From a9ecbca6522576ca3fe7222628734cacf3112e12 Mon Sep 17 00:00:00 2001
From: hikari <hikarin522@outlook.jp>
Date: Thu, 9 Dec 2021 12:48:16 +0900
Subject: [PATCH 1/2] Match the behavior of SystemRandomSource to System.Random

Match the behavior of "SystemRandomSource" to "System.Random"
https://github.com/dotnet/runtime/pull/47085
---
 src/Numerics/Random/SystemRandomSource.cs | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/Numerics/Random/SystemRandomSource.cs b/src/Numerics/Random/SystemRandomSource.cs
index 8ecefc43d..72e4d096d 100644
--- a/src/Numerics/Random/SystemRandomSource.cs
+++ b/src/Numerics/Random/SystemRandomSource.cs
@@ -49,16 +49,18 @@ public class SystemRandomSource : RandomSource
         /// <summary>
         /// Construct a new random number generator with a random seed.
         /// </summary>
-        public SystemRandomSource() : this(RandomSeed.Robust())
+        public SystemRandomSource()
         {
+            _random = new System.Random();
         }
 
         /// <summary>
         /// Construct a new random number generator with random seed.
         /// </summary>
         /// <param name="threadSafe">if set to <c>true</c> , the class is thread safe.</param>
-        public SystemRandomSource(bool threadSafe) : this(RandomSeed.Robust(), threadSafe)
+        public SystemRandomSource(bool threadSafe) : base(threadSafe)
         {
+            _random = new System.Random();
         }
 
         /// <summary>
@@ -80,7 +82,7 @@ public SystemRandomSource(int seed, bool threadSafe) : base(threadSafe)
             _random = new System.Random(seed);
         }
 
-        static readonly ThreadLocal<SystemRandomSource> DefaultInstance = new ThreadLocal<SystemRandomSource>(() => new SystemRandomSource(RandomSeed.Robust(), true));
+        static readonly ThreadLocal<SystemRandomSource> DefaultInstance = new ThreadLocal<SystemRandomSource>(() => new SystemRandomSource(true));
 
         /// <summary>
         /// Default instance, thread-safe.

From e293cc3f8edd1fccabeece94e07250cff50c8d22 Mon Sep 17 00:00:00 2001
From: hikari <hikarin522@outlook.jp>
Date: Thu, 9 Dec 2021 19:20:41 +0900
Subject: [PATCH 2/2] Update SystemRandomSource.cs

Fixed a seed value issue in the .NET Framework.
---
 src/Numerics/Random/SystemRandomSource.cs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/Numerics/Random/SystemRandomSource.cs b/src/Numerics/Random/SystemRandomSource.cs
index 72e4d096d..a0fd10383 100644
--- a/src/Numerics/Random/SystemRandomSource.cs
+++ b/src/Numerics/Random/SystemRandomSource.cs
@@ -51,7 +51,11 @@ public class SystemRandomSource : RandomSource
         /// </summary>
         public SystemRandomSource()
         {
+#if NETCOREAPP
             _random = new System.Random();
+#else
+            _random = new System.Random(RandomSeed.Robust());
+#endif
         }
 
         /// <summary>
@@ -60,7 +64,11 @@ public SystemRandomSource()
         /// <param name="threadSafe">if set to <c>true</c> , the class is thread safe.</param>
         public SystemRandomSource(bool threadSafe) : base(threadSafe)
         {
+#if NETCOREAPP
             _random = new System.Random();
+#else
+            _random = new System.Random(RandomSeed.Robust());
+#endif
         }
 
         /// <summary>