Programmiererforum

class SaveLoad
{
public static void Save(Board board) {
Microsoft.Win32.SaveFileDialog dlg = new Microsoft.Win32.SaveFileDialog();
dlg.FileName = "Document";
dlg.DefaultExt = ".txt";
dlg.Filter = "Text documents (.txt)|*.txt";
Nullable result = dlg.ShowDialog();
if (result == true)
{
string outpath = dlg.FileName;
string jsonData = JsonConvert.SerializeObject(board, Newtonsoft.Json.Formatting.Indented);
var myFile = File.Create(outpath);
myFile.Close();
File.WriteAllText(@"" + outpath, jsonData);
}
}

public static Board Load()
{
Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
dlg.FileName = "Document";
dlg.DefaultExt = ".txt";
dlg.Filter = "Text documents (.txt)|*.txt";
Nullable result = dlg.ShowDialog();
if (result == true)
{
string outpath = dlg.FileName;
string jsonData = File.ReadAllText(outpath);
return JsonConvert.DeserializeObject(jsonData);
}
else { return null; }
}
}

internal class Board
{
public StrokeCollection strokes;
public UIElementCollection elements;
public UIElementCollection elements_serialized = new UIElementCollection(new UIElement(),new FrameworkElement());

public Board(StrokeCollection strokes, UIElementCollection elements) { this.strokes = strokes; this.elements = elements; }

public void Serialize() {
foreach (UIElement element in this.elements) {
elements_serialized.Add(Clone(element));
}
}

public Board getSerialized() {
return new Board(strokes,elements_serialized);
}

public static T Clone(T element)
{
string xaml = XamlWriter.Save(element);
using (StringReader stringReader = new StringReader(xaml))
using (XmlReader xmlReader = XmlReader.Create(stringReader))
return (T)XamlReader.Load(xmlReader);
}
}

Board board = new Board(mainInk.Strokes, mainInk.Children);
board.Serialize();
SaveLoad.Save(board.getSerialized());

 Board board = SaveLoad.Load();
if (board == null) {
mainInk.Strokes = board.strokes;
mainInk.Children.Clear();
foreach (UIElement element in board.elements)
{
mainInk.Children.Add(Board.Clone(element));
}
}

Ich versuche Striche und untergeordnete Elemente aus einem WPF InkCanvas zu speichern. Ich habe es geschafft, die Datei zu speichern, aber jetzt kann ich sie nicht laden. Es wird diese Ausnahme ausgelöst:
Newtonsoft.Json.JsonSerializationException
HResult=0x80131500
Message=Es konnte kein Konstruktor zur Verwendung für den Typ System.Windows.Ink.Stroke gefunden werden . Eine Klasse sollte entweder einen Standardkonstruktor, einen Konstruktor mit Argumenten oder einen Konstruktor haben, der mit dem JsonConstructor-Attribut gekennzeichnet ist. Pfad „Striche[0].DrawingAttributes“, Zeile 4, Position 26.
Source=Newtonsoft.Json
Code zum Speichern/Laden von Klassen:
[code]class SaveLoad
{
public static void Save(Board board) {
Microsoft.Win32.SaveFileDialog dlg = new Microsoft.Win32.SaveFileDialog();
dlg.FileName = "Document";
dlg.DefaultExt = ".txt";
dlg.Filter = "Text documents (.txt)|*.txt";
Nullable result = dlg.ShowDialog();
if (result == true)
{
string outpath = dlg.FileName;
string jsonData = JsonConvert.SerializeObject(board, Newtonsoft.Json.Formatting.Indented);
var myFile = File.Create(outpath);
myFile.Close();
File.WriteAllText(@"" + outpath, jsonData);
}
}

public static Board Load()
{
Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
dlg.FileName = "Document";
dlg.DefaultExt = ".txt";
dlg.Filter = "Text documents (.txt)|*.txt";
Nullable result = dlg.ShowDialog();
if (result == true)
{
string outpath = dlg.FileName;
string jsonData = File.ReadAllText(outpath);
return JsonConvert.DeserializeObject(jsonData);
}
else { return null; }
}
}

internal class Board
{
public StrokeCollection strokes;
public UIElementCollection elements;
public UIElementCollection elements_serialized = new UIElementCollection(new UIElement(),new FrameworkElement());

public Board(StrokeCollection strokes, UIElementCollection elements) { this.strokes = strokes; this.elements = elements; }

public void Serialize() {
foreach (UIElement element in this.elements) {
elements_serialized.Add(Clone(element));
}
}

public Board getSerialized() {
return new Board(strokes,elements_serialized);
}

public static T Clone(T element)
{
string xaml = XamlWriter.Save(element);
using (StringReader stringReader = new StringReader(xaml))
using (XmlReader xmlReader = XmlReader.Create(stringReader))
return (T)XamlReader.Load(xmlReader);
}
}
[/code]
Code zum Speichern:
[code]Board board = new Board(mainInk.Strokes, mainInk.Children);
board.Serialize();
SaveLoad.Save(board.getSerialized());
[/code]
Code zum Laden:
[code] Board board = SaveLoad.Load();
if (board == null) {
mainInk.Strokes = board.strokes;
mainInk.Children.Clear();
foreach (UIElement element in board.elements)
{
mainInk.Children.Add(Board.Clone(element));
}
}
[/code]