二重起動時に既存のStartupDialogを表示する - #655
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July 25, 2026 18:17
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概要
起動時のmutexチェックで既存インスタンスを検出した場合、エラーダイアログを表示する代わりに、既存プロセスの
StartupDialogを表示してアクティブ化します。変更内容
SetPropで付与したマーカーを使ってStartupDialogのHWNDを特定Show()を実行Activate()を実行Loaded前に復元要求を受信した場合も、読み込み完了後に表示NativeMethods.txtへ追加NO_MUTEXを定義し、複数プロセスでの確認を可能にする背景
WPFの
Hide()はネイティブのWS_VISIBLEだけでなく、WPF側の可視状態も変更します。そのため、2個目のプロセスからShowWindowだけを呼ぶと、ウィンドウ枠は復元されてもWPFコンテンツが描画されない状態になります。既存プロセスへ復元要求を通知し、そのプロセスのWPF UIスレッドで
Show()を呼ぶことで、ウィンドウとコンテンツを正しく再表示します。確認
dotnet build成功Fixes #618