1. IList<string> FeildList = (from ListItem li in cblFeild.Items where li.Selected select li.Value).ToList();

            string[] UpperIDs = FeildList.ToArray<String>();

 

2.  <toolkit:WrapPanel Name="wrpContainer" >

 

 

 

  var checkedItems = wrpContainer.Children.OfType<CheckBox>().Where( c => c.IsChecked == true );

MessageBox.Show( string.Format( "有 {0}个选项已选择 " , checkedItems.Count().ToString() ) );