public static void PropertyChangedEventArgsBeforeCallerMemberName()
{
var syntaxTree = CSharpSyntaxTree.ParseText(
@"
namespace N
{
using System.ComponentModel;
using System.Runtime.CompilerServices;
public class C : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
public int Bar { get; set; }
protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
{
this.PropertyChanged?.Invoke(this, e);
}
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}");
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var classDeclaration = syntaxTree.FindClassDeclaration("C");
var type = semanticModel.GetDeclaredSymbol(classDeclaration);
Assert.AreEqual(true, OnPropertyChanged.TryFind(type, semanticModel, CancellationToken.None, out var invoker));
Assert.AreEqual("N.C.OnPropertyChanged(string)", invoker.ToString());
}
public static void CachingInConcurrentDictionaryLocal(string expression)
{
var syntaxTree = CSharpSyntaxTree.ParseText(
@"
namespace N
{
using System.Collections.Concurrent;
using System.ComponentModel;
using System.Runtime.CompilerServices;
public class C : INotifyPropertyChanged
{
private static readonly ConcurrentDictionary<string, PropertyChangedEventArgs> Cache = new ConcurrentDictionary<string, PropertyChangedEventArgs>();
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
var e = Cache.GetOrAdd(propertyName ?? string.Empty, name => new PropertyChangedEventArgs(name));
this.PropertyChanged?.Invoke(this, e);
}
}
}".AssertReplace("propertyName ?? string.Empty", expression));
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var classDeclaration = syntaxTree.FindClassDeclaration("C");
var type = semanticModel.GetDeclaredSymbol(classDeclaration);
Assert.AreEqual(true, OnPropertyChanged.TryFind(type, semanticModel, CancellationToken.None, out var invoker));
Assert.AreEqual("N.C.OnPropertyChanged(string)", invoker.ToString());
}
public static void WhenCreatingPropertyChangedEventArgsSeparately()
{
var syntaxTree = CSharpSyntaxTree.ParseText(@"
namespace N
{
using System.ComponentModel;
using System.Runtime.CompilerServices;
public class C : INotifyPropertyChanged
{
private int bar;
public event PropertyChangedEventHandler PropertyChanged;
public int Bar
{
get => this.bar;
set
{
if (value == this.bar)
{
return;
}
this.bar = value;
this.OnPropertyChanged();
}
}
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
var handler = this.PropertyChanged;
if (handler != null)
{
var args = new PropertyChangedEventArgs(propertyName);
handler.Invoke(this, args);
}
}
}
}");
var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(syntaxTree);
var classDeclaration = syntaxTree.FindClassDeclaration("C");
var type = semanticModel.GetDeclaredSymbol(classDeclaration);
Assert.AreEqual(true, OnPropertyChanged.TryFind(type, semanticModel, CancellationToken.None, out var invoker));
Assert.AreEqual("N.C.OnPropertyChanged(string)", invoker.ToString());
}
public static void OverridingEvent()
{
var viewModelBaseCode = CSharpSyntaxTree.ParseText(@"
namespace N
{
using System.ComponentModel;
using System.Runtime.CompilerServices;
public class ViewModelBase : INotifyPropertyChanged
{
public virtual event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}");
var code = CSharpSyntaxTree.ParseText(@"
namespace N
{
using System.ComponentModel;
public class C : N.ViewModelBase
{
public override event PropertyChangedEventHandler PropertyChanged;
}
}");
var compilation = CSharpCompilation.Create("test", new[] { viewModelBaseCode, code }, MetadataReferences.FromAttributes());
var semanticModel = compilation.GetSemanticModel(code);
var classDeclaration = code.FindClassDeclaration("ViewModel");
var type = semanticModel.GetDeclaredSymbol(classDeclaration);
Assert.AreEqual(true, OnPropertyChanged.TryFind(type, semanticModel, CancellationToken.None, out var invoker));
Assert.AreEqual("N.ViewModelBase.OnPropertyChanged(string)", invoker.ToString());
}