I got this problem where I want to do this:

filtered = yearFolder.Children.Where(x=> (x.placement.First().Id) ==  source);

But yearFolder is dynamic and therefore I get the following error:

"Cannot use a lambda expression as an argument to a dynamically dispatched operation without first casting it to a delegate or expression tree type"

Full Code is below:

@inherits umbraco.MacroEngines.DynamicNodeContext
@using System.Globalization;
@{ 
    int source = Convert.ToInt32(@Parameter.source); 

    dynamic yearFolders = Model.NodeById(6207).Children.Where("NodeTypeAlias == \"IndholdMappeYear\"").OrderBy("createDate").Take(2);

    string caption = "";

    foreach (var yearFolder in yearFolders) {

        dynamic filtered;

        if (source == 0) {
            filtered = yearFolder;
        }else {
            filtered = yearFolder.Children.Where(x=> (x.placement.First().Id) ==  source);
        }

        foreach (var debat in filtered.Children) {      

        }
    }
}

Does anyone know a work-around ?

Im using Umbraco 4.11.10