ShowDialogCommand

Generate a DelegateCommand that calls IDialogService.ShowDialog. The ViewModel must already expose an accessible IDialogService instance.

using Prism.Dialogs; // Prism 9+
// using Prism.Services.Dialogs; // Prism 8
using Prism.Mvvm;
using Prism.SourceGenerators;

public partial class MainViewModel : BindableBase
{
    private readonly IDialogService _dialogService;

    public MainViewModel(IDialogService dialogService) => _dialogService = dialogService;

    [ShowDialogCommand(Name = "ConfirmDelete")]
    private void ConfirmDelete() { }

    partial void OnConfirmDeleteDialogClosed(IDialogResult result)
    {
        // Optional callback after the dialog closes.
    }
}

Optional attribute properties: CommandName, DialogServiceMember.

Prism 8 vs Prism 9 dialogs

Prism	Dialog API namespace
9+	Prism.Dialogs (Prism.Core); RequestClose is a DialogCloseListener property
8	Prism.Services.Dialogs (platform assembly); RequestClose is an event

[DialogAware] and [ShowDialogCommand] resolve the namespace from referenced assemblies.

Diagnostics

ID	When
PSG7101	No accessible IDialogService member
PSG7102	[ShowDialogCommand] missing Name

Related

• DialogAware
• Container registration — [RegisterDialog]