Custom value Converter

When we write pages on the front-end, sometimes the data provided to us by the backend is not ready for use. We need to convert the data for use. Therefore, we need to create a front-end Data Conversion Tool class

 Using  System;  Using  System. Collections. Generic;  Using  System. LINQ;  Using  System. text;  Using  System. Threading. tasks;  Using  Windows. UI. XAML;  Using  Windows. UI. XAML. Data; Namespace  Gridexp {  Public   Class  Boolvisibilityconverter: ivalueconverter {  Public   Object Convert ( Object Value, type targettype, Object Parameter, String  Language ){  //  Value is the data in the model, and the returned value is the data in the UI after conversion.              Bool B = ( Bool  ) Value;  Return B? Visibility. Visible: visibility. collapsed ;}  Public   Object Convertback ( Object Value, type targettype, Object Parameter, String  Language ){  //  Value is the value of the data type in the UI into the model (twoway binding) Visibility v =(Visibility) value;  Return V = Visibility. visible ;}}} 

REFERENCE The namespace of the class in the first tag.

 <  Common: layoutawarepage  X: Name  = "Pageroot"  X: Class  = "Gridexp. groupeditemspage"  Datacontext  ="  {Binding defaviewviewmodel, relativesource = {relativesource self }}  " Xmlns  = "Http://schemas.microsoft.com/winfx/2006/xaml/presentation"  Xmlns: x  = "Http://schemas.microsoft.com/winfx/2006/xaml"  Xmlns: Local= "Using: gridexp"  Xmlns: Data  = "Using: gridexp. Data"  Xmlns: Common  = "Using: gridexp. Common"  Xmlns: d  = "Http://schemas.microsoft.com/expression/blend/2008"  Xmlns: MC = "Http://schemas.openxmlformats.org/markup-compatibility/2006"  MC: ignorable  = "D"  > 

Set another resource, which is equivalent to a new object in this page.

<Page. Resources><! --The set of group items displayed on this page is bound to the subset of the full item list because the items in the virtualization group cannot be--><Local: boolvisibilityconverterX: Key= "Boovisconverter"> </Local: boolvisibilityconverter>
 

Finally, use

<ImageSource= "Images/w_mengchong.jpg"Visibility="{Binding isunmem, converter = {staticresource boovisconverter }}"Width= "50"Height= "50"> </Image>