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Add EventHandler<in TSender, in TEventArgs>, update EventHandler<TEventArgs> #115530

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Merged
tannergooding merged 4 commits into from
May 14, 2025
Merged

Add EventHandler<in TSender, in TEventArgs>, update EventHandler<TEventArgs> #115530

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7fec821
Add 'allows ref struct' to 'EventHandler<T>'
Sergio0694 May 13, 2025
5754299
Add 'EventHandler<,>'
Sergio0694 May 13, 2025
6778b44
Make 'TEventArgs' contravariant
Sergio0694 May 13, 2025
50ce58f
Add XML docs
Sergio0694 May 13, 2025
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14 changes: 13 additions & 1 deletion src/libraries/System.Private.CoreLib/src/System/EventHandler.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,5 +5,17 @@ namespace System
{
public delegate void EventHandler(object? sender, EventArgs e);

public delegate void EventHandler<TEventArgs>(object? sender, TEventArgs e); // Removed TEventArgs constraint post-.NET 4
public delegate void EventHandler<in TEventArgs>(object? sender, TEventArgs e) // Removed TEventArgs constraint post-.NET 4
where TEventArgs : allows ref struct;

/// <summary>
/// Represents the method that will handle an event when the event provides data.
/// </summary>
/// <typeparam name="TSender">The type of the object raising the event.</typeparam>
/// <typeparam name="TEventArgs">The type of the event data generated by the event.</typeparam>
/// <param name="sender">The source of the event.</param>
/// <param name="e">An object that contains the event data.</param>
public delegate void EventHandler<in TSender, in TEventArgs>(TSender sender, TEventArgs e)
where TSender : allows ref struct
where TEventArgs : allows ref struct;
}
3 changes: 2 additions & 1 deletion src/libraries/System.Runtime/ref/System.Runtime.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2789,7 +2789,8 @@ public partial class EventArgs
public EventArgs() { }
}
public delegate void EventHandler(object? sender, System.EventArgs e);
public delegate void EventHandler<TEventArgs>(object? sender, TEventArgs e);
public delegate void EventHandler<in TEventArgs>(object? sender, TEventArgs e) where TEventArgs : allows ref struct;
public delegate void EventHandler<in TSender, in TEventArgs>(TSender sender, TEventArgs e) where TSender : allows ref struct where TEventArgs : allows ref struct;
public partial class Exception : System.Runtime.Serialization.ISerializable
{
public Exception() { }
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