Blade.Views.NullModelHelper.RenderNullModelMessage C# (CSharp) Method

        internal static void RenderNullModelMessage(HtmlTextWriter writer, string viewName, string dataSource, Type presenterType, Type modelType)
        {
            writer.AddAttribute("style", "border: 1px dashed red; padding: .5em;");
            writer.RenderBeginTag("div");

            writer.Write("<p><strong>Hidden View:</strong> {0}</p>", viewName);

            writer.Write("<p>View was automatically hidden because its model type <span style=\"font-family: monospace\">{0}</span> could not be resolved. Possible causes:</p>", modelType.Name);

            writer.RenderBeginTag("ul");

            if (!string.IsNullOrWhiteSpace(dataSource))
                writer.Write("<li>The view's data source value, <span style=\"font-family: monospace\">{0}</span>, may not point to valid item(s).</li>", dataSource);

            writer.Write("<li>The presenter, <span style=\"font-family: monospace\">{0}</span>, returned null for the model. This would usually indicate either the data source cannot be converted to the model type, or that no data exists to display.</li>", presenterType.Name);

            writer.RenderEndTag(); // ul

            writer.Write("<p><em>This message is only displayed in preview or edit mode, and will not appear to end users.</em></p>");

            writer.RenderEndTag(); // div
        }

 protected override void RenderWhenModelIsNull(System.Web.UI.HtmlTextWriter writer)
 {
     if (IsEditing || IsPreviewing)
     {
         NullModelHelper.RenderNullModelMessage(writer, ViewPath, DataSource, PresenterFactory.GetPresenter <TModel>().GetType(), typeof(TModel));
     }
 }