1 files changed, 5 insertions, 4 deletions
diff --git a/src/mscorlib/src/System/Runtime/InteropServices/TCEAdapterGen/EventSinkHelperWriter.cs b/src/mscorlib/src/System/Runtime/InteropServices/TCEAdapterGen/EventSinkHelperWriter.cs
index 0367e79bdd..862419cc98 100644
--- a/src/mscorlib/src/System/Runtime/InteropServices/TCEAdapterGen/EventSinkHelperWriter.cs
+++ b/src/mscorlib/src/System/Runtime/InteropServices/TCEAdapterGen/EventSinkHelperWriter.cs
@@ -8,6 +8,7 @@ namespace System.Runtime.InteropServices.TCEAdapterGen {
     using System.Reflection;
     using System.Reflection.Emit;
     using System.Collections;
+    using System.Diagnostics;
     using System.Diagnostics.Contracts;
     internal class EventSinkHelperWriter
     {
@@ -65,7 +66,7 @@ namespace System.Runtime.InteropServices.TCEAdapterGen {
                     // Retrieve the delegate type from the add_XXX method.
                     MethodInfo AddMeth = m_EventItfType.GetMethod( "add_" + aMethods[cMethods].Name );
                     ParameterInfo[] aParams = AddMeth.GetParameters();
-                    Contract.Assert(aParams.Length == 1, "All event interface methods must take a single delegate derived type and have a void return type");    
+                    Debug.Assert(aParams.Length == 1, "All event interface methods must take a single delegate derived type and have a void return type");    
                     Type DelegateCls = aParams[0].ParameterType;
 
                     // Define the delegate instance field.
@@ -119,7 +120,7 @@ namespace System.Runtime.InteropServices.TCEAdapterGen {
         {
             // Retrieve the method info for the invoke method on the delegate.
             MethodInfo DelegateInvokeMethod = DelegateCls.GetMethod( "Invoke" );
-            Contract.Assert(DelegateInvokeMethod != null, "Unable to find method Delegate.Invoke()");    
+            Debug.Assert(DelegateInvokeMethod != null, "Unable to find method Delegate.Invoke()");    
     
             // Retrieve the return type.
             Type ReturnType = Method.ReturnType;
@@ -229,7 +230,7 @@ namespace System.Runtime.InteropServices.TCEAdapterGen {
                         if ( ReturnType == typeof(IntPtr) )
                             il.Emit( OpCodes.Ldc_I4_0 );
                         else
-                            Contract.Assert(false, "Unexpected type for Primitive type.");    
+                            Debug.Assert(false, "Unexpected type for Primitive type.");    
                         break;
                 }
             }
@@ -254,7 +255,7 @@ namespace System.Runtime.InteropServices.TCEAdapterGen {
         {
             // Retrieve the constructor info for the base classe's constructor.
             ConstructorInfo DefaultBaseClsCons = typeof(Object).GetConstructor(BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public, null, Array.Empty<Type>(), null );
-            Contract.Assert(DefaultBaseClsCons != null, "Unable to find the constructor for class " + m_InputType.Name);    
+            Debug.Assert(DefaultBaseClsCons != null, "Unable to find the constructor for class " + m_InputType.Name);    
         
             // Define the default constructor.
             MethodBuilder Cons = OutputTypeBuilder.DefineMethod( ".ctor",