/// <summary>
/// LambdaExpression visit method
/// </summary>
/// <param name="lambda">The LambdaExpression to visit</param>
/// <returns>The visited LambdaExpression</returns>
internal virtual Expression VisitLambda(LambdaExpression lambda)
{
Expression body = this.Visit(lambda.Body);
if (body != lambda.Body)
{
#if !ASTORIA_LIGHT
return(Expression.Lambda(lambda.Type, body, lambda.Parameters));
#else
ParameterExpression[] parameters = new ParameterExpression[lambda.Parameters.Count];
lambda.Parameters.CopyTo(parameters, 0);
return(ExpressionHelpers.CreateLambda(lambda.Type, body, parameters));
#endif
}
return(lambda);
}
/// <summary>Gets a delegate that can be invoked to add an item to a collection of the specified type.</summary>
/// <param name='listType'>Type of list to use.</param>
/// <returns>The delegate to invoke.</returns>
internal static Action <object, object> GetAddToCollectionDelegate(Type listType)
{
Debug.Assert(listType != null, "listType != null");
Type listElementType;
MethodInfo addMethod = ClientTypeUtil.GetAddToCollectionMethod(listType, out listElementType);
ParameterExpression list = Expression.Parameter(typeof(object), "list");
ParameterExpression item = Expression.Parameter(typeof(object), "element");
Expression body = Expression.Call(Expression.Convert(list, listType), addMethod, Expression.Convert(item, listElementType));
#if ASTORIA_LIGHT
LambdaExpression lambda = ExpressionHelpers.CreateLambda(body, list, item);
#else
LambdaExpression lambda = Expression.Lambda(body, list, item);
#endif
return((Action <object, object>)lambda.Compile());
}