Sevral bugs ar efixed, like braodcast spamming

BuechermarktClient/Backup.cs

@@ -17,7 +17,7 @@ namespace BuechermarktClient
 
          var ts = (Int32)(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1))).TotalSeconds;
          var process = new Process();
-         process.StartInfo.FileName = "mongodump.exe";
+         process.StartInfo.FileName = ".\\mongodump.exe";
          process.StartInfo.Arguments = "--host " + MainWindow.MongoHost + " --db " + MainWindow.DatabaseName + " --gzip --out .\\backups\\" + ts;
          process.StartInfo.RedirectStandardOutput = true;
          process.StartInfo.UseShellExecute = false;

BuechermarktClient/BookTypes.xaml.cs

@@ -75,7 +75,7 @@ namespace BuechermarktClient
                list = MainWindow.BookTypeCollection.FindSync((b) => true).ToList();
                not = false;
             }
-            catch (Exception e)
+            catch (MongoExecutionTimeoutException)
             {
                Thread.Sleep(200);
             }
@@ -84,13 +84,27 @@ namespace BuechermarktClient
          var show = new List<BookType>();
          if(SearchField != null && SearchField != String.Empty)
          {
-            foreach(var e in list)
+            if (SearchField == "%d%")
+            {
+               foreach (var e in list)
+               {
+                  foreach (var e2 in list)
+                  {
+                     if (e.ID == e2.ID) continue;
+                     if (e.ISBN == e2.ISBN) show.Add(e);
+                  }
+               }
+            }
+            else
+            {
+               foreach (var e in list)
                {
                   if (e.ISBN.ToLower().Contains(SearchField.ToLower()) || e.Name.ToLower().Contains(SearchField.ToLower()))
                   {
                      show.Add(e);
                   }
                }
+            }
          } else {
             show = list;
          }

BuechermarktClient/BookTypesEdit.xaml.cs

@@ -87,7 +87,7 @@ namespace BuechermarktClient
                }
                Close();
                return;
-            } catch (Exception)
+            } catch (MongoExecutionTimeoutException)
             {
                Thread.Sleep(100);
             }
@@ -106,7 +106,7 @@ namespace BuechermarktClient
                }
                Close();
                return;
-            } catch (Exception)
+            } catch (MongoExecutionTimeoutException)
             {
                Thread.Sleep(100);
             }

BuechermarktClient/Books.xaml

@@ -24,7 +24,7 @@
                 <ColumnDefinition Width="Auto"></ColumnDefinition>
             </Grid.ColumnDefinitions>
             <Label Content="Search:" Grid.Column="0"></Label>
-            <TextBox Grid.Column="1" Text="{Binding SearchField, Mode=OneWayToSource}"></TextBox>
+            <TextBox Grid.Column="1" Text="{Binding SearchField, Mode=Default, UpdateSourceTrigger=PropertyChanged}"></TextBox>
             <Button Content="S" Grid.Column="2" Width="25" Click="Search_Click"/>
         </Grid>
         <ListView Grid.Row="1" Margin="0,0,0,0" Name="BooksList">

BuechermarktClient/Books.xaml.cs

@@ -9,6 +9,7 @@ using System.Windows.Data;
 using System.Globalization;
 using MongoDB.Bson;
 using System.Collections.Generic;
+using System.ComponentModel;
 
 namespace BuechermarktClient
 {
@@ -61,12 +62,33 @@ namespace BuechermarktClient
    /// <summary>
    /// Interaktionslogik für Books.xaml
    /// </summary>
-   public partial class Books : Window
+   public partial class Books : Window, INotifyPropertyChanged
    {
       public Thread RefreshThread = null;
       private bool ThreadRunning = true;
 
