1,首先在asp.net项目中，安装AWSSDK类库文件；

2，创建类文件，usingAWS的命名空间

     using Amazon.SimpleNotificationService;
     using Amazon.SimpleNotificationService.Model;

3，在亚马逊平台注册申请账号，并获取

   <add key="AWSAccessKey" value="AKIAI5JXXXXXXXXX" />

    <add key="AWSSecretKey" value="PiXXXXXXXXXXXXXXXXXXXX" />

    <add key="AWSRegion" value="us-west-2" />  //发送的区域代码  us-west-2

https://docs.aws.amazon.com/zh_cn/sns/latest/dg/sms_supported-countries.html

4，创建对象snsClient

  var snsClient = new AmazonSimpleNotificationServiceClient(ConfigHelper.AWSAccessKey, ConfigHelper.AWSSecret);

  PublishRequest publishReq = new PublishRequest()                
                { Message =code, PhoneNumber=phoneno};
                PublishResponse response = snsClient.Publish(publishReq);
                if (response != null && response.MessageId != null)

                {     

   

               }        

 response.HttpStatusCode=OK, response.MessageId="9eb24201-2ae2-5f72-8440-11879fdc401c" 表示发送成功

写的比较粗糙，请见谅，如果不明白之处请指出！

亚马逊官方文档：https://docs.aws.amazon.com/zh_cn/sns/latest/dg/sms_preferences.html