AWS with .NET - 从 CloudWatch 读取日志 - 没有返回日志数据

我正在尝试使用 .NET 从 CloudWatch 读取使用 SNS 发送的消息的日志数据。

从 CloudWatch 控制台 (CloudWatch \ CloudWatch Logs \ Logs Insights)，我输入：

Date range: custom (2w)
LogGroup: sns/ap...../8...../LogName 
Query: fields @timestamp, @message | sort @timestamp desc | limit 20

它返回大量日志记录（@timestamp | @message）

我正在尝试使用 .net AWS SDK 从 c# 执行相同的操作：

public async Task GetLogs()
{
    string logGroupName = "sns/ap...../8...../LogName";

    AWSOptions options = configuration.GetAWSOptions();
    IAmazonCloudWatchLogs logs = options.CreateServiceClient<IAmazonCloudWatchLogs>();

    StartQueryRequest startQueryRequest = new StartQueryRequest();
    startQueryRequest.LogGroupName = logGroupName;
    startQueryRequest.StartTime = 1577850562; //1 Jan 2020
    TimeSpan t = DateTime.UtcNow - new DateTime(1970, 1, 1); //Epoch time starts on 1/1/1970
    int secondsSinceEpoch = (int)t.TotalSeconds;
    startQueryRequest.EndTime = secondsSinceEpoch;
    startQueryRequest.QueryString = "fields @timestamp, @message | sort @timestamp desc";
    startQueryRequest.Limit = 1000;
    StartQueryResponse response2 = await logs.StartQueryAsync(startQueryRequest);

    Console.WriteLine();
}

无法弄清楚为什么它不返回任何记录。

Response2 = 
   ContentLength: 50
   QueryId: "guid..."
   ResponseMetadata:
      Metadata Count = 0
      RequestId = "guid..."

知道我做错了什么吗？谢谢！

如果它对其他人有帮助 - 这是我使用 C# 从 AWS 获取日志的方法

public async Task GetLogs()
{
    string logGroupName = "log group name from CloudWatch Log";

    AWSOptions options = configuration.GetAWSOptions();
    IAmazonCloudWatchLogs logs = options.CreateServiceClient<IAmazonCloudWatchLogs>();

    StartQueryRequest startQueryRequest = new StartQueryRequest();
    startQueryRequest.LogGroupName = logGroupName;
    startQueryRequest.StartTime = 1577850562; //1 Jan 2020
    TimeSpan t = DateTime.UtcNow - new DateTime(1970, 1, 1); //Epoch time starts on 1/1/1970
    int secondsSinceEpoch = (int)t.TotalSeconds;
    startQueryRequest.EndTime = secondsSinceEpoch;
    startQueryRequest.QueryString = "fields @timestamp, @message | sort @timestamp desc";
    startQueryRequest.Limit = 1000;
    StartQueryResponse startQueryResponse = await logs.StartQueryAsync(startQueryRequest);

    GetQueryResultsRequest getQueryRequest = new GetQueryResultsRequest();
    getQueryRequest.QueryId = startQueryResponse.QueryId;

    GetQueryResultsResponse getQueryResults = await logs.GetQueryResultsAsync(getQueryRequest);
    for (var i=0; i<getQueryResults.Results.Count; i++)
    {
        ResultField timestampResult = getQueryResults.Results[i][0];
        ResultField messageResult = getQueryResults.Results[i][1];
        var message = JsonConvert.DeserializeObject(messageResult.Value);
        Console.WriteLine(message);
    }           
    Console.WriteLine();
}