fix bug #44

.gitignore

@@ -35,3 +35,7 @@ bin/
 /.idea
 Properties
 /pack.bat
+/src/DotNetCore.CAP/project.json
+/src/DotNetCore.CAP/packages.config
+/src/DotNetCore.CAP/DotNetCore.CAP.Net47.csproj
+/NuGet.config

samples/Sample.RabbitMQ.SqlServer/Program.cs

 using System.IO;
+using Microsoft.AspNetCore;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Configuration;
@@ -7,22 +8,30 @@ namespace Sample.RabbitMQ.SqlServer
 {
     public class Program
     {
+
+        //var config = new ConfigurationBuilder()
+        //    .AddCommandLine(args)
+        //    .AddEnvironmentVariables("ASPNETCORE_")
+        //    .Build();
+
+        //var host = new WebHostBuilder()
+        //    .UseConfiguration(config)
+        //    .UseKestrel()
+        //    .UseContentRoot(Directory.GetCurrentDirectory())
+        //    .UseIISIntegration()
+        //    .UseStartup<Startup>()
+        //    .Build();
+
+        //host.Run();
         public static void Main(string[] args)
         {
-            var config = new ConfigurationBuilder()
-                .AddCommandLine(args)
-                .AddEnvironmentVariables("ASPNETCORE_")
-                .Build();
+            BuildWebHost(args).Run();
+        }
 
-            var host = new WebHostBuilder()
-                .UseConfiguration(config)
-                .UseKestrel()
-                .UseContentRoot(Directory.GetCurrentDirectory())
-                .UseIISIntegration()
+        public static IWebHost BuildWebHost(string[] args) =>
+            WebHost.CreateDefaultBuilder(args)
                 .UseStartup<Startup>()
                 .Build();
 
-            host.Run();
-        }
     }
 }
\ No newline at end of file

src/DotNetCore.CAP.SqlServer/CAP.SqlServerCapOptionsExtension.cs

@@ -23,7 +23,11 @@ namespace DotNetCore.CAP
             services.AddScoped<ICapPublisher, CapPublisher>();
             services.AddTransient<ICallbackPublisher, CapPublisher>();
             services.AddTransient<IAdditionalProcessor, DefaultAdditionalProcessor>();
+            AddSqlServerOptions(services);
+        }
 
+        private void AddSqlServerOptions(IServiceCollection services)
+        {
             var sqlServerOptions = new SqlServerOptions();
 
             _configure(sqlServerOptions);
@@ -32,9 +36,13 @@ namespace DotNetCore.CAP
             {
                 services.AddSingleton(x =>
                 {
-                    var dbContext = (DbContext)x.GetService(sqlServerOptions.DbContextType);
-                    sqlServerOptions.ConnectionString = dbContext.Database.GetDbConnection().ConnectionString;
-                    return sqlServerOptions;
+                    using (var scope = x.CreateScope())
+                    {
+                        var provider = scope.ServiceProvider;
+                        var dbContext = (DbContext)provider.GetService(sqlServerOptions.DbContextType);
+                        sqlServerOptions.ConnectionString = dbContext.Database.GetDbConnection().ConnectionString;
+                        return sqlServerOptions;
+                    }
                 });
             }
             else