配置NEventStore方言时出现问题

Question

我正在开发一个原型CQRS实现，并尝试将Jonathan Oliver的事件存储与MS SQL server结合使用：

 _store = Wireup.Init()
            .UsingSqlPersistence("EventStore")
                .InitializeDatabaseSchema()
            .UsingJsonSerialization()
            .Build();

我在app.config中定义了一个匹配的连接字符串：

<connectionStrings>
    <add name="Business.Domain.Repository.Tests.Properties.Settings.EventStore"
        connectionString="Data Source=EventStore.sdf;" />
</connectionStrings>

我尝试了SQL CE、本地SQL和远程SQL服务器的连接字符串的变体，但总是收到以下错误：

    System.NullReferenceException was caught
  Message=Object reference not set to an instance of an object.
  Source=EventStore
  StackTrace:
       at EventStore.Persistence.SqlPersistence.SqlPersistenceFactory.GetDialect() in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Persistence.SqlPersistence\SqlPersistenceFactory.cs:line 53
       at EventStore.Persistence.SqlPersistence.SqlPersistenceFactory.Build() in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Persistence.SqlPersistence\SqlPersistenceFactory.cs:line 46
       at EventStore.SqlPersistenceWireup.<>c__DisplayClass4.<.ctor>b__1(NanoContainer c) in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Wireup\SqlPersistenceWireup.cs:line 13
       at EventStore.ContainerRegistration.Resolve(NanoContainer container) in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Wireup\NanoContainer.cs:line 66
       at EventStore.NanoContainer.Resolve[TService]() in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Wireup\NanoContainer.cs:line 40
       at EventStore.PersistenceWireup.Build() in c:\Projects\Business\Proto1\EventStore\src\proj\EventStore.Wireup\PersistenceWireup.cs:line 47

以前有没有人遇到过这种情况，或者知道我做错了什么？我尝试单步执行源代码，但仍然不确定为什么会有空引用。-Steve

Answer 1

我正在更新一些围绕方言检测的错误处理。您需要在连接字符串中添加"providerName“，例如：

 <add name="Business.Domain.Repository.Tests.Properties.Settings.EventStore"
  providerName="System.Data.SqlServerCe.3.5"
  connectionString="Data Source=EventStore.sdf;" />

在连接配置中具有providerName属性允许EventStore知道在连接到数据库实例时使用哪个驱动程序。