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Exception in template (eCom/Productlist/ProductList.cshtml): System.NullReferenceException: Object reference not set to an instance of an object.
   at CompiledRazorTemplates.Dynamic.acacfbcccef.Execute()
   at RazorEngine.Templating.TemplateBase.RazorEngine.Templating.ITemplate.Run(ExecuteContext context)
   at RazorEngine.Razor.Parse[T](String razorTemplate, T model, String cacheName)
   at Dynamicweb.Rendering.Template.Output()
@inherits Dynamicweb.Rendering.RazorTemplateBase<Dynamicweb.Rendering.RazorTemplateModel<Dynamicweb.Rendering.Template>>

@{
    string GroupId = GetString("Ecom:Group.ID");
    var SubGroups = GetLoop("Subgroups");
    string ProductCataloguePage = Firstweb.Custom.CustomCode.Frontend.Helpers.AreaItems.GetString("ProductCataloguePage");
    bool DiscountSplash = Firstweb.Custom.CustomCode.Frontend.Helpers.AreaItems.GetInt("AktiverRabatSplash") == 1 ? true : false;
    var CurrentGroup = Dynamicweb.eCommerce.Products.Group.GetGroupByID(GroupId);
    string ProductListWidth = "span9";
}

<h1>@GetString("Ecom:Group.Name")</h1>

<div class="js-description js-group-list">
        @GetString("Ecom:Group.Description")
</div>
<div class="read-more">
  <i class="icon-angle-down"></i>
  <span class="read-more-collapsed">L&aelig;s mere</span>
  <span class="read-more-expanded">L&aelig;s mindre</span>      
</div>

@if (IsTopLevelGroup(GroupId))
{
    <div class="category-list">

        @foreach (var SubGroup in SubGroups)
        {
            string Name = SubGroup.GetString("Ecom:Group.Name");
            string Link = SubGroup.GetString("Ecom:Group.Link.Clean");
            string Image = SubGroup.GetString("Ecom:Group.SmallImage");

            <a href="@Link" class="category-item">
                <img src="@Image" alt="@Name" />
                <h3 class="name">@Name</h3>
            </a>
        }

    </div>
}
else if (IsTopLevelGroup(GetParentGroup(GroupId).ID) )
{
    var ModelGroups = SubGroups.Where(g => g.GetString("Ecom:Group.Number") == "MODEL");
    var SizeGroups = SubGroups.Where(g => g.GetString("Ecom:Group.Number") == "SIZE");

    foreach (var ModelGroup in ModelGroups)
    {
        var Models = ModelGroup.GetLoop("Childgroups").ToList();
        if (Models.Any())
        {
            <div class="model-list">

                @foreach (var Model in Models)
                {
                    string Name = Model.GetString("Ecom:Group.Name");
                    string Link = Model.GetString("Ecom:Group.Link.Clean");
                    string Image = Model.GetString("Ecom:Group.SmallImage");
                    bool ShowInMenu = Model.GetBoolean("Ecom:Group.ShowInMenu");

                    if (ShowInMenu != false) {
                        <a href="@Link" class="model-item">
                            <img src="@Image" alt="@Name" />
                            <p class="name">@Name</p>
                        </a>
                    }
                }

            </div>
        }
    }

    <div class="row">

        @if (SizeGroups.Any())
        {
            <div class="span3">
                <div class="formats">
                    <div class="format-selector">

                        <span>@Translate("SelectFormat", "V&aelig;lg format")</span>

                    </div>

                    <div class="format-list">

                        @foreach (var SizeGroup in SizeGroups)
                        {
                            var Sizes = SizeGroup.GetLoop("Childgroups").ToList();
                            <div class="format-list">

                                @foreach (var Size in Sizes)
                                {
                                    string Name = Size.GetString("Ecom:Group.Name");
                                    string Link = Size.GetString("Ecom:Group.Link.Clean");
                                    <a href="@Link" class="format-item">
                                        <span>@Name</span>
                                    </a>
                                }

                            </div>
                        }

                    </div>
                </div>
            </div>
        }
        else
        {
            ProductListWidth = "span12";
        }

        <div class="@ProductListWidth">
            <div class="product-list">

                @foreach (var Product in GetLoop("Products"))
                {
                    @RenderProduct(Product, ProductCataloguePage, DiscountSplash)
                }

            </div>
        </div>

    </div>

}
else if (GetParentGroup(GroupId).Number == "SIZE" || GetParentGroup(GroupId).Number == "MODEL")
{
    var GrandParentGroup = GetParentGroup(GetParentGroup(GroupId).ID);
    var ModelGroups = GrandParentGroup.Subgroups.Where(g => g.Number == "MODEL").FirstOrDefault();
    var SizeGroups = GrandParentGroup.Subgroups.Where(g => g.Number == "SIZE").FirstOrDefault();

    if (GetParentGroup(GroupId).Number == "MODEL")
    {
        SizeGroups = CurrentGroup;
    }

    if (ModelGroups.Subgroups.Any())
    {
        <div class="model-list">

            @foreach (var Model in ModelGroups.Subgroups)
            {
                string Name = Model.Name;
                string Link = ProductCataloguePage + "&groupid=" + Model.ID;
                string Image = "/Files" + Model.SmallImage;
                string SelectedClass = Model.ID == GroupId ? "selected" : "";

                bool ShowInMenu = Model.NavigationShowInMenu;

                if (ShowInMenu != false) {            
                    <a href="@Link" class="model-item @SelectedClass">
                        <img src="@Image" alt="@Name" />
                        <p class="name">@Name</p>
                    </a>
                }
            }

        </div>
    }

    <div class="row">

        @if (SizeGroups.Subgroups.Any())
        {
            <div class="span3">
                <div class="formats">
                    <div class="format-selector">

