Modify the data structure, do not inherit the MessageBase.

src/DotNetCore.CAP/Infrastructure/CapReceivedMessage.cs

-namespace DotNetCore.CAP.Infrastructure
+using System;
+
+namespace DotNetCore.CAP.Infrastructure
 {
-    public class CapReceivedMessage : CapMessage
+    public class CapReceivedMessage
     {
+        /// <summary>
+        /// Initializes a new instance of <see cref="CapReceivedMessage"/>.
+        /// </summary>
+        /// <remarks>
+        /// The Id property is initialized to from a new GUID string value.
+        /// </remarks>
         public CapReceivedMessage()
         {
+            Id = Guid.NewGuid().ToString();
+            Added = DateTime.Now;
+        }
+
+        public CapReceivedMessage(MessageContext message) : this()
+        {
+            Group = message.Group;
+            KeyName = message.KeyName;
+            Content = message.Content;
         }
 
-        public CapReceivedMessage(MessageBase baseMessage)
-            : base(baseMessage)
+        public string Id { get; set; }
+
+        public string Group { get; set; }
+
+        public string KeyName { get; set; }
+
+        public string Content { get; set; }
+
+        public DateTime Added { get; set; }
+
+        public DateTime LastRun { get; set; }
+
+        public int Retries { get; set; }
+
+        public string StatusName { get; set; }
+
+        public MessageContext ToMessageContext()
         {
+            return new MessageContext
+            {
+                Group = Group,
+                KeyName = KeyName,
+                Content = Content
+            };
         }
     }
 }
\ No newline at end of file

src/DotNetCore.CAP/Infrastructure/CapSentMessage.cs

-namespace DotNetCore.CAP.Infrastructure
+using System;
+
+namespace DotNetCore.CAP.Infrastructure
 {
-    public class CapSentMessage : CapMessage
+    public class CapSentMessage 
     {
+        /// <summary>
+        /// Initializes a new instance of <see cref="CapSentMessage"/>.
+        /// </summary>
+        /// <remarks>
+        /// The Id property is initialized to from a new GUID string value.
+        /// </remarks>
+        public CapSentMessage()
+        {
+            Id = Guid.NewGuid().ToString();
+            Added = DateTime.Now;
+        }
+
+        public CapSentMessage(MessageContext message)
+        {
+            KeyName = message.KeyName;
+            Content = message.Content;
+        }
+
+        public string Id { get; set; } 
+
+        public string KeyName { get; set; }
+
+        public string Content { get; set; }
+
+        public DateTime Added { get; set; }
+
+        public DateTime LastRun { get; set; }
+
+        public int Retries { get; set; }
+
+        public string StatusName { get; set; }
     }
 }
\ No newline at end of file

src/DotNetCore.CAP/Infrastructure/CapMessage.cs → src/DotNetCore.CAP/Infrastructure/StatusName.cs

 using System;
+using System.Collections.Generic;
+using System.Text;
 
 namespace DotNetCore.CAP.Infrastructure
 {
-    /// <summary>
-    /// cap messages store model.
-    /// </summary>
-    public abstract class CapMessage : MessageBase
-    {
-        /// <summary>
-        /// Initializes a new instance of <see cref="CapMessage"/>.
-        /// </summary>
-        /// <remarks>
-        /// The Id property is initialized to from a new GUID string value.
-        /// </remarks>
-        protected CapMessage()
-        {
-            Id = Guid.NewGuid().ToString();
-            Added = DateTime.Now;
-        }
-
-        protected CapMessage(MessageBase message)
-        {
-            KeyName = message.KeyName;
-            Content = message.Content;
-        }
-
-        public string Id { get; set; }
-
-        public DateTime Added { get; set; }
-
-        public DateTime LastRun { get; set; }
-
-        public int Retries { get; set; }
-
-        public string StatusName { get; set; }
-    }
-
     /// <summary>
     /// The message status name.
     /// </summary>
@@ -46,4 +14,4 @@ namespace DotNetCore.CAP.Infrastructure
         public const string Succeeded = nameof(Succeeded);
         public const string Failed = nameof(Failed);
     }
-}
\ No newline at end of file
+}