ObjectContext为分离实体泄漏内存

我已经使用内存分析器检查了这一点，并且没有真正的实体留在内存但是哈希集，字典和EntityKey对象-但我发现没有办法如何断开这些引用。

所以简单的问题:我如何阻止上下文(或其ObjectStateManager)从无限增长的大小?

[是的，我知道应该避免长时间的上下文，但在这种情况下，它是一个复杂的分析运行，需要加载几个分层数据(下面的示例只是一个最小的问题演示)，所以最后它是一个"短"的单操作上下文。]

复制步骤:

• 创建新的控制台应用程序
• 为Northwind数据库创建EF模型(使用一些真实的SQL Server或复制Northwind)。(从压缩样本文件夹)
• 使用代码:

代码[已更新，不再需要真正的数据库连接]:

class Program
{
    static void Main()
    {
        const double MiB = 1024 * 1024;
        using ( var context = new NorthwindEntities() )
        {
            var last = GC.GetTotalMemory(true) / MiB;
            Console.WriteLine("before run: {0:n3} MiB", last);
            var id = 0;
            while ( true )
            {
                Run(context, ref id);
                GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
                GC.WaitForPendingFinalizers();
                var current = GC.GetTotalMemory(true) / MiB;
                Console.WriteLine("after run: {0:n3} MiB (+{1:n3} MiB)", current, current - last);
                last = current;
                if ( Console.KeyAvailable )
                    break;
                Console.WriteLine(new string('-', 100));
            }
        }
    }
    static void Run(NorthwindEntities context, ref int id)
    {
        for ( int i = 0; i < 100000; i++ )
        {
            var category = new Category { Category_ID = ++id };
            category.EntityKey = new EntityKey("NorthwindEntities.Categories", "Category_ID", id);
            var product = new Product { Product_ID = id, Category_ID = id };
            product.EntityKey = new EntityKey("NorthwindEntities.Products", "Product_ID", id);
            product.Category = category;
            context.Attach(product);
            context.Detach(product);
            context.Detach(category);
        }
        var ctr = 0;
        Console.WriteLine("Enumerating living/attached objects:");
        const EntityState AllStates = EntityState.Added | EntityState.Deleted | EntityState.Modified | EntityState.Unchanged;
        foreach ( var entry in context.ObjectStateManager.GetObjectStateEntries(AllStates) )
            Console.WriteLine("  #{0} [{1}] {2}", ++ctr, entry.EntityKey, entry.Entity);
        if ( ctr == 0 )
            Console.WriteLine("  NOTHING (as expected)");
    }
}