removed.
-        /// </summary>
-        public void Dispose()
-        {
-            this.SaveData();
-        }
-
         /// <summary>
         /// Forces a update from web.
         /// </summary>
diff --git a/CampusAppWP8/CampusAppWP8/Model/XmlModel.cs b/CampusAppWP8/CampusAppWP8/Model/XmlModel.cs
index e606f082..5a2cbdbe 100644
--- a/CampusAppWP8/CampusAppWP8/Model/XmlModel.cs
+++ b/CampusAppWP8/CampusAppWP8/Model/XmlModel.cs
@@ -15,7 +15,7 @@ namespace CampusAppWP8.Model
     /// Xml model io handler class.
     /// </summary>
     /// <typeparam name="T">model type</typeparam>
-    public class XmlModel<T> : MainModel<T>
+    public abstract class XmlModel<T> : MainModel<T>
     {
         /// <summary>
         /// Initializes a new instance of the <see cref="XmlModel{T}" /> class.
diff --git a/CampusAppWP8/CampusAppWP8/Pages/Exams/Exams.xaml b/CampusAppWP8/CampusAppWP8/Pages/Exams/Exams.xaml
index d8774e03..c4a7d7cd 100644
--- a/CampusAppWP8/CampusAppWP8/Pages/Exams/Exams.xaml
+++ b/CampusAppWP8/CampusAppWP8/Pages/Exams/Exams.xaml
@@ -29,12 +29,9 @@
                     <ListBox.ItemTemplate>
                         <DataTemplate>
                             <StackPanel>
-                                <lui:ToggleButton ToggleContentTag="{Binding Path=Constants.ToggleContent, Source={StaticResource Const}}" Style="{StaticResource ListButtonStyle}">
+                                <Button Tag="{Binding Link}" Style="{StaticResource ListButtonStyle}" Click="Button_Click">
                                     <TextBlock Text="{Binding Caption}" TextWrapping="Wrap"/>
-                                </lui:ToggleButton>
-                                <StackPanel Tag="{Binding Path=Constants.ToggleContent, Source={StaticResource Const}}" Orientation="Horizontal" HorizontalAlignment="Center" Visibility="Collapsed">
-                                    <lui:LinkButton Height="75" Url="{Binding Link}" />
-                                </StackPanel>
+                                </Button>
                             </StackPanel>
                         </DataTemplate>
                     </ListBox.ItemTemplate>
@@ -51,12 +48,9 @@
                     <ListBox.ItemTemplate>
                         <DataTemplate>
                             <StackPanel>
-                                <lui:ToggleButton ToggleContentTag="{Binding Path=Constants.ToggleContent, Source={StaticResource Const}}" Style="{StaticResource ListButtonStyle}">
+                                <Button Tag="{Binding Link}" Style="{StaticResource ListButtonStyle}" Click="Button_Click">
                                     <TextBlock Text="{Binding Caption}" TextWrapping="Wrap"/>
-                                </lui:ToggleButton>
-                                <StackPanel Tag="{Binding Path=Constants.ToggleContent, Source={StaticResource Const}}" Orientation="Horizontal" HorizontalAlignment="Center" Visibility="Collapsed">
-                                    <lui:LinkButton Height="75" Url="{Binding Link}" />
-                                </StackPanel>
+                                </Button>
                             </StackPanel>
                         </DataTemplate>
                     </ListBox.ItemTemplate>
@@ -73,12 +67,9 @@
                     <ListBox.ItemTemplate>
                         <DataTemplate>
                             <StackPanel>
-                                <lui:ToggleButton ToggleContentTag="{Binding Path=Constants.ToggleContent, Source={StaticResource Const}}" Style="{StaticResource ListButtonStyle}">
+                                <Button Tag="{Binding Link}" Style="{StaticResource ListButtonStyle}" Click="Button_Click">
                                     <TextBlock Text="{Binding Caption}" TextWrapping="Wrap"/>
-                                </lui:ToggleButton>
-                                <StackPanel Tag="{Binding Path=Constants.ToggleContent, Source={StaticResource Const}}" Orientation="Horizontal" HorizontalAlignment="Center" Visibility="Collapsed">
-                                    <lui:LinkButton Height="75" Url="{Binding Link}" />
-                                </StackPanel>
+                                </Button>
                             </StackPanel>
                         </DataTemplate>
                     </ListBox.ItemTemplate>
diff --git a/CampusAppWP8/CampusAppWP8/Pages/Exams/Exams.xaml.cs b/CampusAppWP8/CampusAppWP8/Pages/Exams/Exams.xaml.cs
index 78c5c024..6bcaebe2 100644
--- a/CampusAppWP8/CampusAppWP8/Pages/Exams/Exams.xaml.cs
+++ b/CampusAppWP8/CampusAppWP8/Pages/Exams/Exams.xaml.cs
@@ -8,22 +8,25 @@ namespace CampusAppWP8.Pages.Exams
 {
     using System.Linq;
     using System.Windows;
+    using System.Windows.Controls;
     using System.Windows.Navigation;
     using CampusAppWP8.Feed.Exams;
+    using CampusAppWP8.File.Exams;
     using CampusAppWP8.Resources;
     using CampusAppWP8.Utility;
     using CampusAppWP8.Utility.Lui.MessageBoxes;
     using Microsoft.Phone.Controls;
-    using System.Net;
-    using System.IO;
 
