From 431592110738aa93aca90e90c6ca17ee7a6d2ea0 Mon Sep 17 00:00:00 2001
From: ZQ Wang <271418+wangzq@users.noreply.github.com>
Date: Mon, 15 Apr 2024 12:22:14 -0700
Subject: [PATCH] Fix concurrency bug in AssemblyHelper (#407)

---
 .../Utility/AssemblyResolution/AssemblyHelper_Desktop.cs      | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/xunit.runner.visualstudio/Utility/AssemblyResolution/AssemblyHelper_Desktop.cs b/src/xunit.runner.visualstudio/Utility/AssemblyResolution/AssemblyHelper_Desktop.cs
index d3be0d9..7b50139 100644
--- a/src/xunit.runner.visualstudio/Utility/AssemblyResolution/AssemblyHelper_Desktop.cs
+++ b/src/xunit.runner.visualstudio/Utility/AssemblyResolution/AssemblyHelper_Desktop.cs
@@ -1,7 +1,7 @@
 #if NETFRAMEWORK
 
 using System;
-using System.Collections.Generic;
+using System.Collections.Concurrent;
 using System.IO;
 using System.Reflection;
 using Xunit.Abstractions;
@@ -19,7 +19,7 @@ class AssemblyHelper : LongLivedMarshalByRefObject, IDisposable
 
 	readonly string directory;
 	readonly IMessageSink? internalDiagnosticsMessageSink;
-	readonly Dictionary<string, Assembly?> lookupCache = new();
+	readonly ConcurrentDictionary<string, Assembly?> lookupCache = new();
 
 	/// <summary>
 	/// Constructs an instance using the given <paramref name="directory"/> for resolution.