Question

我正在尝试使用以下函数列出存储在CloudWatch中的所有指标：ListMetrics。该函数返回大约500个度量和一个名为NextToken的字符串值，该值将在下一次调用中用于获取其余度量。

这是我的代码，但我不知道如何使用NextToken来获取其余的指标。

  // creates the CloudWatch client
            var cw = Amazon.AWSClientFactory.CreateAmazonCloudWatchClient(Amazon.RegionEndpoint.EUWest1);
        // initialses the list metrics request
        ListMetricsRequest lmr = new ListMetricsRequest();
        ListMetricsResponse lmresponse = cw.ListMetrics(lmr);



        // loop that uses the token to get all the metrics available
        // not finished yet
        do
        {
            lmresponse = cw.ListMetrics(lmr);
            lmresponse.NextToken;

        } while (lmresponse.NextToken != null);

我想知道如何使用NextToken来获取其余的指标。遗憾的是，我在网上找不到任何例子。

Answer 1

将其置于do-while循环中可确保ListMetrics函数不断被调用，并且只要nextToken不为null，就会列出所有度量标准。

private string nextToken;

do
{
  lmrequest.NextToken = nextToken;
  lmresponse = cloudwatch.ListMetrics(lmrequest);
  nextToken = lmresponse.NextToken;
} while (nextToken != null);

Answer 2

如果您只需要遍历整个指标列表，我会使用foreach循环。代码如下所示：

        // creates the CloudWatch client
        var cw = Amazon.AWSClientFactory.CreateAmazonCloudWatchClient(Amazon.RegionEndpoint.EUWest1);
        // initialses the list metrics request
        ListMetricsRequest lmr = new ListMetricsRequest();
        ListMetricsResponse lmresponse = cw.ListMetrics(lmr);

        foreach (Metric metric in lmresponse.Metrics)
        {
            // do something with
            // metric.MetricName;
            // metric.Dimensions;
            // etc
        }

Answer 3

如果响应中有NextToken，您可以在下一个请求中使用它：

// creates the CloudWatch client
var cw =  Amazon.AWSClientFactory.CreateAmazonCloudWatchClient(Amazon.RegionEndpoint.EUWest1);
// initialses the list metrics request
ListMetricsRequest lmr = new ListMetricsRequest();
ListMetricsResponse lmresponse = cw.ListMetrics(lmr);

while (lmresponse.NextToken != null);
{
    // set request token 
    lmr.NextToken = lmresponse.NextToken;
    lmresponse = cw.ListMetrics(lmr);

    // Process metrics found in lmresponse.Metrics
}

如何在ListMetrics函数中使用nextToken

3 个答案: