Original WPF Resource binding Custom collection class.

A brief introduction to the WPF resource dictionary:

Each WPF interface element has a property named resource, which inherits to the FrameworkElement class, which is of type ResourceDictionary. ResourceDictionary can store resources in the form of key-value pairs, which are used in the form of key-value pairs to obtain resource objects when a resource is to be used. When you save a resource, the ResourceDictionary resource object is an object type, so when you use the resource to type-convert the resource object, the XAML compiler can automatically identify the resource type based on attribute, and throws an exception if the type is not correct.

If the resource dictionary stores a collection type, and the application only wants to bind one of the elements, you will need to write your own converter to return the desired element value.

The following shows an example of an element in a binding collection:

First define the contents of the collection:

1<resourcedictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"2xmlns:sys="Clr-namespace:system;assembly=mscorlib"3xmlns:syscollection="Clr-namespace:system.collections;assembly=mscorlib"4xmlns:x="Http://schemas.microsoft.com/winfx/2006/xaml">5<!--login screen--6<syscollection:arraylist x:key="Page_login">7<syscollection:dictionaryentry key="title"Value="system"/>8<syscollection:dictionaryentry key="Login"Value="Login"/>9<!--Tips-Ten<syscollection:dictionaryentry key="User_isnull"Value="the user cannot be empty"/> One<syscollection:dictionaryentry key="Password_isnull"Value="The password cannot be empty"/> A<syscollection:dictionaryentry key="user_noexist"Value="user does not exist"/> -<syscollection:dictionaryentry key="Password_error"Value="Password Error"/> -</syscollection:ArrayList> the  -</ResourceDictionary>

Next, define the converter:

1 classCultureconverter:ivalueconverter2     {3          Public ObjectConvert (ObjectValue, Type TargetType,Objectparameter, System.Globalization.CultureInfo culture)4         {5             if(Value = =NULL)return NULL;6ArrayList LST = value asArrayList;7             if(LST = =NULL)return NULL;8dictionary<Object,Object> dic = lst. Cast<dictionaryentry> (). ToDictionary (item = Item). Key, item =item. Value);9             if(DIC. ContainsKey (parameter))Ten                 returnDic[parameter]; One             Else A                 return NULL; -         } -  the          Public ObjectConvertback (ObjectValue, Type TargetType,Objectparameter, System.Globalization.CultureInfo culture) -         { -             Throw Newnotimplementedexception (); -         } +}

Finally, reference the resource in XAML:

1<!--define the converter resource--2<Window.Resources>3<local:cultureconverter x:key="Cultureconverter"/>4</Window.Resources>5<!--referencing resources in XAML--6<label content="{Binding Converter={staticresource cultureconverter}, Converterparameter=title,source={staticresource Page_ Login}}"grid.row="1"Verticalalignment="Top"Fontsize=" $"fontweight="Bold"padding="0"grid.columnspan="2"Horizontalcontentalignment="Center"/>

Note: You cannot refer to DynamicResource in converter and source.

Application resource converters can flexibly implement resource references, especially grouped resources. A very good case: the application of internationalization.

Original WPF Resource binding Custom collection class.