DialogAware

Apply [DialogAware] to a partial class inheriting BindableBase when a dialog contract is available:

Prism	Namespace	RequestClose shape
9+	Prism.Dialogs	DialogCloseListener property — call RequestClose.Invoke(ButtonResult.OK)
8	Prism.Services.Dialogs	event Action<IDialogResult> — call RequestClose?.Invoke(new DialogResult(...))

On Prism 9, Title is omitted when IDialogAware has no title member (set title on the view/window instead).

Usage (Prism 9)

using Prism.Dialogs;
using Prism.Mvvm;
using Prism.SourceGenerators;

[DialogAware(Title = "Confirm")]
public partial class ConfirmViewModel : BindableBase
{
    [DelegateCommand]
    private void Ok() => RequestClose.Invoke(ButtonResult.OK);

    partial void OnDialogOpenedCore(IDialogParameters parameters) { }
}

Generated members

• Title when the contract exposes it (Prism 8)
• RequestClose (event or DialogCloseListener, depending on Prism version)
• CanCloseDialog → CanCloseDialogCore (default true)
• OnDialogOpened / OnDialogClosed → partial cores

[FromDialogParameter]

Apply [FromDialogParameter] to an [ObservableProperty] field or partial property to read a typed value from IDialogParameters via TryGetValue<T> and assign it through the property setter before OnDialogOpenedCore is invoked.

[DialogAware(Title = "Confirm")]
public partial class ConfirmViewModel : BindableBase
{
    [FromDialogParameter("message")]
    [ObservableProperty]
    public partial string Message { get; set; } = "Default";
}

If the parameter is absent, the property retains its initial value. The key defaults to the property name when not specified.

Diagnostics

ID	When
PSG0008	Class is not partial
PSG7103	Attribute applied to a non-field/property member
PSG7104	Member lacks [ObservableProperty]
PSG7105	Key is empty

Related

• ShowDialogCommand
• Container registration — [RegisterDialog]