oh dear

mscorlib/System/EventHandler.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Runtime.InteropServices;
+using Cpp2IlInjected;
+
+namespace System
+{
+	/// <summary>Represents the method that will handle an event that has no event data.</summary>
+	/// <param name="sender">The source of the event.</param>
+	/// <param name="e">An object that contains no event data.</param>
+	// Token: 0x020000E3 RID: 227
+	// (Invoke) Token: 0x0600089F RID: 2207
+	[Token(Token = "0x20000E3")]
+	[ComVisible(true)]
+	[Serializable]
+	public delegate void EventHandler(object sender, EventArgs e);
+}