-      public string SearchField { get; set; }
+      public event PropertyChangedEventHandler PropertyChanged;
+      protected void OnPropertyChanged(string propertyName)
+      {
+         PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+      }
+
+      private string _SearchField;
+      public string SearchField
+      {
+         get
+         {
+            return _SearchField;
+         }
+         set
+         {
+            if (value != _SearchField)
+            {
+               _SearchField = value;
+               OnPropertyChanged("SearchField");
+            }
+         }
+      }
 
       public Books()
       {
@@ -75,6 +97,7 @@ namespace BuechermarktClient
          RefreshThread.Start();
          RefreshThread.IsBackground = true;
          Closing += Book_Closing;
+         DataContext = this;
       }
 
       private void Book_Closing(object sender, System.ComponentModel.CancelEventArgs e)
@@ -102,7 +125,7 @@ namespace BuechermarktClient
             {
                list = MainWindow.BookCollection.FindSync((b) => true).ToList();
                not = false;
-            } catch (Exception e)
+            } catch (MongoExecutionTimeoutException)
             {
                Thread.Sleep(200);
             }
@@ -110,6 +133,19 @@ namespace BuechermarktClient
 
          var show = new List<Models.Book>();
          if (SearchField != null && SearchField != String.Empty)
+         {
+            if (SearchField == "%d%")
+            {
+               foreach (var e in list)
+               {
+                  foreach (var e2 in list)
+                  {
+                     if (e.ID == e2.ID) continue;
+                     if (e.LabelId == e2.LabelId) show.Add(e);
+                  }
+               }
+            }
+            else
             {
                foreach (var e in list)
                {
@@ -119,11 +155,12 @@ namespace BuechermarktClient
                   }
                }
             }
+         }
          else
          {
             if(list.Count > 100)
             {
-               for(int i = 0; i < 150; i++)
+               for(int i = 0; i < 100; i++)
                {
                   show.Add(list[i]);
                }

BuechermarktClient/BooksEdit.xaml.cs

@@ -17,6 +17,10 @@ namespace BuechermarktClient
    {
       public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
       {
+         if((double)value == 0)
+         {
+            return "";
+         }
          return value?.ToString();
       }
 
@@ -25,6 +29,7 @@ namespace BuechermarktClient
          var style = NumberStyles.AllowDecimalPoint;
          var c = CultureInfo.CreateSpecificCulture("de-DE");
          if (value == null) return null;
+         if ((string)value == "") return 0;
          if (!double.TryParse((string)value, style, c, out double outD)) return null;
          return outD;
       }
@@ -62,7 +67,7 @@ namespace BuechermarktClient
                try
                {
                   return MainWindow.StudentCollection.Find(s => s.ID == Book.Student).FirstOrDefault();
-               } catch (Exception)
+               } catch (MongoExecutionTimeoutException)
                {
                   Thread.Sleep(100);
                }
@@ -76,7 +81,7 @@ namespace BuechermarktClient
                OnPropertyChanged("Student");
             } else if(value == null)
             {
-               Book.Student = new MongoDB.Bson.ObjectId(string.Empty);
+               Book.Student = new MongoDB.Bson.ObjectId();
             }
          }
       }
@@ -98,7 +103,8 @@ namespace BuechermarktClient
                   try
                   {
                      Student = MainWindow.StudentCollection.Find(s => s.LabelId.Equals(value)).FirstOrDefault();
-                  } catch (Exception)
+                     f = false;
+                  } catch (MongoExecutionTimeoutException)
                   {
                      Thread.Sleep(100);
                   }
@@ -162,7 +168,7 @@ namespace BuechermarktClient
                try
                {
                   return MainWindow.BookTypeCollection.Find(b => b.ID == Book.BookType).FirstOrDefault();
-               } catch (Exception)
+               } catch (MongoExecutionTimeoutException)
                {
                   Thread.Sleep(100);
                }
@@ -177,7 +183,7 @@ namespace BuechermarktClient
             }
             else if (value == null)
             {
-               Book.BookType = new ObjectId("0");
+               Book.BookType = new ObjectId();
             }
          }
       }
@@ -199,9 +205,10 @@ namespace BuechermarktClient
                   try
                   {
                      BookType = MainWindow.BookTypeCollection.Find(b => b.ISBN == value).FirstOrDefault();
+                     //ToDO Fehler wenn buch nicht vorhanden
                      OnPropertyChanged("BookTypeISBN");
                      return;
-                  } catch (Exception)
+                  } catch (MongoExecutionTimeoutException)
                   {
                      Thread.Sleep(100);
                   }
@@ -249,13 +256,15 @@ namespace BuechermarktClient
                try
                {
                   MainWindow.BookCollection.InsertOne(Book);
-                  var oldStudent = Student;
+                  //var oldStudent = Student;
+                  var oldIsbn = BookTypeISBN;
                   Book = new Book();
-                  Student = oldStudent;
+                  BookTypeISBN = oldIsbn;
+                  //Student = oldStudent;
                   Book.State = BookState.InStock;
                   OnPropertyChanged(string.Empty);
                   return;
-               } catch (Exception)
+               } catch (MongoExecutionTimeoutException)
                {
                   Thread.Sleep(100);
                }
@@ -275,7 +284,7 @@ namespace BuechermarktClient
                      .Set(b => b.LabelId, Book.LabelId));
                   Close();
                   return;
-               } catch (Exception)
+               } catch (MongoExecutionTimeoutException)
                {
                   Thread.Sleep(100);
                }
@@ -291,11 +300,11 @@ namespace BuechermarktClient
             {
                try
                {
-                  MainWindow.StudentCollection.DeleteOne(bt => bt.ID == Student.ID);
+                  MainWindow.StudentCollection.DeleteOne(bt => bt.ID == Book.ID);
                   Close();
                   return;
                }
-               catch (Exception)
+               catch (MongoExecutionTimeoutException)
                {
                   Thread.Sleep(100);
                }

