5

我最近一直在使用带有 StructureMap 的新 MVC 框架，并且总体上取得了不错的效果，但是，我一直遇到一个非常奇怪的错误，我无法理解或想出如何解决。

这是我的架构：

  • DBContext - linqToSql 数据上下文。
  • IRepository - 合同定义数据方法。
  • IService - 定义服务方法的合同。
  • 控制器 - 本例中为两个。

因此，我有：

public class Repo : IRepository
{
    public Repo(DBContext db)
    {
       .....
    }
}

public class Service : IService
{
    public Service(IRepository repo)
    {
       .....
    }
}

public class ControllerOne : Controller
{
    public ControllerOne(IService service)
    {
       .....
    }
}

public class ControllerTwo : Controller
{
    public ControllerTwo(IService service)
    {
       .....
    }
}

StructureMap 用于为 IRepository 和 IService 定义具体类型，并且 DBContext 由 DSL 注册表配置的 Lamba 表达式 - () => new DBContext() 构造。

目前没有缓存DBContext

关于问题：

我的索引页面加载并同时向 ControllerOne 和 ControllerTwo 发出两个 Ajax 请求，这些请求是通过 MvcContrib 的 StructureMap 控制器工厂构造的。

StructureMap 正在注入 IService 的具体类型，而这些类型又是使用配置的 IRepository 实例和新的 DBContext 对象创建的。

ControllerOne 正在从 IService 实例请求模型，然后将其作为 JsonActionResult 返回，由 Newtonsoft.Json 呈现。

ControllerTwo 向 IService 实例请求不同的模型，当 MVC 框架执行 ActionResult 时，该模型也被序列化为 Json 对象。

我在 VS2008 中通过 Cassini 运行网站。

我不时看到的问题是从 LinqToSql 内部生成的错误

  • 无法读取数据，已经有一个读取器打开或
  • 由于数据已经存在，因此无法将数据加载到数据表中（目前我没有确切的例外情况，但两者都是 LinqToSql 内部的）。

如果错误发生在 ControllerOne 中，那么 ControllerTwo 也会失败并出现类似的错误，就好像这两个请求正在使用共享对象运行一样。

它不会一直出错，但足以让我担心我的架构以及它在某种程度上配置错误。

StructureMap 是否可以在后续请求中返回相同的 ControllerOne 和 ControllerTwo 实例，或者是否以任何方式缓存 DBContext？即使我没有要求它？

