fix: extra error messages

CarManagerV3/Car.cs

@@ -86,8 +86,20 @@ namespace CarManagerV3
         /// </returns>
         public static Car FromCsvString(string csv)
         {
-            string[] parts = csv.Split(';');
-            return new Car(int.Parse(parts[0]), parts[1], parts[2], int.Parse(parts[3]), parts[4], int.Parse(parts[5]), decimal.Parse(parts[6]));
+            try
+            {
+                string[] parts = csv.Split(';');
+                Car temp = new Car(int.Parse(parts[0]), parts[1], parts[2], int.Parse(parts[3]), parts[4], int.Parse(parts[5]), decimal.Parse(parts[6]));
+                if (temp.Year < 1886 || temp.Year > DateTime.Now.Year + 1) throw new Exception($"Invalid year: {temp.Year}");
+                if (temp.Mileage < 0) throw new Exception($"Mileage cannot be negative: {temp.Mileage}");
+                if (temp.Price < 0) throw new Exception($"Price cannot be negative: {temp.Price}");
+                return temp;
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"Error parsing CSV Car string: {ex.Message}");
+                return null;
+            }
         }
 
         /// <summary>

CarManagerV3/ImageManager.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Drawing;
 using System.Linq;
+using System.Linq.Expressions;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -18,10 +19,14 @@ namespace CarManagerV3
         public static void InitializeImageFolder()
         {
             string path = "images";
+            
             if (!System.IO.Directory.Exists(path))
             {
                 System.IO.Directory.CreateDirectory(path);
             }
+
+            // Do not catch here. If we cannot create our images folder, the program wont work.
+            
         }
 
         /// <summary>
@@ -47,15 +52,18 @@ namespace CarManagerV3
             FetchImage(car);
             string path = GetImagePath(car);
             // does image exist?
-            if (System.IO.File.Exists(path))
+            try
             {
-                return Image.FromFile(path);
+                if (System.IO.File.Exists(path))
+                {
+                    return Image.FromFile(path);
+                }
             }
-            else
+            catch (Exception ex)
             {
-                return Image.FromFile("images/no_image_available.png");
+                Console.Error.WriteLine($"Error loading image: {ex.Message}");
             }
-
+            return Image.FromFile("images/no_image_available.png");
         }
 
         /// <summary>

CarManagerV3/MainForm.cs

@@ -27,6 +27,7 @@ namespace CarManagerV3
             }
 
             SafeManager.InitializeFile(filepath);
+            StateManager.setFilePath(filepath);
             List<Car> _cars = SafeManager.ReadCars(filepath);
 
             refreshCars(_cars);

CarManagerV3/SafeManager.cs

@@ -4,6 +4,7 @@ using System.IO;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using System.Windows.Forms;
 
 
 namespace CarManagerV3
@@ -24,14 +25,22 @@ namespace CarManagerV3
         /// <param name="path">The path.</param>
         public static void InitializeFile(string path)
         {
-            if (!File.Exists(@path))
+            try
             {
-                using (StreamWriter writer = new StreamWriter(@path))
+                if (!File.Exists(@path))
                 {
-                    // Create the file, empty
-                    writer.WriteLine();
+                    using (StreamWriter writer = new StreamWriter(@path))
+                    {
+                        // Create the file, empty
+                        writer.WriteLine();
+                        writer.Close();
+                    }
                 }
             }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"Error initializing file: {ex.Message}");
+            }
         }
 