BuechermarktClient/BuechermarktClient.csproj

@@ -86,6 +86,10 @@
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
     </Page>
+    <Page Include="Sell.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
     <Page Include="Students.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:Compile</Generator>
@@ -119,6 +123,9 @@
     <Compile Include="GetConnection.xaml.cs">
       <DependentUpon>GetConnection.xaml</DependentUpon>
     </Compile>
+    <Compile Include="Sell.xaml.cs">
+      <DependentUpon>Sell.xaml</DependentUpon>
+    </Compile>
     <Compile Include="SigningService.cs" />
     <Compile Include="Students.xaml.cs">
       <DependentUpon>Students.xaml</DependentUpon>

BuechermarktClient/MainWindow.xaml

@@ -11,9 +11,11 @@
             <ColumnDefinition Width="Auto"></ColumnDefinition>
             <ColumnDefinition Width="Auto"></ColumnDefinition>
             <ColumnDefinition Width="Auto"></ColumnDefinition>
+            <ColumnDefinition Width="Auto"></ColumnDefinition>
         </Grid.ColumnDefinitions>
         <Button Grid.Column="0" Content="Buchtypen" HorizontalAlignment="Left" Height="75" Margin="10,10,0,0" VerticalAlignment="Top" Width="100" Click="BookTypes_Click"/>
         <Button Grid.Column="1" Content="Schüler" HorizontalAlignment="Left" Height="75" Margin="10,10,0,0" VerticalAlignment="Top" Width="100" Click="Students_Click"/>
         <Button Grid.Column="2" Content="Bücher" HorizontalAlignment="Left" Height="75" Margin="10,10,0,0" VerticalAlignment="Top" Width="100" Click="Books_Click"/>
+        <Button Grid.Column="3" Content="Verkauf" HorizontalAlignment="Left" Height="75" Margin="10,10,0,0" VerticalAlignment="Top" Width="100" Click="Sell_Click"/>
     </Grid>
 </Window>

BuechermarktClient/MainWindow.xaml.cs

@@ -55,6 +55,7 @@ namespace BuechermarktClient
       public BookTypes BookTypesWindow = null;
       public Students StudentsWindow = null;
       public Books BooksWindow = null;
+      public Sell SellWindow = null;
 
       public MainWindow()
       {
@@ -65,22 +66,9 @@ namespace BuechermarktClient
          //ToDo get server informations
       }
 