有没有人在 Visual Studio / Cassini 中工作时看到过类似的东西？通过 IIS 有帮助吗？

我应该删除 LinqToSql 吗？

关闭 Visual Studio 并再次打开通常可以在一段时间内解决问题。

非常感谢，如果有人能阐明这个问题。

编辑：包括来自 NLog 日志文件的日志记录片段（线程 id 是分号前的数字）：

03/20/2009 01:40:32 12: controller=Timesheet,date=2001-05-06,Action=WeekEnding /beta/Timesheet/2001-05-06?_dc=1237513232397 
03/20/2009 01:40:32 10: controller=Timesheet,date=2001-05-06,Action=WeekEnding /beta/Timesheet/2001-05-06?_dc=1237513232449 
03/20/2009 01:40:32 10: There is already an open DataReader associated with this Command which must be closed first. System.InvalidOperationException[br]   at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command)
   at System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command)
   at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.ExecuteReader()
   at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult)
   at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries)
   at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
   at System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute[S](Expression expression)
   at System.Linq.Queryable.Sum[TSource](IQueryable`1 source, Expression`1 selector)
   at HCD.Intranet.Core.Data.Linq.LinqEmployeeRepository.CalculateHolidaysRemaining(Employee employee, DateTime weekEnding, Int32 nonProjectId)
   at HCD.Intranet.Core.Services.Impl.EmployeeService.CalculateHolidaysRemaining(Employee employee, DateTime weekEnding)
   at HCD.Intranet.Core.Models.Timesheet.CalculateHolidaysRemaining()
   at HCD.Intranet.Core.Models.Json.TimesheetJsonConverter.WriteTimesheet(JsonWriter writer, Timesheet timesheet)
   at HCD.Intranet.Core.Models.Json.TimesheetJsonConverter.WriteJson(JsonWriter writer, Object value)
   at Newtonsoft.Json.JsonSerializer.SerializeValue(JsonWriter writer, Object value, JsonConverter memberConverter)
   at Newtonsoft.Json.JsonSerializer.WriteMemberInfoProperty(JsonWriter writer, Object value, JsonMemberMapping memberMapping)
   at Newtonsoft.Json.JsonSerializer.SerializeObject(JsonWriter writer, Object value)
   at Newtonsoft.Json.JsonSerializer.SerializeValue(JsonWriter writer, Object value, JsonConverter memberConverter)
   at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value)
   at HCD.Intranet.Core.Web.Mvc.NewtonsoftJsonResult.ExecuteResult(ControllerContext context)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<InvokeActionResultWithFilters>b__e()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<>c__DisplayClass13.<InvokeActionResultWithFilters>b__10()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<>c__DisplayClass13.<InvokeActionResultWithFilters>b__10()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
03/20/2009 01:40:32 12: Invalid attempt to call Read when reader is closed. System.InvalidOperationException[br]   at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult)
   at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries)
   at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
   at System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute[S](Expression expression)
   at System.Linq.Queryable.Sum[TSource](IQueryable`1 source, Expression`1 selector)
   at HCD.Intranet.Core.Data.Linq.LinqEmployeeRepository.CalculateHolidaysRemaining(Employee employee, DateTime weekEnding, Int32 nonProjectId)
   at HCD.Intranet.Core.Services.Impl.EmployeeService.CalculateHolidaysRemaining(Employee employee, DateTime weekEnding)
   at HCD.Intranet.Core.Models.Timesheet.CalculateHolidaysRemaining()
   at HCD.Intranet.Core.Models.Json.TimesheetJsonConverter.WriteTimesheet(JsonWriter writer, Timesheet timesheet)
   at HCD.Intranet.Core.Models.Json.TimesheetJsonConverter.WriteJson(JsonWriter writer, Object value)
   at Newtonsoft.Json.JsonSerializer.SerializeValue(JsonWriter writer, Object value, JsonConverter memberConverter)
   at Newtonsoft.Json.JsonSerializer.WriteMemberInfoProperty(JsonWriter writer, Object value, JsonMemberMapping memberMapping)
   at Newtonsoft.Json.JsonSerializer.SerializeObject(JsonWriter writer, Object value)
   at Newtonsoft.Json.JsonSerializer.SerializeValue(JsonWriter writer, Object value, JsonConverter memberConverter)
   at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value)
   at HCD.Intranet.Core.Web.Mvc.NewtonsoftJsonResult.ExecuteResult(ControllerContext context)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<InvokeActionResultWithFilters>b__e()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<>c__DisplayClass13.<InvokeActionResultWithFilters>b__10()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<>c__DisplayClass13.<InvokeActionResultWithFilters>b__10()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
03/20/2009 01:41:58 12: controller=Timesheet,month=6,year=2001,Action=Calendar /beta/Timesheet/Calendar/6/2001?_dc=1237513318470 
03/20/2009 01:41:59 10: controller=Timesheet,date=2001-06-03,Action=WeekEnding /beta/Timesheet/2001-06-03?_dc=1237513318509 
03/20/2009 01:41:59 12: The null value cannot be assigned to a member with type System.Int32 which is a non-nullable value type. System.InvalidOperationException[br]   at Read_TimesheetEntry(ObjectMaterializer`1 )
   at System.Data.Linq.SqlClient.ObjectReaderCompiler.ObjectReader`2.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at HCD.Intranet.Core.Data.Linq.LinqTimesheetRepository.GetEntries(Int32 timesheetHeaderId)
   at HCD.Intranet.Core.Services.Impl.TimesheetService.GetEntries(Int32 timesheetHeaderId)