-    /// <summary>Exams.</summary>
+    /// <summary>class of ExamsPage.</summary>
     /// <remarks>Stubbfel, 02.09.2013.</remarks>
     public partial class Exams : PhoneApplicationPage
     {
         /// <summary>The feed.</summary>
         private ExamFeed feed;
 
+        /// <summary>The exam file.</summary>
+        private ExamFile file;
+
         /// <summary>Initializes a new instance of the Exams class.</summary>
         /// <remarks>Stubbfel, 02.09.2013.</remarks>
         public Exams()
@@ -56,8 +59,13 @@ namespace CampusAppWP8.Pages.Exams
         {
             if (NavigationMode.Back == e.NavigationMode)
             {
+                App.SaveToIsolatedStorage<int>(Constants.ExamPageModelKey, -1);
                 this.feed.SaveData();
             }
+            else
+            {
+                App.SaveToIsolatedStorage<int>(Constants.ExamPageModelKey, this.ExamPivot.SelectedIndex);
+            }
         }
 
         /// <summary>Method initialize the Feed.</summary>
@@ -76,7 +84,14 @@ namespace CampusAppWP8.Pages.Exams
         {
             this.SetupExamList();
             this.ProgressBar.Visibility = System.Windows.Visibility.Collapsed;
-            HttpRequest api = new HttpRequest();
+        }
+
+        /// <summary>Executes the PDF reader operation.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        private void LaunchPDFReader()
+        {
+            this.ProgressBar.Visibility = System.Windows.Visibility.Collapsed;
+            this.file.SaveAndLaunchFile();
         }
 
         /// <summary>Sets up the exam list.</summary>
@@ -109,24 +124,28 @@ namespace CampusAppWP8.Pages.Exams
         /// <returns>The calculated selected index.</returns>
         private int CalcSelectedIndex()
         {
-            int result = 0;
-            Model.Setting.UserProfilModel.DegreeType degree = Settings.UserProfil.Degree;
-
-            switch (degree)
+            int result = App.LoadFromIsolatedStorage<int>(Constants.ExamPageModelKey);
+            if (result < 0 || result > 2)
             {
-                case Model.Setting.UserProfilModel.DegreeType.BACHELOR:
-                    result = 0;
-                    break;
-                case Model.Setting.UserProfilModel.DegreeType.MASTER:
-                    result = 1;
-                    break;
-                case Model.Setting.UserProfilModel.DegreeType.DIPLOM:
-                    result = 2;
-                    break;
-                default:
-                    result = 0;
-                    break;
+                Model.Setting.UserProfilModel.DegreeType degree = Settings.UserProfil.Degree;
+
+                switch (degree)
+                {
+                    case Model.Setting.UserProfilModel.DegreeType.BACHELOR:
+                        result = 0;
+                        break;
+                    case Model.Setting.UserProfilModel.DegreeType.MASTER:
+                        result = 1;
+                        break;
+                    case Model.Setting.UserProfilModel.DegreeType.DIPLOM:
+                        result = 2;
+                        break;
+                    default:
+                        result = 0;
+                        break;
+                }
             }
+            
             return result;
         }
 
