Linq-To-SQL 多次访问数据库

我试图通过在一次数据库访问中包含子属性来提高 Linq-to-SQL 查询的效率。我首先尝试各种 linq 查询来完成此任务。查询变得越来越复杂，所以我尝试了 LoadWith() 选项：

我的 DAL 类的构造函数设置 LoadWith() 设置：

public TrackerJobData()
{
    dataLoadOptions = new DataLoadOptions();

    dataLoadOptions.LoadWith<TrackerJobRecord>(x => x.SpecBarcodeRecords);
    dataLoadOptions.LoadWith<TrackerJobRecord>(x => x.TrackerJobEquipmentTriggerRecords);
    dataLoadOptions.LoadWith<TrackerJobRecord>(x => x.EtaRecord);

    this.Database.LoadOptions = dataLoadOptions;
}

这是我正在使用的查询：

public TrackerJob GetItem(int trackerJobId)
{
    TrackerJobRecord record =
        (from trackerJob in this.Database.TrackerJobRecords
         where trackerJob.TrackerJobId == trackerJobId
         select trackerJob).FirstOrDefault();

    return record.Map();
}

当我调试并F10仅在 linq 查询上（不是返回），我在 SQL Profiler 中得到以下输出：

请原谅我对 SQL Profiler 的无知，但是突出显示的三行是否意味着从客户端（我的代码）到服务器有 3 次往返？如果是这样，为什么？ SQL Server 是否会执行多个 sp_executesql 调用one trip?

既然我认为 LoadWith() 会消除多次调用，那么我做错了什么？

EDIT

以下是 SQL Profiler 中的三个语句：

exec sp_executesql N'SELECT TOP (1) [t0].[TrackerJobId], [t0].[Name], [t0].[EtaId], [t0].[SamplingProcessorTypeId], [t0].[Description], [t0].[LastModifiedUser], [t0].[LastModifiedTime], [t0].[VersionNumber], [t0].[Active], [t0].[Archived], [t1].[EtaId] AS [EtaId2], [t1].[EtaNumber], [t1].[Title], [t1].[State], [t1].[DateInitialized], [t1].[EtaOriginatorId], [t1].[Quantity], [t1].[Ehs], [t1].[Ship], [t1].[InternalUse], [t1].[DateClosed], [t1].[ExperimentId], [t1].[Disposition], [t1].[TestType], [t1].[LastModifiedUser] AS [LastModifiedUser2], [t1].[LastModifiedTime] AS [LastModifiedTime2], [t1].[VersionNumber] AS [VersionNumber2]
FROM [AutoTracker].[TrackerJob] AS [t0]
INNER JOIN [Global].[Eta] AS [t1] ON [t1].[EtaId] = [t0].[EtaId]
WHERE [t0].[TrackerJobId] = @p0',N'@p0 int',@p0=17

exec sp_executesql N'SELECT [t0].[SpecBarcodeId], [t0].[TrackerJobId], [t0].[EquipmentId], [t0].[StartTime], [t0].[EndTime], [t0].[LastModifiedUser], [t0].[LastModifiedTime], [t0].[VersionNumber]
FROM [AutoTracker].[SpecBarcode] AS [t0]
WHERE [t0].[TrackerJobId] = @x1',N'@x1 int',@x1=17

exec sp_executesql N'SELECT [t0].[TrackerJobId], [t0].[EquipmentId], [t0].[LastModifiedUser], [t0].[LastModifiedTime], [t0].[VersionNumber]
FROM [AutoTracker].[TrackerJobEquipmentTrigger] AS [t0]
WHERE [t0].[TrackerJobId] = @x1',N'@x1 int',@x1=17

Linq-2-sqlLoadWith不支持多个 1:N 关系。

http://weblogs.asp.net/zeeshanhirani/archive/2008/08/11/constraints-with-loadwith-when-loading-multiple-1-n-relationships.aspx http://weblogs.asp.net/zeeshanhirani/archive/2008/08/11/constraints-with-loadwith-when-loading-multiple-1-n-relationships.aspx

使用多个 DataLoadOptions 的 Linq2SQl 预加载 https://stackoverflow.com/questions/644576/linq2sql-eager-load-with-multiple-dataloadoptions