From ed39b8e847f91f82ecbad62d08217486ce13ed1d Mon Sep 17 00:00:00 2001
From: ig <ig ig@devnullmail.com>
Date: Thu, 17 Aug 2023 08:01:16 +0200
Subject: [PATCH] Fix Index out of range in .ToDisplayString()

---
 csharp/Lib/Units/Unit.cs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/csharp/Lib/Units/Unit.cs b/csharp/Lib/Units/Unit.cs
index 5e5997191..efe0986f1 100644
--- a/csharp/Lib/Units/Unit.cs
+++ b/csharp/Lib/Units/Unit.cs
@@ -19,12 +19,12 @@ public abstract class Unit
 
         var i = 8;
 
-        while (a >= 10000)
+        while (a >= 10000 && i < MaxPrefix)
         {
             a /= 1000;
             i++;
         }
-        while (a < 10)
+        while (a < 10 && i > 0)
         {
             a *= 1000;
             i--;
@@ -38,5 +38,7 @@ public abstract class Unit
     }
 
     private static readonly IReadOnlyList<String> Prefix = new[] { "y", "z", "a", "f", "p", "n", "µ", "m", "", "k", "M", "G", "T", "P", "E", "Y" };
+
+    private static Int32 MaxPrefix { get; } = Prefix.Count - 1;
 }