@@ -145,5 +164,40 @@ namespace CampusAppWP8.Pages.Exams
             MessageBoxResult result = MessageBoxes.ShowMainModelErrorMessageBox(AppResources.MsgBox_ErrorMainModelLoadFile);
             this.ProgressBar.Visibility = System.Windows.Visibility.Collapsed;
         }
+
+        /// <summary>Event handler. Called by Button for click events.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <param name="sender">Source of the event.</param>
+        /// <param name="e">     Routed event information.</param>
+        private void Button_Click(object sender, RoutedEventArgs e)
+        {
+            Button button = sender as Button;
+            if (button == null)
+            {
+                return;
+            }
+
+            string url = button.Tag as string;
+            if (url == null)
+            {
+                return;
+            }
+
+            // create filename
+            string[] filenames = url.Split('/');
+            string filename = url;
+
+            if (filenames.Length > 0)
+            {
+                filename = filenames[filenames.Length - 1];
+            }
+
+            this.file = new ExamFile(filename, url);
+            this.file.OnLoaded += new ExamFile.OnIO(this.LaunchPDFReader);
+            this.file.OnFailedWeb += new ExamFile.OnFailed(this.FeedIsFailWeb);
+            this.file.OnFailedFile += new ExamFile.OnFailed(this.FeedIsFailFile);
+            this.file.LoadData();
+            this.ProgressBar.Visibility = System.Windows.Visibility.Visible;
+        }
     }
 }
\ No newline at end of file
diff --git a/CampusAppWP8/CampusAppWP8/Resources/Constants.Designer.cs b/CampusAppWP8/CampusAppWP8/Resources/Constants.Designer.cs
index bc4f1e44..ca04fe9e 100644
--- a/CampusAppWP8/CampusAppWP8/Resources/Constants.Designer.cs
+++ b/CampusAppWP8/CampusAppWP8/Resources/Constants.Designer.cs
@@ -132,6 +132,15 @@ namespace CampusAppWP8.Resources {
             }
         }
         
+        /// <summary>
+        ///   Sucht eine lokalisierte Zeichenfolge, die ExamsPage.LastPivotIndex ähnelt.
+        /// </summary>
+        public static string ExamPageModelKey {
+            get {
+                return ResourceManager.GetString("ExamPageModelKey", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Sucht eine lokalisierte Zeichenfolge, die links ähnelt.
         /// </summary>
diff --git a/CampusAppWP8/CampusAppWP8/Resources/Constants.resx b/CampusAppWP8/CampusAppWP8/Resources/Constants.resx
index cedfe545..827f5f98 100644
--- a/CampusAppWP8/CampusAppWP8/Resources/Constants.resx
+++ b/CampusAppWP8/CampusAppWP8/Resources/Constants.resx
@@ -447,4 +447,7 @@
   <data name="UrlExamApp_ExamFeed" xml:space="preserve">
     <value>https://www.zv.tu-cottbus.de/CMS-Webservice/Pruefungsordnung/Uebersicht</value>
   </data>
+  <data name="ExamPageModelKey" xml:space="preserve">
+    <value>ExamsPage.LastPivotIndex</value>
+  </data>
 </root>
\ No newline at end of file
diff --git a/CampusAppWP8/CampusAppWP8/Utility/File.cs b/CampusAppWP8/CampusAppWP8/Utility/File.cs
index 61c6e1a1..3a444a0d 100644
--- a/CampusAppWP8/CampusAppWP8/Utility/File.cs
+++ b/CampusAppWP8/CampusAppWP8/Utility/File.cs
@@ -10,6 +10,7 @@ namespace CampusAppWP8.Utility
     using System;
     using System.IO;
     using System.Threading;
+    using System.Threading.Tasks;
     using Windows.Storage;
 
