From 8f712c66c80f0657008db1b200c0d3b9a0571b2e Mon Sep 17 00:00:00 2001
From: Jonas Schmied <jonas.schmied@outlook.com>
Date: Wed, 18 Jun 2025 11:35:10 +0200
Subject: [PATCH] Do not validate non-required parameters being non-null but
 use only if provided

---
 src/NSwag.CodeGeneration.CSharp/Templates/Client.Class.liquid | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/NSwag.CodeGeneration.CSharp/Templates/Client.Class.liquid b/src/NSwag.CodeGeneration.CSharp/Templates/Client.Class.liquid
index 624f80a16..472bdbc46 100644
--- a/src/NSwag.CodeGeneration.CSharp/Templates/Client.Class.liquid
+++ b/src/NSwag.CodeGeneration.CSharp/Templates/Client.Class.liquid
@@ -249,10 +249,12 @@
 {%                 for parameter in operation.FormParameters %}
 {%                     if parameter.IsNullable -%}
                 if ({{ parameter.VariableName }} != null)
-{%                     else -%}
+{%                     elsif parameter.IsRequired -%}
                 if ({{ parameter.VariableName }} == null)
                     throw new System.ArgumentNullException("{{ parameter.VariableName }}");
                 else
+{%                     else -%}
+				if ({{ parameter.VariableName }} != null)
 {%                     endif -%}
                 {
 {%                     if parameter.IsFile -%}