Add vb code;person example (#1052)

2026-09-04 09:06:04 +02:00 · 2021-04-30 13:05:52 -07:00
parent 4adbe51408
commit c893946fa6
12 changed files with 144 additions and 3 deletions
@@ -55,6 +55,7 @@ For more information about the different terms, see [XAML Syntax In Detail (.NET
 Another way to specify a binding is to set properties directly on a <xref:System.Windows.Data.Binding> object in code, and then assign the binding to a property. The following example shows how to create a <xref:System.Windows.Data.Binding> object in code.

 :::code language="csharp" source="./snippets/binding-declarations-overview/csharp/DataBindingCode.xaml.cs" id="SetBinding":::
+:::code language="vb" source="./snippets/binding-declarations-overview/vb/DataBindingCode.xaml.vb" id="SetBinding":::

 The previous code set the following on the binding:

@@ -65,6 +66,11 @@ The previous code set the following on the binding:

 When the object you're binding is a <xref:System.Windows.FrameworkElement> or a <xref:System.Windows.FrameworkContentElement>, you can call the `SetBinding` method on your object directly instead of using <xref:System.Windows.Data.BindingOperations.SetBinding%2A?displayProperty=nameWithType>. For an example, see [How to: Create a Binding in Code](../../../framework/wpf/data/how-to-create-a-binding-in-code.md).

+The previous example uses a simple data object type of `Person`. The following is the code for that object:
+
+:::code language="csharp" source="./snippets/binding-declarations-overview/csharp/Person.cs" id="Person":::
+:::code language="vb" source="./snippets/binding-declarations-overview/vb/Person.vb" id="Person":::
+
 ## Binding path syntax

 Use the <xref:System.Windows.Data.Binding.Path%2A> property to specify the source value you want to bind to:
@@ -23,9 +23,9 @@ namespace ArticleExample
        // <Converter>
        private class NameConverter : IValueConverter
        {
-            private static NameConverter _instance;
-            public static NameConverter Instance => //_instance ??= new NameConverter();
-                                                    _instance ?? (_instance = new NameConverter());
+            private static NameConverter _instance = new();
+
+            public static NameConverter Instance => _instance;

            public object Convert(object value, Type targetType, object parameter, CultureInfo culture) =>
                $"[[ {value} ]]";
@@ -2,9 +2,11 @@

 namespace ArticleExample
 {
+    //<Person>
    class Person
    {
        public string Name { get; set; }
        public DateTime Birthdate { get; set; }
    }
+    //</Person>
 }
@@ -0,0 +1,9 @@
+<Application x:Class="Application"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:ArticleExampleVB"
+             StartupUri="DataBindingCode.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>
@@ -0,0 +1,6 @@
+Class Application
+
+    ' Application-level events, such as Startup, Exit, and DispatcherUnhandledException
+    ' can be handled in this file.
+
+End Class
@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net5.0-windows</TargetFramework>
+    <RootNamespace>ArticleExampleVB</RootNamespace>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Import Include="System.Windows" />
+    <Import Include="System.Windows.Controls" />
+    <Import Include="System.Windows.Data" />
+    <Import Include="System.Windows.Documents" />
+    <Import Include="System.Windows.Input" />
+    <Import Include="System.Windows.Media" />
+    <Import Include="System.Windows.Media.Imaging" />
+    <Import Include="System.Windows.Navigation" />
+    <Import Include="System.Windows.Shapes" />
+  </ItemGroup>
+
+</Project>
@@ -0,0 +1,11 @@
+Imports System.Windows
+
+'The ThemeInfo attribute describes where any theme specific and generic resource dictionaries can be found.
+'1st parameter: where theme specific resource dictionaries are located
+'(used if a resource is not found in the page,
+' or application resource dictionaries)
+
+'2nd parameter: where the generic resource dictionary is located
+'(used if a resource is not found in the page,
+'app, and any theme specific resource dictionaries)
+<Assembly: ThemeInfo(ResourceDictionaryLocation.None, ResourceDictionaryLocation.SourceAssembly)>
@@ -0,0 +1,16 @@
+<Window x:Class="DataBindingCode"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:ArticleExampleVB"
+        mc:Ignorable="d"
+        Title="DataBindingCode" Height="450" Width="800"
+        Loaded="Window_Loaded">
+    <Border>
+        <StackPanel Width="300" Margin="35">
+            <Label>Person name:</Label>
+            <TextBlock x:Name="NameBlock" Margin="10,0,0,0" />
+        </StackPanel>
+    </Border>
+</Window>
@@ -0,0 +1,46 @@
+Imports System.Globalization
+
+Public Class DataBindingCode
+
+    '<Converter>
+    Private Class NameConverter
+        Implements IValueConverter
+
+        Private Shared _instance As New NameConverter
+
+        Public Shared ReadOnly Instance As NameConverter = _instance
+
+        Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.Convert
+            Return $"[[ {value} ]]"
+        End Function
+
+        Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.ConvertBack
+            Return value.ToString().Trim("[", "]", " ")
+        End Function
+    End Class
+    '</Converter>
+
+    '<SetBinding>
+    Private Sub Window_Loaded(sender As Object, e As RoutedEventArgs)
+
+        ' Make a new data source object
+        Dim personDetails As New Person() With {
+            .Name = "John",
+            .Birthdate = Date.Parse("2001-02-03")
+        }
+
+        ' New binding object using the path of 'Name' for whatever source object is used
+        Dim nameBindingObject As New Binding("Name")
+
+        ' Configure the binding
+        nameBindingObject.Mode = BindingMode.OneWay
+        nameBindingObject.Source = personDetails
+        nameBindingObject.Converter = NameConverter.Instance
+        nameBindingObject.ConverterCulture = New CultureInfo("en-US")
+
+        ' Set the binding to a target object. The TextBlock.Name property on the NameBlock UI element
+        BindingOperations.SetBinding(NameBlock, TextBlock.TextProperty, nameBindingObject)
+
+    End Sub
+    '</SetBinding>
+End Class
@@ -0,0 +1,12 @@
+<Window x:Class="MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:ArticleExampleVB"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Grid>
+
+    </Grid>
+</Window>
@@ -0,0 +1,3 @@
+Class MainWindow 
+
+End Class
@@ -0,0 +1,8 @@
+'<Person>
+Public Class Person
+
+    Public Property Name As String
+    Public Property Birthdate As DateTime
+    
+End Class
+'</Person>