Updated to use latest RestSharp. FromID is now being returned as SenderID, this makes sense to me but hasn't been updated on the MailJet API documentation!

Author: Ashley Medway

MailJet.Client.Tests/GetMessages.cs

@@ -97,7 +97,7 @@ public void GetMessagesFilterBySender_Test()
             Assert.IsNotNull(result);
             Assert.IsTrue(result.Data.Any());
             Assert.AreEqual(result.Count, result.Data.Count);
-            Assert.IsTrue(result.Data.All(x => x.FromID == 3));
+            Assert.IsTrue(result.Data.All(x => x.SenderID == 3));
         }
 
         [Test]

MailJetClient/MailJet.Client.csproj

@@ -28,8 +28,9 @@
     <ConsolePause>false</ConsolePause>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="RestSharp">
-      <HintPath>..\packages\RestSharp.105.1.0\lib\net45\RestSharp.dll</HintPath>
+    <Reference Include="RestSharp, Version=105.2.3.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\RestSharp.105.2.3\lib\net45\RestSharp.dll</HintPath>
+      <Private>True</Private>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Net" />

MailJetClient/MailJetClient.cs

@@ -6,6 +6,7 @@
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using RestSharp;
+using RestSharp.Authenticators;
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -243,7 +244,13 @@ public Response<DataItem> SendMessage(MailMessage Message)
                     throw new InvalidOperationException("Attachments cannot exceed 15MB. http://dev.mailjet.com/guides/send-api-guide/");
 
                 foreach (var item in Message.Attachments)
-                    request.AddFile("attachment", x => item.ContentStream.CopyTo(x), item.Name);
+                {
+                    using (MemoryStream ms = new MemoryStream())
+                    {
+                        item.ContentStream.CopyTo(ms);
+                        request.AddFile("attachment", ms.ToArray(), item.Name);
+                    }
+                }
             }
 
             var view = Message.AlternateViews.FirstOrDefault();

MailJetClient/Response/Data/MessageData.cs

@@ -13,7 +13,7 @@ public class MessageData : DataItem
         public long Delay { get; set; }
         public int DestinationID { get; set; }
         public int FilterTime { get; set; }
-        public long FromID { get; set; }
+        public long SenderID { get; set; }
         public bool IsClickTracked { get; set; }
         public bool IsHtmlPartIncluded { get; set; }
         public bool IsOpenTracked { get; set; }

MailJetClient/packages.config

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Newtonsoft.Json" version="6.0.8" targetFramework="net45" />
-  <package id="RestSharp" version="105.1.0" targetFramework="net45" />
+  <package id="RestSharp" version="105.2.3" targetFramework="net45" />
 </packages>