Projektdateien hinzufügen.

App.xaml

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+<Application x:Class="WährungsrechnerOOC.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:WährungsrechnerOOC"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

App.xaml.cs

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+using System.Configuration;
+using System.Data;
+using System.Windows;
+
+namespace WährungsrechnerOOC
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+
+}

AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None,            //where theme specific resource dictionaries are located
+                                                //(used if a resource is not found in the page,
+                                                // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly   //where the generic resource dictionary is located
+                                                //(used if a resource is not found in the page,
+                                                // app, or any theme specific resource dictionaries)
+)]

MainWindow.xaml

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+<Window x:Class="EuroToDollarConverter.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="Euro-Umrechner" Height="300" Width="400">
+    <Grid VerticalAlignment="Center">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
+        </Grid.RowDefinitions>
+        <TextBox Name="euroBox" Width="300" Height="40" Margin="10" FontSize="16" Grid.Row="0"
+                 VerticalContentAlignment="Center" HorizontalContentAlignment="Center" />
+        <ComboBox Name="currencyBox" Width="300" Height="40" Margin="10" FontSize="16" Grid.Row="1" VerticalAlignment="Center" HorizontalAlignment="Center"
+                  HorizontalContentAlignment="Center" VerticalContentAlignment="Center">
+            <ComboBoxItem Content="Dollar $"/>
+            <ComboBoxItem Content="Pfund £" />
+            <ComboBoxItem Content="Yen ¥"/>
+            <ComboBoxItem Content="Lira ₺"/>
+            <ComboBoxItem Content="Dirham د. إ "/>
+        </ComboBox>
+        <Button Content="Umrechnen" Width="300" Height="40" Margin="10" FontSize="16" Grid.Row="2" Click="Convert_Click"/>
+        <TextBox Name="dollarBox" Width="300" Height="40" Margin="10" FontSize="16" Grid.Row="3" IsReadOnly="True"
+                 VerticalContentAlignment="Center" HorizontalContentAlignment="Center"/>
+    </Grid>
+</Window>

MainWindow.xaml.cs

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+using System;
+
+using System.Windows;
+
+using System.Windows.Controls;
+
+namespace EuroToDollarConverter
+
+{
+
+    public partial class MainWindow : Window
+
+    {
+
+        public MainWindow()
+
+        {
+
+            InitializeComponent();
+
+        }
+
+        private void Convert_Click(object sender, RoutedEventArgs e)
+
+        {
+
+            string eingabe = euroBox.Text;
+
+            bool Nummer = true;
+
+            foreach (char c in eingabe)
+
+            {
+
+                
+
+                if ((c < '0' || c > '9') && c != ',')
+
+                {
+
+                    Nummer = false;
+
+                    break;
+
+                }
+
+            }
+
+            if (!Nummer)
+
+            {
+
+                MessageBox.Show("Nur Ziffern und maximal ein Komma erlaubt!");
+
+                return;
+
+            }
+
+            double euro = Convert.ToDouble(eingabe);
+
+            double rate = 1;
+
+            ComboBoxItem Item = currencyBox.SelectedItem as ComboBoxItem;
+
+            if (Item == null)
+
+            {
+
+                MessageBox.Show("Bitte wählen Sie eine Währung aus.");
+
+                return;
+
+            }
+
+            string Währung = Item.Content.ToString();
+
+            switch (Währung)
+
+            {
+
+                case "Dollar $":
+
+                    rate = 1.10;
+
+                    break;
+
+                case "Pfund £":
+
+                    rate = 0.85;
+
+                    break;
+
+                case "Yen ¥":
+
+                    rate = 160.50;
+
+                    break;
+
+                case "Lira ₺":
+
+                    rate = 35;
+
+                    break;
+
+                case "Dirham د. إ ":
+
+                    rate = 10;
+
+                    break;
+
+                default:
+
+                    MessageBox.Show("Unbekannte Währung ausgewählt.");
+
+                    return;
+
+            }
+
+            double result = euro * rate;
+
+            dollarBox.Text = result.ToString("F2");
+
+        }
+
+    }
+
+}

WährungsrechnerOOC.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+</Project>

WährungsrechnerOOC.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.13.35931.197 d17.13
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WährungsrechnerOOC", "WährungsrechnerOOC.csproj", "{07E8B74D-7967-4584-B2D9-E614252EE777}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{07E8B74D-7967-4584-B2D9-E614252EE777}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{07E8B74D-7967-4584-B2D9-E614252EE777}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{07E8B74D-7967-4584-B2D9-E614252EE777}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{07E8B74D-7967-4584-B2D9-E614252EE777}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1075A1FD-F275-4BDB-804E-B8AD906C91F7}
+	EndGlobalSection
+EndGlobal