如何使用C＃Graph SDK批量刪除Office365中的事件

Question

我有一個刪除多個事件的方法。 當前代碼如下：

    public async Task DeleteEvents(IEnumerable<string> eventExternalIds)
    {
        foreach(var eventExternalId in eventExternalIds)
        {
            await DeleteEvent(eventExternalId);
        }
    }

    public async Task DeleteEvent(string eventExternalId)
    {
        await GraphClient
            .Users[Username]
            .Calendars[CalendarName]
            .Events[eventExternalId]
            .Request()
            .DeleteAsync();
    }

我可以想象，如果刪除大量ID，效果會不佳。 有沒有一種方法可以將它們全部刪除而不是逐個刪除？

Answer 1

msgraph-sdk-dotnet v1.15.0或更高版本

對於msgraph-sdk-dotnet版本1.15.0或更高版本，已通過BatchRequestContent類引入了對批處理請求的支持

例

//1. construct a Batch request 
var batchRequestContent = new BatchRequestContent();
var step = 1;
foreach (var eventId in eventIds)
{
     var requestUrl = graphClient
           .Me
           .Events[eventId]
           .Request().RequestUrl;

     var request = new HttpRequestMessage(HttpMethod.Delete, requestUrl);
     var requestStep = new BatchRequestStep(step.ToString(), request, null);
     batchRequestContent.AddBatchRequestStep(requestStep);
     step++;
}


//2. Submit request
var batchRequest = new HttpRequestMessage(HttpMethod.Post, "https://graph.microsoft.com/v1.0/$batch");
batchRequest.Content = batchRequestContent;
await graphClient.AuthenticationProvider.AuthenticateRequestAsync(batchRequest);
var httpClient = new HttpClient();
var batchResponse = await httpClient.SendAsync(batchRequest);
//3. Process response
var batchResponseContent = new BatchResponseContent(batchResponse);
var responses = await batchResponseContent.GetResponsesAsync();
foreach (var response in responses)
{
     if (response.Value.IsSuccessStatusCode)
     {
         //...
     }                 
}

問題

• 針對NetCore 2.1或更高版本或.NET Framework NullReferenceException可能會發生異常，要解決此問題，您可以切換到1.16.0-preview.1 （ 詳細信息 ）

限制

注意：一個批次最多只能容納20個請求

msgraph-sdk-dotnet v1.14.0或更舊版本

對於以前的版本，以下示例演示如何實現對批處理請求的支持：

var batchRequest = new BatchRequest();
foreach (var eventId in eventIds)
{
   var request = graphClient.Me.Events[eventId].Request();
   batchRequest.AddQuery(request,HttpMethod.Delete);
}
var responses = await graphClient.SendBatchAsync(batchRequest);

其中BatchRequest是一個自定義類，它添加了對JSON批處理的支持