Answers

• LeonLu Member, Xamarin Team Xamurai

  June 2020 Accepted Answer

  You can achieve it by DataTemplateSelector, for example, I create a two DataTemplate like following code.

   <ContentPage.Resources>
          <ResourceDictionary>
              <DataTemplate x:Key="NormalTweetTemplate">
                  <TextCell Text="{Binding  Name}"></TextCell>
              </DataTemplate>
              <DataTemplate x:Key="PromotedTweetTemplate">
                  <TextCell Text="{Binding  Age}"></TextCell>
              </DataTemplate>
              <local:MyTemplateSelector x:Key="TweetTemplateSelector"
                                        NormalTweetTemplate="{StaticResource NormalTweetTemplate}"
                                        PromotedTweetTemplate="{StaticResource PromotedTweetTemplate}"
                               />
          </ResourceDictionary>
      </ContentPage.Resources>
  

  if I changed have a property called IsSwitch If it value of IsSwitch is false, set PromotedTweetTemplate, If it value of IsSwitch is true, set NormalTweetTemplate . Create a DataTemplateSelector to acheve it.

     public class MyTemplateSelector : DataTemplateSelector
      {
           public DataTemplate NormalTweetTemplate { get; set; }
  
          public DataTemplate PromotedTweetTemplate { get; set; }
  
          protected override DataTemplate OnSelectTemplate(object item, BindableObject container)
          {
              if (((MyModel)item).IsSwitch is true)
                  return NormalTweetTemplate;
  
              if (((MyModel)item).IsSwitch is false)
                  return PromotedTweetTemplate;
  
              return NormalTweetTemplate;
  
          }
  
      }
  }
  

  Listview used it DataTemplateSelector like following code.

   <ListView ItemsSource="{Binding MyModels}"
            ItemTemplate="{StaticResource TweetTemplateSelector}" />
  

  MyModel have tree property like following code.

   public class MyModel:INotifyPropertyChanged
   {
          public string Name { get; set; }
          public string Age { get; set; }
  
          public bool IsSwitch { get; set; }
    }
  

  If the IsSwitch is true , TextCell binding Name, IsSwitch is false, TextCell binding Age like following screenshot.

  

  Here is helpful article about it.

  https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/templates/data-templates/selector

  1
• Yusuf_A Member ✭✭

  June 2020

  Thank you very much for the answer

  0