仅当EntityCollection或EntityReference不包含对象时，才可以调用加载 [英] Load can only be called when the EntityCollection or EntityReference does not contain objects

问题描述

如Title所示，当我使用Entity Framework 4.1的lazyload(关闭了跟踪)时，出现了错误.

As Title showed, When I use lazyload of Entity Framework 4.1 which turned tracking off I got the error.

完整的异常消息:

使用NoTracking合并选项返回对象时，只能在EntityCollection或EntityReference不包含对象的情况下调用Load

When an object is returned with a NoTracking merge option, Load can only be called when the EntityCollection or EntityReference does not contain objects

有人知道为什么吗?

推荐答案

将 DbContext 的 Configuration.ProxyCreationEnabled 字段设置为 false :

using (var dbContext = MyDbContext())
{
    dbContext.Configuration.ProxyCreationEnabled = false;

    return dbContext.MyProducts.AsNoTracking().Where(product => product.DepartmentId = departmentId);
}

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