重试分页 Microsoft Graph 数据答案

【问题标题】：Retry paging Microsoft Graph data重试分页 Microsoft Graph 数据
【发布时间】：2021-06-24 06:24:38
【问题描述】：

我正在尝试使用以下代码从 Microsoft Graph 获取用户（关注此文档 - https://docs.microsoft.com/en-us/graph/paging）：

        private readonly IGraphServiceClient _graphServiceClient;

        public async Task<IGroupTransitiveMembersCollectionWithReferencesPage> GetGroupMembersPageByIdAsync(string groupId)
        {
            return await _graphServiceClient
                                    .Groups[groupId]
                                    .TransitiveMembers
                                    .Request()
                                    .Top(999)
                                    .WithMaxRetry(5)
                                    .GetAsync();
        }

我正在尝试了解 WithMaxRetry() 属性。如果呼叫失败，是否会重试呼叫 5 次？有没有办法指定“每次重试前等待几秒钟”？

【问题讨论】：

标签： microsoft-graph-api graphserviceclient

【解决方案1】：

是的，就是调用失败会重试5次。

重试请求前的默认延迟为 3 秒。您可以创建自己的扩展方法来设置maxRetry 和delay。

public static class Helper
{
    /// <summary>
    /// Sets the maximum number of retries to the default Retry Middleware Handler for this request.
    /// This only works with the default Retry Middleware Handler.
    /// If you use a custom Retry Middleware Handler, you have to handle it's retrieval in your implementation.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="baseRequest">The <see cref="BaseRequest"/> for the request.</param>
    /// <param name="maxRetry">The maxRetry for the request.</param>
    /// <param name="delay">The delay before the request.</param>
    /// <returns></returns>
    public static T WithMaxRetry<T>(this T baseRequest, int maxRetry, int delay) where T : IBaseRequest
    {
        string retryOptionKey = typeof(RetryHandlerOption).ToString();
        if (baseRequest.MiddlewareOptions.ContainsKey(retryOptionKey))
        {
            var option = (baseRequest.MiddlewareOptions[retryOptionKey] as RetryHandlerOption);
            option.MaxRetry = maxRetry;
            option.Delay = delay;
        }
        else
        {
            baseRequest.MiddlewareOptions.Add(retryOptionKey, new RetryHandlerOption { MaxRetry = maxRetry, Delay = delay });
        }
        return baseRequest;
    }
}

延迟的最大值为 180 秒。

扩展方法基于BaseRequestExtensions

【讨论】：