diff --git a/fusionauth-netcore-client/src/io/fusionauth/DefaultRESTClient.cs b/fusionauth-netcore-client/src/io/fusionauth/DefaultRESTClient.cs
index f8f23959..fd68be22 100644
--- a/fusionauth-netcore-client/src/io/fusionauth/DefaultRESTClient.cs
+++ b/fusionauth-netcore-client/src/io/fusionauth/DefaultRESTClient.cs
@@ -36,7 +36,7 @@ class DefaultRESTClient : IRESTClient {
 
     public String uri = "";
 
-    public Dictionary<string, string> parameters = new Dictionary<string, string>();
+    public List<KeyValuePair<string, string>> parameters = new List<KeyValuePair<string, string>>();
 
     public Dictionary<string, string> headers = new Dictionary<string, string>();
 
@@ -146,7 +146,7 @@ public override IRESTClient withUri(string uri) {
      * @param value The value of the parameter, may be a string, object or number.
      */
     public override IRESTClient withParameter(string name, string value) {
-      parameters[name] = value;
+      parameters.Add(new KeyValuePair<string, string>(name, value));
       return this;
     }
 
diff --git a/fusionauth-netcore-client/src/io/fusionauth/IRESTClient.cs b/fusionauth-netcore-client/src/io/fusionauth/IRESTClient.cs
index 32d6aa15..cc56e22a 100644
--- a/fusionauth-netcore-client/src/io/fusionauth/IRESTClient.cs
+++ b/fusionauth-netcore-client/src/io/fusionauth/IRESTClient.cs
@@ -15,6 +15,8 @@
  */
 
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Net.Http;
 using System.Threading.Tasks;
 
@@ -101,6 +103,14 @@ public IRESTClient withParameter(string name, object value) {
       return withParameter(name, value.ToString());
     }
 
+    public IRESTClient withParameter<T>(string name, IEnumerable<T> value)
+    {
+        if (value == null)
+            return this;
+
+        return value.Aggregate(this, (current, val) => current.withParameter(name, val));
+    }
+    
     /**
      * Run the request and return a promise. This promise will resolve if the request is successful
      * and reject otherwise.