Are you referencing the LINQ assembly?

Yep, here's my macro code:

<umbraco:Macro runat="server" language="razor">
@using System.Linq
@using System.Xml.Linq

@foreach(dynamic page in Model.Children.OrderBy("publishDate descending").Take(5)) {
  <div>
 <h1>@page.Name</h1>
    <p><a href="@page.Url">Listen</a></p>
  </div>
}
</umbraco:Macro>

Actually, using "First()" doesn't work either.

Model.Children.OrderBy("publishDate descending").First()

Error loading Razor Script 
'umbraco.MacroEngines.DynamicNodeList' does not contain a definition for 'First'

Is this expected behavior, or am I doing something wrong, or is this a bug?

Ok, so for the time being I'm having to do something like this:

<umbraco:Macro runat="server" language="razor">
@using System.Linq
@using System.Xml.Linq

@{
    var node = new DynamicNode(Model.Id);
    var pages = node.GetChildrenAsList.Items.AsQueryable().OrderByDescending(tt  => DateTime.Parse(tt.GetProperty("publishDate").Value));
    var firstPage = pages.First();

    <div id="first-page">
        <h1>@firstPage.Name</h1>
        <p><a href="@firstPage.Url">Listen</a></p>
    </div>

    <div id="remaining-pages">
        foreach(dynamic page in pages.Skip(1).Take(5)) {
          <div>
                <h1>@page.Name</h1>
                <p><a href="@page.Url">Listen</a></p>
          </div>
        }
    </div>
}
</umbraco:Macro>

Setting the node and pages variables seems like a bit of overkill to get what I'm trying to access. Shouldn't just doing Model.Children.OrderBy("publishDate descending").First() work?

Hi Michael

Yes, the Linq extension methods should be working off DynamicNodeList
I've just checked with my copy, and they do - what version are you running?

If it's 4.7 final, that's very odd - I haven't changed anything to do wtih DyamicNodeList & Enumerable methods in quite a while.

I'm running 4.7 final. It was an upgrade from 4.6.2 so maybe I'm missing something?

I'm still having issues. The same thing on another site I'm building that was an upgrade as well.  Here is a simple macro that doesn't work:

@using System.Linq
@using System.Xml.Linq

@{
  dynamic matches = Model.AncestorOrSelf(1).Descendants("Properties-Unit").Where("SquareFeet > 1000");

  <p>@matches.First().Name</p>
}

I get the following error:

Error loading Razor Script
'umbraco.MacroEngines.DynamicNodeList' does not contain a definition for 'First'

What's going on here? I've made sure I followed the upgrade guide, I even used the 4.7 web.config and just changed the umbracoDbDSN and umbracoConfigurationStatus nodes, and then added the uComponents references in it. I'm not sure what else I can do. This is very strange :-/

Sure thing. I really appreciate it! Will call you in a minute. Thanks!

Spoke with Gareth on Skype and he figured out it was 2 dlls causing problems. I had to remove the Microsoft.Dynamic.dll and also Microsoft.Scripting.Debugging.dll. Posting this just in case someone else runs into a similar issue in the future.

Thanks so much Gareth! You're a badass!

I have this same problem but I don't have those DLLs. Any ideas?

Here is my code:

@using System.Linq
@using System.Xml.Linq

@inherits umbraco.MacroEngines.DynamicNodeContext

@helper getPageTitle(dynamic node)
{
 <text>@(!String.IsNullOrEmpty(@node.Title) ? @node.Title : @node.Name)</text>
}

<ul>
@{
  var news = @Model.NodeById(@Parameter.Group).Children;
  news = news.Where("nodeTypeAlias.Equals(\"Special\")").OrderBy("publicationDate desc");
 
  if (@Parameter.IsArchive == "1") {
    news = news.Where("expirationDate < DateTime.Now");
  } else {
    news = news.Where("expirationDate > DateTime.Now && publicationDate < DateTime.Now");
  }
 
  var limit = 0;
  int.TryParse(@Parameter.Limit, out limit);
  if (limit > 0) {
    news = news.Take(limit);
  }
}
@foreach(var item in @news)
{
  <li><a href="@item.Url">@getPageTitle(@item)</a>
      <span>@item.publicationDate.ToString("MMM d, yyyy")</span></li>
}
</ul>

I couldn't get it working dynamicaly. So I had to cast everything as its type.

@using System.Linq
@using System.Xml.Linq
@using umbraco.MacroEngines

@inherits DynamicNodeContext

@helper getPageTitle(dynamic node)
    {
 <text>@(!String.IsNullOrEmpty(@node.Title) ? @node.Title : @node.Name)</text>
}

<ul>
@{
    List<DynamicNode> news = ((DynamicNodeList)@Model.NodeById(@Parameter.Group).Children).Items;
    //news = news.Where("nodeTypeAlias.Equals(\"Special\")").OrderBy("publicationDate desc");
    news = news.Where(x => x.NodeTypeAlias.Equals("Special")).OrderByDescending(x => x.GetProperty("publicationDate").Value).ToList();
    if (@Parameter.IsArchive == "1")
    {
        //news = news.Where("expirationDate < DateTime.Now");
        news = news.Where(x => DateTime.Parse(x.GetProperty("expirationDate").Value) < DateTime.Now).ToList();
    }
    else
    {
        //news = news.Where("expirationDate > DateTime.Now && publicationDate < DateTime.Now");
        news = news.Where(x => DateTime.Parse(x.GetProperty("expirationDate").Value) > DateTime.Now
                            && DateTime.Parse(x.GetProperty("publicationDate").Value) < DateTime.Now).ToList();
    }

    int limit = 0;
    int.TryParse(@Parameter.Limit, out limit);
    if (limit > 0)
    {
        news = news.Take(limit).ToList();
    }
}
@foreach (DynamicNode item in @news)
{
  <li><a href="@item.Url">@getPageTitle(@item)</a>
      <span>@String.Format(item.GetProperty("publicationDate").Value, "MMM d, yyyy")</span></li>
}
</ul>

NHibernate is another DLL that seems to cause this issue, which is a problem because a number of umbraco packages seem to use it.  See the work item http://umbraco.codeplex.com/workitem/30570 on the Umbraco code plex page for instructions to reproduce the issue from a base install of Umbraco 4.7.1 and vote if this reflects the problems occurring in your applicaiton.

In my case,

Model.Children.Take

was working, but uninstalling Umbraco Contour removed my Umbraco.Forms.Core.dll, which contains the "Take" extension method (I guess, did not bother to have a look at the source code).

Hence, after recovering the Umbraco.Forms.Core.dll, my template just work...again.

No

@using System.Linq
@using System.Xml.Linq


required.

In short, all assemblies need all their dependencies in 4.7.1.x to be present for the extension method discovery to work.

If you're having a problem, make sure you're running 4.7.1 and you'll see a lot more debugging in the ?umbDebugShowTrace=true output which should help to identify the offending DLL and then either remove it, or add whichever dependency is required (often when you've upgraded a site, or replaced a plugin, some DLLs are left behind but their dependencies are gone or replaced)

Hope this generalised answer identifies the issue for someone later.

Gareth

hey guys how do i check the bin folder for errors guys

Error loading RazorScript 
'umbraco.MacroEngines.DynamicNodeList' does not contain a definition for'any'

I have the same error.

Microsoft.Dynamic.dll and also Microsoft.Scripting.Debugging.dll - from where you removed it? You had it in project references?(I dont have these references and still have a problem).

is working on a reply...