         /// <summary>
@@ -44,15 +53,38 @@ namespace CarManagerV3
         public static List<Car> ReadCars(string path)
         {
             List<Car> cars = new List<Car>();
-            using (StreamReader reader = new StreamReader(@path))
+            List<string> failedLines = new List<string>();
+            try
             {
-                string line;
-                while ((line = reader.ReadLine()) != null)
+                using (StreamReader reader = new StreamReader(@path))
                 {
-                    // Process the line
-                    if (line == "") continue;
-                    cars.Add(Car.FromCsvString(line));
+                    string line;
+                    while ((line = reader.ReadLine()) != null)
+                    {
+                        // Process the line
+                        if (line == "") continue;
+                        Car tmp = Car.FromCsvString(line);
+                        if (tmp == null)
+                        {
+                            failedLines.Add(line);
+                            continue;
+                        } 
+                        cars.Add(tmp);
+                    }
+                    reader.Close();
                 }
+            } catch (Exception ex)
+            {
+                Console.Error.WriteLine($"Error reading cars from file: {ex.Message}");
+            }
+            if (failedLines.Count > 0)
+            {
+                Console.Error.WriteLine($"Warning: {failedLines.Count} lines could not be parsed and were skipped.");
+                foreach (string failedLine in failedLines)
+                {
+                    Console.Error.WriteLine($"Failed line: {failedLine}");
+                }
+                MessageBox.Show($"Warning: {failedLines.Count} lines in the file could not be parsed and were skipped. Check the console for details.", "Parsing Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
             }
             return cars;
         }
@@ -64,12 +96,20 @@ namespace CarManagerV3
         /// <param name="cars">A <see cref="List{Car}"/> containing all cars to save.</param>
         public static void SaveCars(string path, List<Car> cars)
         {
-            using (StreamWriter writer = new StreamWriter(@path))
+            try
             {
-                foreach (Car car in cars)
+                using (StreamWriter writer = new StreamWriter(@path))
                 {
-                    writer.WriteLine(car.ToCsvString());
+                    foreach (Car car in cars)
+                    {
+                        writer.WriteLine(car.ToCsvString());
+                    }
+                    writer.Close();
                 }
+            } catch (Exception ex)
+            {
+                Console.Error.WriteLine($"Error saving cars to file: {ex.Message}");
+                MessageBox.Show($"Error saving cars to file: {ex.Message}", "Save Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
             }
         }
 
@@ -83,29 +123,37 @@ namespace CarManagerV3
         public static void AddRecentPath(string path)
         {
             List<string> paths = new List<string>();
-            if (File.Exists(recentPathsFile))
+            try
             {
-                using (StreamReader reader = new StreamReader(recentPathsFile))
+                if (File.Exists(recentPathsFile))
                 {
-                    string line;
-                    while ((line = reader.ReadLine()) != null)
+                    using (StreamReader reader = new StreamReader(recentPathsFile))
                     {
-                        paths.Add(line);
+                        string line;
+                        while ((line = reader.ReadLine()) != null)
+                        {
+                            paths.Add(line);
+                        }
+                        reader.Close();
                     }
                 }
-            }
-            paths.Remove(path);
-            paths.Insert(0, path);
-            if (paths.Count > 5)
-            {
-                paths = paths.Take(5).ToList();
-            }
-            using (StreamWriter writer = new StreamWriter(recentPathsFile))
-            {
-                foreach (string p in paths)
+                paths.Remove(path);
+                paths.Insert(0, path);
+                if (paths.Count > 5)
                 {
-                    writer.WriteLine(p);
+                    paths = paths.Take(5).ToList();
                 }
+                using (StreamWriter writer = new StreamWriter(recentPathsFile))
+                {
+                    foreach (string p in paths)
+                    {
+                        writer.WriteLine(p);
+                    }
+                    writer.Close();
+                }
+            } catch (Exception ex)
+            {
+                Console.Error.WriteLine($"Error managing recent paths: {ex.Message}");
             }
         }
 
@@ -118,16 +166,23 @@ namespace CarManagerV3
         public static List<string> GetRecentPaths()
         {
             List<string> paths = new List<string>();
-            if (File.Exists(recentPathsFile))
+            try
             {
-                using (StreamReader reader = new StreamReader(recentPathsFile))
+                if (File.Exists(recentPathsFile))
                 {
-                    string line;
-                    while ((line = reader.ReadLine()) != null)
+                    using (StreamReader reader = new StreamReader(recentPathsFile))
                     {
-                        paths.Add(line);
+                        string line;
+                        while ((line = reader.ReadLine()) != null)
+                        {
+                            paths.Add(line);
+                        }
+                        reader.Close();
                     }
                 }
+            } catch (Exception ex)
+            {
+                Console.Error.WriteLine($"Error reading recent paths: {ex.Message}");
             }
             return paths;
         }