   at HCD.Intranet.Core.Models.Timesheet.get_InnerEntries()
   at HCD.Intranet.Core.Models.TimeMap..ctor(Timesheet timesheet)
   at HCD.Intranet.Core.Models.Json.TimesheetCalendarJsonConverter.WriteTimesheet(JsonWriter writer, Timesheet[] timesheets)
   at HCD.Intranet.Core.Models.Json.TimesheetCalendarJsonConverter.WriteJson(JsonWriter writer, Object value)
   at Newtonsoft.Json.JsonSerializer.SerializeValue(JsonWriter writer, Object value, JsonConverter memberConverter)
   at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value)
   at HCD.Intranet.Core.Web.Mvc.NewtonsoftJsonResult.ExecuteResult(ControllerContext context)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<InvokeActionResultWithFilters>b__e()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<>c__DisplayClass13.<InvokeActionResultWithFilters>b__10()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<>c__DisplayClass13.<InvokeActionResultWithFilters>b__10()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
03/20/2009 01:41:59 12: controller=Timesheet,date=2001-06-03,Action=WeekEnding /beta/Timesheet/2001-06-03?_dc=1237513318545 
03/20/2009 01:41:59 12: There is already an open DataReader associated with this Command which must be closed first. System.InvalidOperationException[br]   at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command)
   at System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command)
   at System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.ExecuteReader()
   at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult)
   at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries)
   at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
   at System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute[S](Expression expression)
   at System.Linq.Queryable.Sum[TSource](IQueryable`1 source, Expression`1 selector)
   at HCD.Intranet.Core.Data.Linq.LinqEmployeeRepository.CalculateHolidaysRemaining(Employee employee, DateTime weekEnding, Int32 nonProjectId)
   at HCD.Intranet.Core.Services.Impl.EmployeeService.CalculateHolidaysRemaining(Employee employee, DateTime weekEnding)
   at HCD.Intranet.Core.Models.Timesheet.CalculateHolidaysRemaining()
   at HCD.Intranet.Core.Models.Json.TimesheetJsonConverter.WriteTimesheet(JsonWriter writer, Timesheet timesheet)
   at HCD.Intranet.Core.Models.Json.TimesheetJsonConverter.WriteJson(JsonWriter writer, Object value)
   at Newtonsoft.Json.JsonSerializer.SerializeValue(JsonWriter writer, Object value, JsonConverter memberConverter)
   at Newtonsoft.Json.JsonSerializer.WriteMemberInfoProperty(JsonWriter writer, Object value, JsonMemberMapping memberMapping)
   at Newtonsoft.Json.JsonSerializer.SerializeObject(JsonWriter writer, Object value)
   at Newtonsoft.Json.JsonSerializer.SerializeValue(JsonWriter writer, Object value, JsonConverter memberConverter)
   at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value)
   at HCD.Intranet.Core.Web.Mvc.NewtonsoftJsonResult.ExecuteResult(ControllerContext context)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<InvokeActionResultWithFilters>b__e()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<>c__DisplayClass13.<InvokeActionResultWithFilters>b__10()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<>c__DisplayClass13.<InvokeActionResultWithFilters>b__10()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
03/20/2009 01:41:59 10: Invalid attempt to call Read when reader is closed. System.InvalidOperationException[br]   at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult)
   at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries)
   at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
   at System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute[S](Expression expression)
   at System.Linq.Queryable.Sum[TSource](IQueryable`1 source, Expression`1 selector)
   at HCD.Intranet.Core.Data.Linq.LinqEmployeeRepository.CalculateHolidaysRemaining(Employee employee, DateTime weekEnding, Int32 nonProjectId)
   at HCD.Intranet.Core.Services.Impl.EmployeeService.CalculateHolidaysRemaining(Employee employee, DateTime weekEnding)
   at HCD.Intranet.Core.Models.Timesheet.CalculateHolidaysRemaining()
   at HCD.Intranet.Core.Models.Json.TimesheetJsonConverter.WriteTimesheet(JsonWriter writer, Timesheet timesheet)
   at HCD.Intranet.Core.Models.Json.TimesheetJsonConverter.WriteJson(JsonWriter writer, Object value)
   at Newtonsoft.Json.JsonSerializer.SerializeValue(JsonWriter writer, Object value, JsonConverter memberConverter)
   at Newtonsoft.Json.JsonSerializer.WriteMemberInfoProperty(JsonWriter writer, Object value, JsonMemberMapping memberMapping)
   at Newtonsoft.Json.JsonSerializer.SerializeObject(JsonWriter writer, Object value)
   at Newtonsoft.Json.JsonSerializer.SerializeValue(JsonWriter writer, Object value, JsonConverter memberConverter)
   at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value)
   at HCD.Intranet.Core.Web.Mvc.NewtonsoftJsonResult.ExecuteResult(ControllerContext context)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<InvokeActionResultWithFilters>b__e()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<>c__DisplayClass13.<InvokeActionResultWithFilters>b__10()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)
   at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass11.<>c__DisplayClass13.<InvokeActionResultWithFilters>b__10()
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)
4