                        <span>@Translate("SelectFormat", "V&aelig;lg format")</span>

                    </div>

                    <div class="format-list">
                        @foreach (var Size in SizeGroups.Subgroups)
                        {
                            string Name = Size.Name;
                            string Link = ProductCataloguePage + "&groupid=" + Size.ID;
                            string SelectedClass = Size.ID == GroupId ? "selected" : "";
                            <a href="@Link" class="format-item @SelectedClass">
                                <span>@Name</span>
                            </a>
                        }
                    </div>
                </div>
            </div>

        }
        else
        {
            ProductListWidth = "span12";
        }

        <div class="@ProductListWidth">
            <div class="product-list">

                @foreach (var Product in GetLoop("Products"))
                {
                    @RenderProduct(Product, ProductCataloguePage, DiscountSplash)
                }

            </div>
        </div>

    </div>
}
else
{
    var GrandParentGroup = GetParentGroup(GetParentGroup(GroupId).ID);
    var SizeGroups = GetParentGroup(GroupId);
    var ModelGroups = GrandParentGroup.Subgroups;
    var AncestorGroups = GetAllAncestorGroups(GroupId);

    if (ModelGroups.Any())
    {
        <div class="model-list">

            @foreach (var Model in ModelGroups)
            {
                string Name = Model.Name;
                string Link = ProductCataloguePage + "&groupid=" + Model.ID;
                string Image = "/Files" + Model.SmallImage;
                string SelectedClass = AncestorGroups.Where(ag => ag.ID == Model.ID).Any() ? "selected" : "";
                <a href="@Link" class="model-item @SelectedClass">
                    <img src="@Image" alt="@Name" />
                    <p class="name">@Name</p>
                </a>
            }

        </div>
    }

    <div class="row">

        @if (SizeGroups.Subgroups.Any())
        {
            <div class="span3">
                <div class="formats">
                    <div class="format-selector">

                        <span>@Translate("SelectFormat", "V&aelig;lg format")</span>

                    </div>

                    <div class="format-list">
                        @foreach (var Size in SizeGroups.Subgroups)
                        {
                            string Name = Size.Name;
                            string Link = ProductCataloguePage + "&groupid=" + Size.ID;
                            string SelectedClass = Size.ID == GroupId ? "selected" : "";
                            <a href="@Link" class="format-item @SelectedClass">
                                <span>@Name</span>
                            </a>
                        }
                    </div>
                </div>
            </div>

        }
        else
        {
            ProductListWidth = "span12";
        }

        <div class="@ProductListWidth">
            <div class="product-list">

                @foreach (var Product in GetLoop("Products"))
                {
                    @RenderProduct(Product, ProductCataloguePage, DiscountSplash)
                }

            </div>
        </div>

    </div>
}


<div>
    @GetString("Ecom:Group:Field.GroupDescriptionBottom.Value.Clean")
</div>

@helper RenderProduct(LoopItem Product, string ProductCataloguePage, bool DiscountSplash)
{
    string Name = Product.GetString("Ecom:Product.ShortDescription.Raw");
    string Image = Product.GetString("Ecom:Product.ImageLarge.Clean");
    string ProductId = Product.GetString("Ecom:Product.ID");
    string GroupId = Product.GetString("Ecom:Product.PrimaryOrFirstGroupID");
    string Link = ProductCataloguePage + "&groupid=" + GroupId + "&productid=" + ProductId;
    string Price = Product.GetString("LowestPrice.Formated");
    int VariantCount = Product.GetInteger("Ecom:Product.VariantCount");
    string SaveAtLeast = Product.GetString("Display.Product.SaveAtLeastPrice.PriceWithoutVATFormatted");

    <a href="@Link" class="product-item">
        @if (!string.IsNullOrWhiteSpace(SaveAtLeast)) {
            <div class="product-list-ribbon">
              @Translate("SaveRibbonText", "Spar mindst")<br>@SaveAtLeast
            </div>
        }
        <div class="image-container">
            <img src="@Image" alt="@Product.GetString("Ecom:Product.Name")" />
            @if (DiscountSplash)
            {
                <div class="product-list-splash">
                    <p>-10%</p>
                </div>
            }
        </div>

        <div class="description">@Name</div>

        <div class="price">

            @if (VariantCount > 0)
            {
                <p>@Translate("eCom_Productlist_ViewMoreLinkText", "Se mere")</p>
            }
            else
            {
                <p>@Translate("PriceFrom", "Pris fra") @Price</p>
            }
        </div>

    </a>
}

@functions {

    private bool IsTopLevelGroup(string Id)
    {
        return Dynamicweb.eCommerce.Products.Group.GetGroupByID(Id).IsTopGroup;
    }

    private Dynamicweb.eCommerce.Products.Group GetParentGroup(string Id)
    {
        var _return = new Dynamicweb.eCommerce.Products.Group();
        var ParentGroups = Dynamicweb.eCommerce.Products.Group.GetGroupByID(Id).ParentGroups;
        if (ParentGroups.Count > 0)
        {
            _return = ParentGroups.FirstOrDefault();
        }
        return _return;
    }

    private List<Dynamicweb.eCommerce.Products.Group> GetAllAncestorGroups(string Id)
    {
        var _return = new List<Dynamicweb.eCommerce.Products.Group>();
        string IdToAskAbout = Id;
        bool TopLevelGroupFound = false;
        do
        {
            var ParentGroup = GetParentGroup(IdToAskAbout);
            _return.Add(ParentGroup);
            if (IsTopLevelGroup(ParentGroup.ID))
            {
                TopLevelGroupFound = true;
            }
            IdToAskAbout = ParentGroup.ID;
        } while (!TopLevelGroupFound);
        return _return;
    }

}