Request v4 debugger interface only for v4 applications

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@5189 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Debugger/Debugger.Core/NDebugger.cs

@@ -114,7 +114,15 @@ namespace Debugger
 			}
 			this.debuggeeVersion = debuggeeVersion;
 			
-			corDebug = NativeMethods.CreateDebuggingInterfaceFromVersion(4 /* .NET 4 */, debuggeeVersion);
+			int debuggerVersion;
+			// The CLR does not provide 4.0 debugger interface for older versions
+			if (debuggeeVersion.StartsWith("v1") || debuggeeVersion.StartsWith("v2")) {
+				debuggerVersion = 3; // 2.0 CLR
+			} else {
+				debuggerVersion = 4; // 4.0 CLR
+			}
+			
+			corDebug = NativeMethods.CreateDebuggingInterfaceFromVersion(debuggerVersion, debuggeeVersion);
 			TrackedComObjects.Track(corDebug);
 			
 			managedCallbackSwitch = new ManagedCallbackSwitch(this);