-      public void ConnectionTester()
-      {
-         Mongo.Cluster.DescriptionChanged += (object sender, ClusterDescriptionChangedEventArgs e) =>
-         {
-
-         };
-      }
-
       public void OnConnectionEstablised()
       {
          Mongo = new MongoClient("mongodb://" + MongoHost + ":27017");
-         //Database = Mongo.GetDatabase(DatabaseName);
-         //BookTypeCollection = 
-         //BookCollection = Database.GetCollection<Book>("books");
-         //StudentCollection = Database.GetCollection<Student>("students");
-
          var t = new Thread(BackupService);
          t.Start();
       }
@@ -180,5 +168,27 @@ namespace BuechermarktClient
       {
          BooksWindow = null;
       }
+
+      private void Sell_Click(object sender, RoutedEventArgs e)
+      {
+         if (SellWindow == null)
+         {
+            SellWindow = new Sell()
+            {
+               Owner = this
+            };
+            SellWindow.Show();
+            SellWindow.Closed += SellWindow_Closes;
+         }
+         else
+         {
+            BringWindowOnTop(SellWindow);
+         }
+      }
+
+      private void SellWindow_Closes(object sender, EventArgs e)
+      {
+         SellWindow = null;
+      }
    }
 }

BuechermarktClient/Sell.xaml

@@ -0,0 +1,62 @@
+<Window x:Class="BuechermarktClient.Sell"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:BuechermarktClient"
+        mc:Ignorable="d"
+        Title="Sell" Height="300" Width="300">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"></RowDefinition>
+            <RowDefinition Height="*"></RowDefinition>
+            <RowDefinition Height="Auto"></RowDefinition>
+            <RowDefinition Height="Auto"></RowDefinition>
+            <RowDefinition Height="Auto"></RowDefinition>
+        </Grid.RowDefinitions>
+        <Grid Grid.Row="0">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="Auto"></ColumnDefinition>
+                <ColumnDefinition Width="*"></ColumnDefinition>
+                <ColumnDefinition Width="Auto"></ColumnDefinition>
+            </Grid.ColumnDefinitions>
+            <Label Content="Hinzufügen:" Grid.Column="0"></Label>
+            <TextBox Grid.Column="1" Text="{Binding AddField, Mode=Default}" ForceCursor="True"></TextBox>
+            <Button Content="A" Grid.Column="2" Width="25" Click="Add_Click"/>
+        </Grid>
+        <ListView Grid.Row="1" Name="BooksList">
+            <ListView.View>
+                <GridView>
+                    <GridViewColumn Header="SID" DisplayMemberBinding="{Binding StudentId}" Width="Auto"></GridViewColumn>
+                    <GridViewColumn Header="BID" DisplayMemberBinding="{Binding LabelId}" Width="Auto"></GridViewColumn>
+                    <GridViewColumn Header="Buchtyp" DisplayMemberBinding="{Binding bookType}" Width="Auto"></GridViewColumn>
+                    <GridViewColumn Header="Preis" DisplayMemberBinding="{Binding Price}" Width="Auto"></GridViewColumn>
+                </GridView>
+            </ListView.View>
+            <ListView.ItemContainerStyle>
+                <Style TargetType="ListViewItem">
+                    <EventSetter Event="PreviewMouseDoubleClick" Handler="ListViewItem_PreviewMouseUp"></EventSetter>
+                </Style>
+            </ListView.ItemContainerStyle>
+        </ListView>
+        <Grid Grid.Row="2">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="*"/>
+                <ColumnDefinition Width="Auto"/>
+            </Grid.ColumnDefinitions>
+            <Label Grid.Column="0" Content="SV: " HorizontalContentAlignment="Right"></Label>
+            <Label Grid.Column="1" Content="{Binding Path=SvSum, Mode=TwoWay}"></Label>
+        </Grid>
+        <Grid Grid.Row="3">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="*"/>
+                <ColumnDefinition Width="Auto"/>
+            </Grid.ColumnDefinitions>
+            <Label Grid.Column="0" Content="Gesamt: " HorizontalContentAlignment="Right"></Label>
+            <Label Grid.Column="1" Content="{Binding Path=TotalSum, Mode=TwoWay}" FontSize="16" FontWeight="Bold"></Label>
+        </Grid>
+        <Button Grid.Row="4" Content="Abschließen" VerticalAlignment="Center" Click="SellAll_Click">
+
+        </Button>
+    </Grid>
+</Window>

