AWS SDK (C#) -如何创建describe实例请求使用特定标记键过滤出vms

Question

我已经看到了几种亚马逊网络服务CLI的解决方案，但我不确定如何将这些查询转换为亚马逊网络服务.net软件开发工具包。

给定:亚马逊网络服务.net软件开发工具包；具有特定标签密钥的亚马逊网络服务实例(例如EXCLUDE_ME)

问题:需要创建一个Amazon.EC2.Model.Filter实例，该实例将过滤出具有特定标签键的vms。

谢谢。

Answer 1

有一种方法可以根据值进行筛选，以便在DescribeInstances返回的列表中包含但不排除实例。我创建了一个小示例，它对DescribeInstances进行了两次调用。此示例使用分页器异步检索结果：

        class DescribeInstances
    {
        static async Task Main()
        {
            // If the region of the EC2 instances is different from that
            // of the default user, you need to specify the rgion when
            // you create the client object.
            var eC2Client = new AmazonEC2Client(RegionEndpoint.USEast1);

            await GetInstanceDescriptions(eC2Client);

            await GetInstanceDescriptionsFiltered(eC2Client, "IncludeInList", "Yes");
        }

        static async Task GetInstanceDescriptions(AmazonEC2Client client)
        {
            var request = new DescribeInstancesRequest();

            Console.WriteLine("Showing all instances:");
            var paginator = client.Paginators.DescribeInstances(request);

            await foreach (var response in paginator.Responses)
            {
                foreach (var reservation in response.Reservations)
                {
                    foreach (var instance in reservation.Instances)
                    {
                        Console.Write($"Instance ID: {instance.InstanceId}");
                        Console.WriteLine($"\tCurrent State: {instance.State.Name}");
                    }
                }
            }
        }

        static async Task GetInstanceDescriptionsFiltered(AmazonEC2Client client, string tagName, string tagValue)
        {
            // This is the tag we want to use to filter
            // the results of our list of instances.
            var filters = new List<Filter>
            {
                new Filter
                {
                    Name = $"tag:{tagName}",
                    Values = new List<string>
                    {
                        tagValue,
                    },
                },
            };
            var request = new DescribeInstancesRequest
            {
                Filters = filters,
            };

            Console.WriteLine("\nShowing instances with tag: \"IncludeInList\" set to \"Yes\".");
            var paginator = client.Paginators.DescribeInstances(request);

            await foreach (var response in paginator.Responses)
            {
                foreach (var reservation in response.Reservations)
                {
                    foreach (var instance in reservation.Instances)
                    {
                        Console.Write($"Instance ID: {instance.InstanceId} ");
                        Console.WriteLine($"\tCurrent State: {instance.State.Name}");
                    }
                }
            }
        }
    }

如果要使用标记排除，则需要检索整个列表，然后在循环结果时，检查标记值并跳过符合条件的值。

如果您想了解Filters属性可以使用哪些值，请参阅此处的API参考：DescribeInstancesRequest，了解有关Filters属性的可能值的信息。

有关使用分页器的更多信息，请参阅本文：Introducing Paginators in AWS SDK for .NET v3.5