EF6：可以在上下文外部使用导航属性值

Question

我使用一个using块通过Entity Framework从数据库中选择一个数据集：

protected StagingProcessingEngineStatus GetProcessingStatusEntryById (Guid processingId) {
    using (var context = new ProcessingEntities()) {
        var matchedPlan = context.StagingProcessingEngineStatus.FirstOrDefault(plan => plan.ProcessingId == processingId && plan.Owner == this.UserCredentials.UserId.ToString());        

        return matchedPlan;
    }
}

StagingProcessingEngineStatus实体包含另一个名为StagingRefProcessingEngineLibrary实体的导航属性：

public partial class ProcessingEntities : DbContext {
    public virtual DbSet<StagingProcessingEngineStatus> StagingProcessingEngineStatus { get; set; }
}    


public partial class StagingProcessingEngineStatus {
    public virtual StagingRefProcessingEngineLibrary StagingRefProcessingEngineLibrary { get; set; }
}

现在，我尝试使用GetProcessingStatusEntryById方法的返回值来访问StagingRefProcessingEngineLibrary属性的StagingProcessingEngineStatus 。

但是给了我以下例外：

ObjectContext实例已被放置，无法再用于需要连接的操作。

是否有可能在using块之外访问导航属性的值，如下所示？

var stagingPlan = this.GetProcessingStatusEntryById(processingId);

var library = GetProcessingLibraryByXmlString(stagingPlan.StagingRefProcessingEngineLibrary.LibraryXml);

Answer 1

要么不.Include(e => e.StagingRefProcessingEngineLibrary上下文（删除using ）以保持延迟加载功能，要么使用.Include(e => e.StagingRefProcessingEngineLibrary加载（ .Include(e => e.StagingRefProcessingEngineLibrary ）