BuechermarktClient/Sell.xaml.cs

@@ -0,0 +1,286 @@
+using BuechermarktClient.Models;
+using System.ComponentModel;
+using System.Linq;
+using System.Windows;
+using MongoDB.Driver;
+using MongoDB.Bson;
+using System.Collections.Generic;
+using System.Windows.Data;
+using System;
+using System.Globalization;
+using System.Threading;
+using System.Windows.Input;
+using System.Windows.Controls;
+using System.Collections.Specialized;
+using System.Collections.ObjectModel;
+
+namespace BuechermarktClient
+{
+
+
+   /// <summary>
+   /// Interaktionslogik für Sell.xaml
+   /// </summary>
+   public partial class Sell : Window, INotifyPropertyChanged
+   {
+
+      public event PropertyChangedEventHandler PropertyChanged;
+      protected void OnPropertyChanged(string propertyName)
+      {
+         PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+      }
+
+      private Dictionary<char, char> _Dictionary;
+      private Dictionary<char, char> _ReverseDictionary;
+
+      private string _AddField;
+      public string AddField
+      {
+         get
+         {
+            return _AddField;
+         }
+
+         set
+         {
+            if(value != _AddField)
+            {
+               _AddField = value;
+               OnPropertyChanged("AddField");
+            }
+         }
+      }
+
+      private int _SvSum;
+      public int SvSum
+      {
+         get
+         {
+            return _SvSum;
+         }
+         set
+         {
+            if (value != _SvSum)
+            {
+               _SvSum = value;
+               OnPropertyChanged("SvSum");
+            }
+         }
+      }
+
+      private double _TotalSum;
+      public double TotalSum
+      {
+         get
+         {
+            return _TotalSum;
+         }
+         set
+         {
+            if(value != _TotalSum)
+            {
+               _TotalSum = value;
+               OnPropertyChanged("TotalSum");
+            }
+         }
+      }
+
+      private readonly ObservableCollection<SellBook> _SellBooks;
+
+
+      public ObservableCollection<SellBook> SellBooks { get { return _SellBooks; } }
+
+      private void listChanged(object sender, NotifyCollectionChangedEventArgs args)
+      {
+         SvSum = SellBooks.Count;
+         var pr = 0.0;
+         foreach(var sb in SellBooks)
+         {
+            pr += sb.Price;
+         }
+         TotalSum = SvSum + pr;
+      }
+
+      public Sell()
+      {
+         InitializeComponent();
+         DataContext = this;
+         _SellBooks = new ObservableCollection<SellBook>();
+         _SellBooks.CollectionChanged += listChanged;
+         _Dictionary = new Dictionary<char, char>();
+         _Dictionary.Add('a', 'A');
+         _Dictionary.Add('b', 'B');
+         _Dictionary.Add('c', 'C');
+         _Dictionary.Add('d', 'D');
+         _Dictionary.Add('e', 'E');
+         _Dictionary.Add('f', 'F');
+         _Dictionary.Add('g', 'G');
+         _Dictionary.Add('h', 'H');
+         _Dictionary.Add('i', 'I');
+         _Dictionary.Add('j', 'J');
+         _Dictionary.Add('k', 'K');
+         _Dictionary.Add('l', 'L');
+         _Dictionary.Add('m', 'M');
+         _Dictionary.Add('n', 'N');
+         _Dictionary.Add('o', 'O');
+         _Dictionary.Add('p', 'P');
+         _Dictionary.Add('q', 'Q');
+         _Dictionary.Add('r', 'R');
+         _Dictionary.Add('s', 'S');
+         _Dictionary.Add('t', 'T');
+         _Dictionary.Add('u', 'U');
+         _Dictionary.Add('v', 'V');
+         _Dictionary.Add('w', 'W');
+         _Dictionary.Add('x', 'X');
+         _Dictionary.Add('y', 'Y');
+         _Dictionary.Add('z', 'Z');
+         _Dictionary.Add('1', '!');
+         _Dictionary.Add('2', '"');
+         _Dictionary.Add('3', '§');
+         _Dictionary.Add('4', '$');
+         _Dictionary.Add('5', '%');
+         _Dictionary.Add('6', '&');
+         _Dictionary.Add('7', '/');
+         _Dictionary.Add('8', '(');
+         _Dictionary.Add('9', ')');
+         _Dictionary.Add('0', '=');
+         _Dictionary.Add('ß', '?');
+         _Dictionary.Add('-', '_');
+
+         _ReverseDictionary = new Dictionary<char, char>();
+         foreach(var entry in _Dictionary)
+         {
+            _ReverseDictionary.Add(entry.Value, entry.Key);
+         }
+      }
+
+      private void Add_Click(object sender, RoutedEventArgs e)
