oh dear

mscorlib/System/Threading/TimerCallback.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Runtime.InteropServices;
+using Cpp2IlInjected;
+
+namespace System.Threading
+{
+	/// <summary>Represents the method that handles calls from a <see cref="T:System.Threading.Timer" />.</summary>
+	/// <param name="state">An object containing application-specific information relevant to the method invoked by this delegate, or <see langword="null" />.</param>
+	// Token: 0x02000350 RID: 848
+	// (Invoke) Token: 0x06001E89 RID: 7817
+	[Token(Token = "0x2000350")]
+	[ComVisible(true)]
+	public delegate void TimerCallback(object state);
+}