     /// <summary>
@@ -27,12 +28,9 @@ namespace CampusAppWP8.Utility
         /// </summary>
         private string filename = string.Empty;
 
-        /// <summary>
-        /// Initializes a new instance of the <see cref="File" /> class.
-        /// </summary>
-        /// <param name="filename">file name</param>
-        /// <param name="read">read type</param>
-        /// <param name="write">write type</param>
+        /// <summary>Initializes a new instance of the <see cref="File" /> class.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <param name="filename"> file name.</param>
         public File(string filename)
         {
             this.filename = filename;
@@ -43,11 +41,9 @@ namespace CampusAppWP8.Utility
         /// </summary>
         public delegate void WriteCallbackFunc();
 
-        /// <summary>
-        /// Read data from file to a string.
-        /// </summary>
-        /// <param name="ioType">read type</param>
-        /// <returns>data string</returns>
+        /// <summary>Read data from file to a string.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <returns>data string.</returns>
         public byte[] ReadFile()
         {
             byte[] retValue = null;
@@ -60,13 +56,11 @@ namespace CampusAppWP8.Utility
             return retValue;
         }
 
-        /// <summary>
-        /// Write bytes to the file.
-        /// </summary>
-        /// <param name="data">data byte array.</param>
-        /// <param name="onSavedCallback">callback function, called after writing is done.</param>
+        /// <summary>Write bytes to the file.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <param name="data">            data byte array.</param>
+        /// <param name="onSavedCallback"> callback function, called after writing is done.</param>
         /// <param name="onFailedCallback">callback function, called when writing failed.</param>
-        /// <param name="ioType">write type.</param>
         public void WriteFile(byte[] data, WriteCallbackFunc onSavedCallback, WriteCallbackFunc onFailedCallback)
         {
             Thread th = new Thread(delegate() { this.WriteAsync(data, onSavedCallback, onFailedCallback); });
@@ -92,6 +86,19 @@ namespace CampusAppWP8.Utility
             return this.GetFileInfo().Exists;
         }
 
+        /// <summary>Converts this object to a storage file.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <returns>Storage File</returns>
+        public async Task<StorageFile> AsStorageFile()
+        {
+            if (this.Exist())
+            {
+                return await File.LocalFolder.GetFileAsync(this.filename);
+            }
+
+            return null;
+        }
+
         /// <summary>
         /// Read data synchronous from file.
         /// </summary>
diff --git a/CampusAppWP8/CampusAppWP8/Utility/HttpRequest.cs b/CampusAppWP8/CampusAppWP8/Utility/HttpRequest.cs
index 87ce11dc..e8cd4db7 100644
--- a/CampusAppWP8/CampusAppWP8/Utility/HttpRequest.cs
+++ b/CampusAppWP8/CampusAppWP8/Utility/HttpRequest.cs
@@ -60,6 +60,10 @@ namespace CampusAppWP8.Utility
             client.DownloadStringAsync(url);
         }
 
+        /// <summary>Method realize the http-get-method resource.</summary>
+        /// <remarks>Stubbfel, 03.09.2013.</remarks>
+        /// <param name="url">   Url of the resource.</param>
+        /// <param name="action">The action.</param>
         public void HttpGet(Uri url, Action<object, OpenReadCompletedEventArgs> action)
         {
             WebClient client = new WebClient();