XamlParseException Error in GroupedItemsPage code-behind

Question

Hi,

For my app, users are supposed to login according to their respective dept. So, when a user login and there's nothing available for that dept, a message will be displayed in the GroupedItemsPage indicating that nothing is available at the moment. The displaying of the items is based on a count. If its more than 0, the gridview will display the groups. 

The code below is written in the LoadState of the GroupedItemsPage:

if (count > 0)
{
     // TODO: Assign a collection of bindable groups to this.DefaultViewModel["Groups"]
     var sampleDataGroups = VMDataSource.GetGroups((String)navigationParameter);
     this.DefaultViewModel["Groups"] = sampleDataGroups;
}

else
{
     StringBuilder sb = new StringBuilder();
     sb.Append("<DataTemplate xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\">");
     sb.Append("<Grid>");
     sb.Append("<StackPanel>");
     sb.Append("<TextBlock Text=\"There is nothing available currently.\" HorizontalAlignment=\"Center\" VerticalAlignment=\"Center\" Style=\"{StaticResource AppBodyTextStyle}\" />");
     sb.Append("</Grid>");
     sb.Append("</DataTemplate>");

     DataTemplate datatemplate = (DataTemplate)XamlReader.Load(sb.ToString());
     this.itemGridView.ItemTemplate = datatemplate;
     this.itemListView.ItemTemplate = datatemplate;
}

I'm getting error Window.UI.Xaml.Markup.XamlParseException at the following line:

DataTemplate datatemplate = (DataTemplate)XamlReader.Load(sb.ToString());

Can anyone point where I went wrong?

Thanks.

Answer 1

If you output the string to a textblock, and then copy/paste it into a XAML page, does the XAML parse properly?

---

Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.

Answer 2

Hi Matt,

Thanks for your reply.

I've made a little mistake by not closing the stack panel tag. Now I can parse it properly its just that it doesn't appear anything when I run the project. The text does not appear. Is it due to the grid app template that already has a binding to its items source and the declaration of the item template? 

I declare it as the itemGridView item template but nothing was displayed. There's no error now when I run. It just doesn't display anything.

Thanks.

Answer 3

Hi,

Can anyone help me out? I'm in need of assistance to overcome the problem that I encountered. When I run the app, there's no error but the message doesn't get displayed.

Thanks.

Answer 4

OK - if you have no data to display, the GridView/ListView won't loop through the datatemplate.  If the count is 0, assign the datatemplate, then create a temp list with 1 item in it and set that as the ItemsSource.

---

Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.

Answer 5

Hi Matt,

Do you have any links of a sample that I can refer to? 

Thanks.

Answer 6

var NewList = new List<string>();
NewList.Add("dummy string");
this.itemGridView.ItemsSource = NewList;
this.itemListView.ItemsSource = NewList;

---

Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.