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enabled nullable

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Holger Börchers
2020-02-22 22:31:19 +01:00
parent 153a9c3986
commit 0ebad36335
5 changed files with 96 additions and 57 deletions
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65
MvvmStuff/BaseViewModel.cs
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@ -2,7 +2,6 @@
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text.Json;
using System.Windows;
@ -12,34 +11,34 @@ namespace ModernWpfPlayground.MvvmStuff
{
public abstract class BaseViewModel : INotifyPropertyChanged
{
protected BaseViewModel()
{
_properties = GetType().GetProperties();
}
private readonly Dictionary<string, object> _valueDict = new Dictionary<string, object>();
private readonly PropertyInfo[] _properties;
protected bool SetProperty<T>(T value, [CallerMemberName] string propertyName = null)
protected bool SetProperty<T>(T value, Action<T>? onChanged = null,
[CallerMemberName] string? propertyName = null)
{
if(propertyName == null) throw new ArgumentNullException(nameof(propertyName));
if (_valueDict.TryGetValue(propertyName, out var obj) && Equals(value, obj)) return false;
_valueDict[propertyName] = value;
_valueDict[propertyName] = value!;
OnPropertyChanged(propertyName);
onChanged?.Invoke(value);
return true;
}
protected T GetProperty<T>(T defaultValue = default, [CallerMemberName] string propertyName = null)
protected T GetProperty<T>(T defaultValue = default, [CallerMemberName] string? propertyName = null)
{
if (propertyName == null) throw new ArgumentNullException(nameof(propertyName));
return _valueDict.TryGetValue(propertyName, out var obj) ? (T) obj : defaultValue;
}
public event PropertyChangedEventHandler PropertyChanged;
public event PropertyChangedEventHandler? PropertyChanged;
[NotifyPropertyChangedInvocator]
[PublicAPI]
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
{
if (propertyName == null) throw new ArgumentNullException(nameof(propertyName));
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
@ -63,50 +62,14 @@ namespace ModernWpfPlayground.MvvmStuff
}
}
protected void LoadViewModel()
protected void MapDictionary(IEnumerable<(string, object?)> tuples)
{
var openFileDialog = new OpenFileDialog {AddExtension = true, DefaultExt = "*.json"};
var result = openFileDialog.ShowDialog(Application.Current.MainWindow?.Owner);
if (result != true) return;
var contents = File.ReadAllText(openFileDialog.FileName);
var obj = JsonSerializer.Deserialize<Dictionary<string, JsonElement>>(contents);
foreach (var (key, value) in obj)
if (tuples == null) throw new ArgumentNullException(nameof(tuples));
foreach (var (key, value) in tuples)
{
_valueDict[key] = CastToType(key, value);
_valueDict[key] = value!;
OnPropertyChanged(key);
}
}
private object CastToType(string key, JsonElement value)
{
var property = Array.Find(_properties, x => x.Name == key);
if (property.PropertyType == typeof(double))
{
return value.GetDouble();
}
if (property.PropertyType == typeof(bool))
{
return value.GetBoolean();
}
if (property.PropertyType == typeof(int))
{
return value.GetInt32();
}
if (property.PropertyType.IsEnum)
{
return Enum.ToObject(property.PropertyType, value.GetInt32());
}
if (property.PropertyType == typeof(string))
{
return value.GetString();
}
return default;
}
}
}