private static object TryCompile(ref ClosureInfo closureInfo,
Type delegateType, Type[] paramTypes, Type returnType,
Expression bodyExpr, IList <ParameterExpression> paramExprs)
{
if (!TryCollectBoundConstants(ref closureInfo, bodyExpr, paramExprs))
{
return(null);
}
if (closureInfo != null)
{
closureInfo.ConstructClosure();
}
var method = GetDynamicMethod(paramTypes, returnType, closureInfo);
var il = method.GetILGenerator();
if (!EmittingVisitor.TryEmit(bodyExpr, paramExprs, il, closureInfo))
{
return(null);
}
il.Emit(OpCodes.Ret); // emits return from generated method
// create open delegate with closure object
if (closureInfo == null)
{
return(method.CreateDelegate(delegateType));
}
return(method.CreateDelegate(delegateType, closureInfo.ClosureObject));
}