Two methods of implementing data type Conversions in XAML in WPF

Friends who are familiar with data binding know that when we get the data of an object in the model, we often need to convert it to the UI interface, for example, you store the gender of a person with a bool type, but the interface needs to be transformed and displayed as a male or female;

Today, the data binding part of the look again, here is a summary of it!

method One : When we define a class, which has a property of that class type, then if we just use simple data binding in XAML, the program will have a problem because the program does not correctly convert the properties of the class type of the class object. So we need to customize a transformation class that inherits TypeConverter and needs to rewrite a member function of the class ConvertFrom, and add a type conversion property for the class that needs to be converted, and finally use the static resource in XAML!

The sample code for the corresponding class is as follows:

    Human.cs

    [TypeConverterAttribute (typeof (Childconvertertohuman))]    public class Human    {public        string Name {get; set;}        Public Human Child {get; set;}    }    public class Childconvertertohuman:typeconverter    {public        override object ConvertFrom ( ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)        {            Human h = new Human ();            String str = value. ToString ();            H.name = str;            return h;        }    }

MainWindow. xaml    

    <window.resources >        <  x:key= "Human"  Name= "hippie" child= "Tom"/>    </ window.resources >

This allows us to correctly convert the data type of the child property of the human object;

this. FindResource ("human" as human; if NULL ) {     + hu. Child.name);}

method Two : The reason and method one is the same, still need to define a type conversion class, but need to inherit the class is the IValueConverter class, we need to rewrite the convert and Convertback functions (general rewrite convert can)

   Public classPerson { Public stringName {Get;Set; }  Public BOOLGender {Get;Set; } }     Public classConverter:ivalueconverter {/// <summary>        ///Model to UI/// </summary>        /// <param name= "value" ></param>        /// <param name= "TargetType" ></param>        /// <param name= "parameter" ></param>        /// <param name= "culture" ></param>        /// <returns></returns>         Public ObjectConvert (ObjectValue, Type TargetType,Objectparameter, System.Globalization.CultureInfo culture) {            BOOLGender = (BOOL) value; if(Gender = =true)            {                return "male"; }            Else            {                return "female"; }        }        /// <summary>        ///UI to Model/// </summary>        /// <param name= "value" ></param>        /// <param name= "TargetType" ></param>        /// <param name= "parameter" ></param>        /// <param name= "culture" ></param>        /// <returns></returns>         Public ObjectConvertback (ObjectValue, Type TargetType,Objectparameter, System.Globalization.CultureInfo culture) {            Throw Newnotimplementedexception (); }    }

    <window.resources>        <Local:converterx:key= "Converter"/>    </window.resources>    <Grid>        <StackPanel>            <StackPanelx:name= "SP"Orientation= "Horizontal">                <TextBlockText="{Binding Name}"FontSize= " the"Margin= "0,0,24,0"/>                <TextBlockText="{Binding Gender, Converter={staticresource Converter}}"FontSize= " the"/>            </StackPanel>        </StackPanel>    </Grid>

New Person {     "Tom",      false= p;

This way we can display the different data types through a certain transformation in the program Interface!

Two methods of implementing data type Conversions in XAML in WPF