From 461562c49ea6c18733ae978f3a48ee53571ce67d Mon Sep 17 00:00:00 2001
From: Ted Spence <ted@spence.net>
Date: Mon, 5 Aug 2024 15:20:54 -0700
Subject: [PATCH] Fix usage of linq for older versions of dotnet

---
 src/CSV.cs | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/CSV.cs b/src/CSV.cs
index 755ce11..8b014f7 100644
--- a/src/CSV.cs
+++ b/src/CSV.cs
@@ -7,7 +7,6 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
-using System.Linq;
 using System.Text;
 #if HAS_ASYNC
 using System.Threading.Tasks;
@@ -360,11 +359,24 @@ internal static string ItemsToCsv(IEnumerable items, CSVSettings settings, char[
                 // Special cases for other types of serialization
                 string s;
                 var itemType = item.GetType();
+                var interfaces = itemType.GetInterfaces();
+                bool isEnumerable = false;
+                if (itemType != typeof(string))
+                {
+                    foreach (var itemInterface in interfaces)
+                    {
+                        if (itemInterface == typeof(IEnumerable))
+                        {
+                            isEnumerable = true;
+                        }
+                    }
+                }
+
                 if (item is DateTime)
                 {
                     s = ((DateTime)item).ToString(settings.DateTimeFormat);
                 }
-                else if (itemType != typeof(string) && itemType.GetInterfaces().Contains(typeof(IEnumerable)))
+                else if (isEnumerable)
                 {
                     IEnumerable enumerable = item as IEnumerable;
                     s = string.Empty;