@@ -36,6 +36,15 @@ public void CacheDoesNotInterfereBody()
       Assert.AreEqual("{\"first\":true}", firstParams.ToString(Formatting.None));
       Assert.AreEqual("{\"second\":false}", secondParams.ToString(Formatting.None));
     }
+
+    [Test]
+    public void EmptyListIsSkippedInQueryParams()
+    {
+      var first = new EmptyListExampleRequestModel();
+      Assert.AreEqual(new Dictionary<string, string> { }, first.BuildQueryParams());
+      first.List.Add("hello_world");
+      Assert.AreEqual(new Dictionary<string, string> { { "list", "hello_world" } }, first.BuildQueryParams());
+    }
   }
 
   public class FirstRequestModel : RequestParams
@@ -51,4 +60,10 @@ public class SecondRequestModel : RequestParams
     [QueryParam("second")]
     public bool? Second { get; set; }
   }
+
+  public class EmptyListExampleRequestModel : RequestParams
+  {
+    [QueryParam("list")]
+    public IList<string> List { get; set; } = new List<string>();
+  }
 }
@@ -97,10 +97,13 @@ private void AddQueryParam(Dictionary<string, string> queryParams, PropertyInfo
       object value = prop.GetValue(this);
       if (value != null)
       {
-        if (value is IList<string> list && list.Count > 0)
+        if (value is IList<string> list)
         {
-          var str = string.Join(",", list);
-          queryParams.Add(attribute.Key ?? prop.Name, str);
+          if (list.Count > 0)
+          {
+            var str = string.Join(",", list);
+            queryParams.Add(attribute.Key ?? prop.Name, str);
+          }
         }
         else if (value is bool valueAsBool)
         {
Original file line number	Diff line number	Diff line change
`@@ -97,10 +97,13 @@ private void AddQueryParam(Dictionary<string, string> queryParams, PropertyInfo`
`97`	`97`	`object value = prop.GetValue(this);`
`98`	`98`	`if (value != null)`
`99`	`99`	`{`
`100`		`- if (value is IList<string> list && list.Count > 0)`
	`100`	`+ if (value is IList<string> list)`
`101`	`101`	`{`
`102`		`- var str = string.Join(",", list);`
`103`		`- queryParams.Add(attribute.Key ?? prop.Name, str);`
	`102`	`+ if (list.Count > 0)`
	`103`	`+ {`
	`104`	`+ var str = string.Join(",", list);`
	`105`	`+ queryParams.Add(attribute.Key ?? prop.Name, str);`
	`106`	`+ }`
`104`	`107`	`}`
`105`	`108`	`else if (value is bool valueAsBool)`
`106`	`109`	`{`