4 回答 4

6

我正在与 Jeremy Miller 讨论这个问题，您不想使用 SM 管理数据库上下文的生命周期 - 让 repo 根据需要进行实例化。这给您将如何进行对象更新/持久性带来了问题（如果您依赖于一个上下文为多个请求保持活动状态），但是对于 Web 应用程序不依赖它是值得的。

出于这样的原因，我不得不从店面中删除数据库上下文管理的东西——我遇到了内存泄漏。我不会说这是 SM 的错——但总的来说，只是让 repo 打开一个新的上下文。

于 2009-03-16T17:42:47.350 回答
2

添加：

MultipleActiveResultSets=True

到连接字符串的末尾（假设 MSSQL 2005+）

要为您的 linq 上下文执行此操作：打开属性选项卡 -> 展开连接 -> 单击“连接字符串”上的“...” -> '高级' -> 'MultipleActiveResultSets' -> true。

我今天自己解决了这个问题，我的架构几乎相同（除了统一而不是结构图）。包括通过 JS 加载的两个控制器！

于 2009-03-16T12:16:41.627 回答
2

将 DI 容器与 ASP.NET MVC 一起使用时的一个常见错误是许多 DI 容器默认为单例模式。我不知道这里是否是这种情况，但你应该仔细检查一下。ASP.NET MVC 要求在每个请求上创建控制器，因为它具有每个请求的状态和上下文。

于 2009-03-16T16:15:05.393 回答
1

您是否完全确定对象层次结构中没有任何内容被缓存/或具有生命周期配置？我有一个配置如下的产品应用程序：

    ForRequestedType<SomeDataContext>().TheDefault.Is.ConstructedBy(
        () => new SomeDataContext(someConnString);

它没有使用 asp.net MVC。关于范围问题，如果您没有设置任何内容，结构映射将默认为 PerRequest（不是 asp.net 请求，而是结构映射请求，如每个 .GetInstance 调用） - http://structuremap.sourceforge.net/Scoping。 .htm _ 如果您肯定没有配置会影响它，那么请查看 mvc contrib 或其他东西是否可能正在重用实例。

关于发布的异常信息。该错误涉及操作结果、操作结果过滤器、json 序列化、自定义方法的组合，以及一个 linq2sql 调用因意外 null 而失败。这是许多不同部分的组合，其中一些我不知道。我会玩得更安全，并将在进行序列化时调用的计算内容（调用 linq2sql）移动到不涉及 json 序列化/动作结果片段的其他地方。这只是一个疯狂的猜测，因为我不知道这些部分是如何/何时被调用的，以及它们在内部有什么类型的操作。

于 2009-03-17T02:36:17.223 回答