Merge pull request #3381 from krytarowski/netbsd-support-20

[mono.git] / mcs / class / corlib / System / Delegate.cs

diff --git a/mcs/class/corlib/System/Delegate.cs b/mcs/class/corlib/System/Delegate.cs
index 6900c420bff44087199bfd5286c1e4d0415c9575..4064ed9c90185ac0eec46c390977a61b4340a0f9 100644 (file)
--- a/mcs/class/corlib/System/Delegate.cs
+++ b/mcs/class/corlib/System/Delegate.cs
@@ -534,6 +534,12 @@ namespace System
                        if (a == null)
                                return b;
 
+                       if (b == null)
+                               return a;
+
+                       if (a.GetType () != b.GetType ())
+                               throw new ArgumentException (Locale.GetText ("Incompatible Delegate Types. First is {0} second is {1}.", a.GetType ().FullName, b.GetType ().FullName));
+
                        return a.CombineImpl (b);
                }