33 lines
767 B
C#
33 lines
767 B
C#
using System.Windows;
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namespace ShrlAlgoToolkit.RevitAddins.Common.Assists;
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public sealed record SingletonViewAssist<T>
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where T : Window, new()
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{
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private static T _instance;
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private static readonly object Padlock = new();
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private SingletonViewAssist() { }
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public static T GetInstance(out bool isNewCreate)
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{
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isNewCreate = false;
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//double-check locking
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if (_instance == null)
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{
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isNewCreate = true;
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lock (Padlock)
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{
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_instance ??= new T();
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_instance.Closed += OnWindowClosed;
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}
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}
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return _instance;
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}
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private static void OnWindowClosed(object sender, EventArgs e)
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{
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_instance = null;
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}
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} |