Use 'out' instead of 'ref' when calling a method with an out-parameter. Closes #57.

ICSharpCode.Decompiler/Ast/AstMethodBodyBuilder.cs

@@ -703,9 +703,20 @@ namespace Decompiler
 				}
 			}
 			// Default invocation
+			AdjustArgumentsForMethodCall(cecilMethod, methodArgs);
 			return target.Invoke(cecilMethod.Name, ConvertTypeArguments(cecilMethod), methodArgs).WithAnnotation(cecilMethod);
 		}
 		
+		static void AdjustArgumentsForMethodCall(MethodReference cecilMethod, List<Expression> methodArgs)
+		{
+			// Convert 'ref' into 'out' where necessary
+			for (int i = 0; i < methodArgs.Count && i < cecilMethod.Parameters.Count; i++) {
+				DirectionExpression dir = methodArgs[i] as DirectionExpression;
+				if (dir != null && cecilMethod.Parameters[i].IsOut)
+					dir.FieldDirection = FieldDirection.Out;
+			}
+		}
+		
 		static PropertyDefinition GetIndexer(MethodDefinition cecilMethodDef)
 		{
 			TypeDefinition typeDef = cecilMethodDef.DeclaringType;

ICSharpCode.Decompiler/Tests/ICSharpCode.Decompiler.Tests.csproj

@@ -13,6 +13,7 @@
     <NoStdLib>False</NoStdLib>
     <WarningLevel>4</WarningLevel>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <NoWarn>67,169</NoWarn>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Platform)' == 'x86' ">
     <PlatformTarget>x86</PlatformTarget>