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Code Issues 1 Projects 1 Releases Wiki Activity

improvements persisting view model properties

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Holger Börchers
2020-02-24 21:31:20 +01:00
parent 59d711da53
commit 046639681f
4 changed files with 74 additions and 45 deletions
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80
WindowViewModel.cs
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@@ -15,6 +15,31 @@ namespace ModernWpfPlayground
{
private readonly PropertyInfo[] _properties;
private string? _path;
private string _title = AppName;
private const string AppName = "TaBEA 3.0.0";
public string? Path
{
get => _path;
private set
{
if (Equals(_path, value)) return;
_path = value;
OnPropertyChanged();
Title = value != null ? $"{System.IO.Path.GetFileName(value)} - {AppName}" : AppName;
}
}
public string Title
{
get => _title;
set
{
if (Equals(_title, value)) return;
_title = value;
OnPropertyChanged();
}
}
public WindowViewModel()
{
@@ -22,7 +47,11 @@ namespace ModernWpfPlayground
CloseCommand = new RelayCommand(x => Application.Current.Shutdown());
OpenViewModelCommand = new RelayCommand(x => LoadViewModel());
SaveViewModelCommand = new RelayCommand(x => SaveViewModel());
ResetViewModelCommand = new RelayCommand(x => ResetViewModel());
ResetViewModelCommand = new RelayCommand(x =>
{
ResetViewModel();
Path = null;
});
_properties = GetType().GetProperties();
}
@@ -78,26 +107,6 @@ namespace ModernWpfPlayground
public ICommand ResetViewModelCommand { get; }
private void LoadViewModel()
{
var list = ReadFromJson();
MapDictionary(list);
}
private IEnumerable<(string, object?)> ReadFromJson()
{
var openFileDialog = new OpenFileDialog { AddExtension = true, DefaultExt = "*.json" };
var result = openFileDialog.ShowDialog(Application.Current.MainWindow?.Owner);
if (result != true) yield break;
var contents = File.ReadAllText(_path = openFileDialog.FileName);
var obj = JsonSerializer.Deserialize<Dictionary<string, JsonElement>>(contents);
foreach (var (key, value) in obj)
{
yield return (key, CastToType(key, value));
}
}
private object? CastToType(string key, JsonElement value)
{
@@ -106,6 +115,7 @@ namespace ModernWpfPlayground
{
return default;
}
if (property.PropertyType == typeof(double))
{
return value.GetDouble();
@@ -133,5 +143,33 @@ namespace ModernWpfPlayground
return default;
}
private void SaveViewModel()
{
var contents = JsonSerializer.Serialize(Values);
if (Path == null)
{
var saveFileDialog = new SaveFileDialog {AddExtension = true, DefaultExt = "*.json"};
var result = saveFileDialog.ShowDialog(Application.Current.MainWindow?.Owner);
if (result != true) return;
Path = saveFileDialog.FileName;
}
File.WriteAllText(Path, contents);
}
protected override IEnumerable<(string key, object? value)> GetViewModelItems()
{
var openFileDialog = new OpenFileDialog {AddExtension = true, DefaultExt = "*.json"};
var result = openFileDialog.ShowDialog(Application.Current.MainWindow?.Owner);
if (result != true) yield break;
var contents = File.ReadAllText(Path = openFileDialog.FileName);
var obj = JsonSerializer.Deserialize<Dictionary<string, JsonElement>>(contents);
foreach (var (key, value) in obj)
{
yield return (key, CastToType(key, value));
}
}
}
}