make json import

.vscode/launch.json

@@ -11,7 +11,7 @@
             "preLaunchTask": "build",
             // If you have changed target frameworks, make sure to update the program path.
             "program": "${workspaceFolder}/bin/Debug/netcoreapp3.1/Bücherwurm.dll",
-            "args": [],
+            "args": ["books.json"],
             "cwd": "${workspaceFolder}",
             // For more information about the 'console' field, see https://aka.ms/VSCode-CS-LaunchJson-Console
             "console": "internalConsole",

Administration.cs

@@ -216,5 +216,10 @@ namespace Bücherwurm
                 Console.WriteLine("Ausleihe nicht bekannt oder bereits urückgegeben.");
             }
         }
+
+        public void MakeImport(string JsonText)
+        {
+            Catalogue.Import(JsonText);
+        }
     }
 }

Book.cs

@@ -1,23 +1,34 @@
+using System.Text.Json.Serialization;
+
 namespace Bücherwurm
 {
     class Book
     {
-        public int BookId {get;}
+        [JsonIgnoreAttribute]
+        public int BookId {get; set;}
 
+        [JsonPropertyName("title")]
         public string Title {get; set;}
 
+        [JsonPropertyName("author")]
         public string Author {get; set;}
 
+        [JsonPropertyName("country")]
         public string Country {get; set;}
 
+        [JsonPropertyName("imageLink")]
         public string ImageLink {get; set;}
 
+        [JsonPropertyName("link")]
         public string Link {get; set;}
 
+        [JsonPropertyName("language")]
         public string Language {get; set;}
 
+        [JsonPropertyName("pages")]
         public int Pages {get; set;}
 
+        [JsonPropertyName("year")]
         public int Year {get; set;}
 
         public Book(int Id, string Title, string Author,
@@ -34,5 +45,18 @@ namespace Bücherwurm
             this.Pages = Pages;
             this.Year = Year;
         }
+
+        public Book()
+        {
+            
+        }
+
+        public void OverwriteNullId(int Id)
+        {
+            if (BookId == 0)
+            {
+                BookId = Id;
+            }
+        }
     }
 }

BookImport.cs

@@ -0,0 +1,32 @@
+using System.Collections.Generic;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Bücherwurm
+{
+    public class BookIdConvert : JsonConverter<int>
+    {
+        public int NextId {get; set;}
+
+        public override int Read(ref Utf8JsonReader reader,
+                                 System.Type typeToConvert,
+                                 JsonSerializerOptions options)
+        {
+            var ret = this.NextId;
+            this.NextId = this.NextId++;
+            return ret;
+        }
+
+        public override void Write(Utf8JsonWriter writer,
+                                   int value,
+                                   JsonSerializerOptions options)
+        {
+            
+        }
+
+        public BookIdConvert(int InitId)
+        {
+            NextId = InitId;
+        }
+    }
+}

Catalogue.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Text.Json;
 
 namespace Bücherwurm
 {
@@ -12,12 +13,18 @@ namespace Bücherwurm
         public Catalogue()
         {
             Books = new List<Book>();
-            NextId = 0;
+            NextId = 1;
         }
 
         public void Import(string JsonString)
         {
-            throw new NotImplementedException();
+            var intermediateBooks = JsonSerializer.Deserialize<List<Book>>(JsonString);
+            foreach (var ibook in intermediateBooks)
+            {
+                ibook.OverwriteNullId(NextId);
+                NextId = NextId + 1;
+            }
+            Books = intermediateBooks;
         }
 
         public void Add(string Title, string Author,

Inventory.cs

@@ -10,19 +10,19 @@ namespace Bücherwurm
 
         public Inventory(){
             InventoryList = new List<Item>();
-            NextId = 0;
+            NextId = 1;
         }
 
         public void Add(Book Book)
         {
             InventoryList.Add(new Item(NextId, Book.BookId));
-            NextId = NextId++;
+            NextId = NextId + 1;
         }
 
         public void Add(int BookId)
         {
             InventoryList.Add(new Item(NextId, BookId));
-            NextId = NextId++;
+            NextId = NextId + 1;
         }
 
         public void Remove(int Id)

Lend_Administration.cs

@@ -14,14 +14,14 @@ namespace Bücherwurm
         {
             Lendings = new List<Lending>();
             ActiveLendings = new List<int>();
-            NextId = 0;
+            NextId = 1;
         }
 
         public void Lend(int[] ItemIds, string Customer)
         {
             Lendings.Add(new Lending(NextId, ItemIds, Customer));
             ActiveLendings.Add(NextId);
-            NextId = NextId++;
+            NextId = NextId + 1;
         }
 
         public void Return(int LendID)

Program.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 
 namespace Bücherwurm
 {
@@ -8,6 +9,13 @@ namespace Bücherwurm
         public static void Main(string[] args)
         {
             Admin = new Administration();
+            if (args.Length == 1)
+            {
+                Console.WriteLine("Versuche JSON Katalog von {0} zu importieren...", args[0]);
+                string jsonString = File.ReadAllText(args[0]);
+                Admin.MakeImport(jsonString);
+                Console.WriteLine("Erfolg!");
+            }
             var Continue = true;
             do
             {