+      {
+         while (true)
+         {
+            try
+            {
+               var reverse = ReverseString(AddField);
+               var case1 = ReverseUnderscore(AddField);
+               var case2 = ReverseUnderscore(reverse);
+               foreach (var s in SellBooks)
+               {
+                  if(s.LabelId == AddField || s.LabelId == reverse || s.LabelId == case1 ||s.LabelId == case2)
+                  {
+                     MessageBox.Show("Das Buch ist bereits in der Liste");
+                     return;
+                  }
+               }
+
+               var item = MainWindow.BookCollection.FindSync<Models.Book>(b => b.LabelId == AddField || b.LabelId == reverse || b.LabelId == case1 || b.LabelId == case2).FirstOrDefault();
+               if (item == null)
+               {
+                  MessageBox.Show("Das Buch ist nicht vorhanden bitte überprüfen");
+                  return;
+               }
+
+               var stud = MainWindow.StudentCollection.FindSync<Models.Student>(s => s.ID == item.Student).FirstOrDefault();
+               if (stud == null)
+               {
+                  MessageBox.Show("Der Schüler ist nicht vorhanden bitte überprüfen");
+                  return;
+               }
+
+               var type = MainWindow.BookTypeCollection.FindSync<Models.BookType>(bt => bt.ID == item.BookType).FirstOrDefault();
+               if (type == null)
+               {
+                  MessageBox.Show("Der Buchtyp (ObjId: " + item.BookType + ") ist nicht vorhanden bitte überprüfen");
+                  return;
+               }
+
+               var sb = new SellBook();
+               sb.StudentId = stud.LabelId;
+               sb.LabelId = item.LabelId;
+               sb.Price = item.Price;
+               sb.Type = type.Name;
+
+               AddField = String.Empty;
+
+               SellBooks.Add(sb);
+               Dispatcher.BeginInvoke(new Action(delegate () {
+                  BooksList.ItemsSource = SellBooks;
+               }));
+               return;
+            } catch (MongoExecutionTimeoutException)
+            {
+               Thread.Sleep(100);
+            }
+         }
+      }
+
+      private void ListViewItem_PreviewMouseUp(object sender, MouseButtonEventArgs e)
+      {
+         if (sender is ListViewItem item && item.IsSelected)
+         {
+            SellBooks.Remove(item.DataContext as SellBook);
+            Dispatcher.BeginInvoke(new Action(delegate () {
+               BooksList.ItemsSource = SellBooks;
+            }));
+         }
+      }
+
+      private void SellAll_Click(object sender, RoutedEventArgs e)
+      {
+         while (true)
+         {
+            try
+            {
+               foreach (var sb in SellBooks)
+               {
+                  MainWindow.BookCollection.FindOneAndUpdate<Models.Book>(b => b.LabelId == sb.LabelId, Builders<Book>.Update.Set(b => b.State, Models.BookState.Selled));
+               }
+               SellBooks.Clear();
+               Dispatcher.BeginInvoke(new Action(delegate () {
+                  BooksList.ItemsSource = SellBooks;
+               }));
+               return;
+            } catch (MongoExecutionTimeoutException)
+            {
+               Thread.Sleep(100);
+            }
+         }
+      }
+
+      private string ReverseString(string s)
+      {
+         var res = String.Empty;
+         foreach(var i in s)
+         {
+            char v;
+            if(_Dictionary.TryGetValue(i, out v) || _ReverseDictionary.TryGetValue(i, out v))
+            {
+               res += v;
+            } else {
+               MessageBox.Show(string.Format("Das Label enthält ungültige Zeichen ( {0} ), {1}", i, s));
+               return null;
+            }
+         }
+         return res;
+      }
+
+      private string ReverseUnderscore(string s)
+      {
+         if(s.IndexOf("_") >= 0 || s.IndexOf("-") >= 0)
+         {
+            s = s.Replace("_", "?").Replace("-", "ß");
+         } else
+         {
+            s = s.Replace("?", "_").Replace("ß", "-");
+         }
+         return s;
+      }
+   }
+
+   public class SellBook
+   {
+      public string StudentId { get; set; }
+      public string LabelId { get; set; }
+      public string Type { get; set; }
+      public double Price { get; set; }
+   }
+}

