实体框架DbExecutionStrategy在没有设置Database.CommandTimeout的情况下无法工作

Question

有一个基于DbConfiguration的CustomDbConfiguration类：

internal class CustomDBConfiguration : DbConfiguration

构造函数设置执行策略，拦截器用于生成瞬态失败：

    /// <summary>
    /// Constructor.
    /// </summary>
    public CustomDBConfiguration()
    {
        // Add transient failure.
        AddInterceptor(new TransientFailure());  // <-- Used to create a transient failure.

        // Set the execution strategy.
        SetExecutionStrategy
            (SqlProviderServices.ProviderInvariantName,
            () => new MyDBExecutionStrategy(3, TimeSpan.FromSeconds(10)));
    }

MyDBExecutionStrategy基于DbExecutionStrategy：

internal class MyDBExecutionStrategy : DbExecutionStrategy

发生错误时实现ShouldRetryOn布尔值：

    /// <summary>
    /// Retry on error?
    /// </summary>
    /// <param name="ex"></param>
    /// <returns></returns>
    protected override bool ShouldRetryOn(Exception ex)

但是，当我实例化我的DbContext时，如果我没有包含＆＃34; _context.Database.CommandTimeout = 1;＆＃34;然后不使用执行策略：

    /// <summary>
    /// Test by getting a list of people.
    /// </summary>
    private void TryItOut()
    {
        if (!string.IsNullOrEmpty(_connectionString))
        {
            try
            {
                // Create a new Context instance, with a connection string specified.
                _context = new MyDBContext(_connectionString);

                // --- IF I TEXT THIS LINE OUT THEN THE EXECUTION STRATEGY ISN'T IMPLEMENTED ---
                _context.Database.CommandTimeout = 1;  

                List<Person> people = _context.People.ToList();

                MessageBox.Show("People count: " + people.Count());
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString(), "Error occurred", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            }
        }            
    }

在我看来，这条线似乎是多余的，但如果它不存在则不会调用该策略。

我做错了什么？

提前致谢。