How do you use reflection to access properties of Window
objects?
Here's a minimal example:
.xaml
file:
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow">
<TextBox x:Name="Textbox" Text=""/>
</Window>
code behind file:
public class A
{
public int Prop { get; set; }
}
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.Test.Text = "blah";
PropertyInfo p1 = this.GetType().GetProperty("Textbox");
PropertyInfo p2 = new A().GetType().GetProperty("Prop");
}
}
p1
is null
(p2
isn't as expected). Why is it so? Is the Window
type some kind of a special object
? Or is it because the type of Textbox
is generated as an internal
field?
#line 5 "..\..\MainWindow.xaml"
[System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1823:AvoidUnusedPrivateFields")]
internal System.Windows.Controls.TextBox Textbox;
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All named elements become internal fields, after XAML is compiled. This:
<TextBox x:Name="Textbox" Text=""/>
ultimately transforms to this:
internal TextBox TextBox;
Hence, to obtain metadata you have to call GetField
this way:
GetType().GetField("NameInXaml", BindingFlags.Instance | BindingFlags.NonPublic);
As you found out yourself, Textbox
is a field, not a property. In addition, it is not public, so you should try the following:
FieldInfo f1 = this.GetType().GetField("Textbox", BindingFlags.NonPublic | BindingFlags.Instance);
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