make TrustIssuer an instance method

StackExchange.Redis.Tests/SSL.cs

@@ -190,7 +190,7 @@ public void RedisLabsSSL()
                 }, false)
             };
             
-            options.CertificateValidation += ConfigurationOptions.TrustIssuer("redislabs_ca.pem");
+            options.TrustIssuer("redislabs_ca.pem");
 
 
 

StackExchange.Redis/StackExchange/Redis/ConfigurationOptions.cs

@@ -179,13 +179,15 @@ public static string TryNormalize(string value)
         /// <summary>
         /// Create a certificate validation check that checks against the supplied issuer even if not known by the machine
         /// </summary>
-        public static RemoteCertificateValidationCallback TrustIssuer(string issuerCertificatePath)
-            => TrustIssuer(new X509Certificate2(issuerCertificatePath));
-
+        public void TrustIssuer(string issuerCertificatePath) => CertificateValidationCallback = TrustIssuerCallback(issuerCertificatePath);
         /// <summary>
         /// Create a certificate validation check that checks against the supplied issuer even if not known by the machine
         /// </summary>
-        public static RemoteCertificateValidationCallback TrustIssuer(X509Certificate2 issuer)
+        public void TrustIssuer(X509Certificate2 issuer) => CertificateValidationCallback = TrustIssuerCallback(issuer);
+
+        internal static RemoteCertificateValidationCallback TrustIssuerCallback(string issuerCertificatePath)
+            => TrustIssuerCallback(new X509Certificate2(issuerCertificatePath));
+        private static RemoteCertificateValidationCallback TrustIssuerCallback(X509Certificate2 issuer)
         {
             if (issuer == null) throw new ArgumentNullException(nameof(issuer));
 

StackExchange.Redis/StackExchange/Redis/PhysicalConnection.cs

@@ -949,7 +949,7 @@ private RemoteCertificateValidationCallback GetAmbientIssuerCertificateCallback(
             try
             {
                 var issuerPath = Environment.GetEnvironmentVariable("SERedis_IssuerCertPath");
-                if (!string.IsNullOrEmpty(issuerPath)) return ConfigurationOptions.TrustIssuer(issuerPath);
+                if (!string.IsNullOrEmpty(issuerPath)) return ConfigurationOptions.TrustIssuerCallback(issuerPath);
             }
             catch (Exception ex)
             {