BuechermarktClient/Students.xaml.cs

@@ -79,7 +79,7 @@ namespace BuechermarktClient
                list = MainWindow.StudentCollection.FindSync((b) => true).ToList();
                not = false;
             }
-            catch (Exception e)
+            catch (MongoExecutionTimeoutException)
             {
                Thread.Sleep(200);
             }
@@ -87,15 +87,28 @@ namespace BuechermarktClient
 
          var show = new List<Student>();
          if (SearchField != null && SearchField != String.Empty)
+         {
+            if(SearchField == "%d%")
             {
                foreach (var e in list)
                {
-               if (e.Forname.ToLower().Contains(SearchField.ToLower()) || e.Lastname.ToLower().Contains(SearchField.ToLower()) || e.PhoneNumber.ToLower().Contains(SearchField.ToLower()) || e.EMail.ToLower().Contains(SearchField.ToLower()) || e.Form.ToLower().Contains(SearchField.ToLower()))
+                  foreach (var e2 in list)
+                  {
+                     if (e.ID == e2.ID) continue;
+                     if (e.LabelId == e2.LabelId) show.Add(e);
+                  }
+               }
+            } else {
+               foreach (var e in list)
+               {
+                  //
+                  if (e.Forname.ToLower().Contains(SearchField.ToLower()) || e.Lastname.ToLower().Contains(SearchField.ToLower()) || e.EMail.ToLower().Contains(SearchField.ToLower()) || e.Form.ToLower().Contains(SearchField.ToLower()) || e.LabelId.ToLower().Contains(SearchField.ToLower()))
                   {
                      show.Add(e);
                   }
                }
             }
+         }
          else
          {
             show = list;

BuechermarktClient/StudentsEdit.xaml.cs

@@ -157,9 +157,9 @@ namespace BuechermarktClient
                      .Set(s => s.Form, Student.Form));
 
                   Close();
-                  return;
                }
-            } catch (Exception)
+               return;
+            } catch (MongoExecutionTimeoutException)
             {
                Thread.Sleep(100);
             }
@@ -177,8 +177,9 @@ namespace BuechermarktClient
                   MainWindow.StudentCollection.DeleteOne(bt => bt.ID == Student.ID);
                }
                Close();
+               return;
             }
-            catch (Exception)
+            catch (MongoExecutionTimeoutException)
             {
                Thread.Sleep(100);
             }