From d074ea769476cfe6af3c418fbc3c61214d186334 Mon Sep 17 00:00:00 2001
From: Curt Hagenlocher <curt@hagenlocher.org>
Date: Mon, 16 Oct 2023 14:50:53 -0700
Subject: [PATCH] Fix build for .NET 4.7.2

---
 csharp/test/Apache.Arrow.Tests/DurationArrayTests.cs | 4 ++++
 csharp/test/Apache.Arrow.Tests/MapArrayTests.cs      | 6 +++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/csharp/test/Apache.Arrow.Tests/DurationArrayTests.cs b/csharp/test/Apache.Arrow.Tests/DurationArrayTests.cs
index 0890d356b8e90..3395ca7bc9ad7 100644
--- a/csharp/test/Apache.Arrow.Tests/DurationArrayTests.cs
+++ b/csharp/test/Apache.Arrow.Tests/DurationArrayTests.cs
@@ -69,7 +69,11 @@ static TimeUnit RequiredPrecision(TimeSpan? timeSpan)
         {
             if (timeSpan == null) { return TimeUnit.Second; }
             if ((timeSpan.Value.Ticks % TicksPerMicrosecond) > 0) { return TimeUnit.Nanosecond; }
+#if NET5_0_OR_GREATER
             if (timeSpan.Value.Microseconds > 0) { return TimeUnit.Microsecond; }
+#else
+            if ((timeSpan.Value.Ticks % (TicksPerMicrosecond * 1000)) > 0) { return TimeUnit.Microsecond; }
+#endif
             if (timeSpan.Value.Milliseconds > 0) { return TimeUnit.Millisecond; }
             return TimeUnit.Second;
         }
diff --git a/csharp/test/Apache.Arrow.Tests/MapArrayTests.cs b/csharp/test/Apache.Arrow.Tests/MapArrayTests.cs
index 034f120f3f016..7f35f104267dc 100644
--- a/csharp/test/Apache.Arrow.Tests/MapArrayTests.cs
+++ b/csharp/test/Apache.Arrow.Tests/MapArrayTests.cs
@@ -62,9 +62,9 @@ public void MapArray_Should_GetKeyValuePairs()
             var keyBuilder = builder.KeyBuilder as StringArray.Builder;
             var valueBuilder = builder.ValueBuilder as Int32Array.Builder;
 
-            KeyValuePair<string, int?> kv0 = KeyValuePair.Create("test", (int?)1);
-            KeyValuePair<string, int?> kv1 = KeyValuePair.Create("other", (int?)123);
-            KeyValuePair<string, int?> kv2 = KeyValuePair.Create("kv", (int?)null);
+            KeyValuePair<string, int?> kv0 = new KeyValuePair<string, int?>("test", (int?)1);
+            KeyValuePair<string, int?> kv1 = new KeyValuePair<string, int?>("other", (int?)123);
+            KeyValuePair<string, int?> kv2 = new KeyValuePair<string, int?>("kv", (int?)null);
 
             builder.Append();
             keyBuilder.Append("test");