如何访问Lambda环境变量?

时间:2018-08-04 19:26:30

标签: c# amazon-web-services asp.net-core aws-lambda

运行.net core 2.1 AWS Lambda函数时,使用以下命令从c#中的AWS Lambda控制台获取环境变量很简单:

var envVariable = Environment.GetEnvironmentVariable("myVariableName");

但是,当在AWS Lambda上将ASP.NET core 2.1作为无服务器应用程序运行时,此操作无效(以上返回null)。

我可以在launchSettings.json文件中设置一个 local env变量,但是我想从AWS Lambda控制台中使用Env变量。

如何在ASP.NET Core 2.1中访问AWS Lambda Env变量?

2 个答案:

答案 0 :(得分:18)

  

如何在ASP.NET Core 2.1中访问AWS Lambda Env变量

您可以像以前一样访问它。

var envVariable = Environment.GetEnvironmentVariable("myVariableName");

确保已为相应资源设置了环境变量,以便在调用时可用。

每个资源在 serverless.template 文件中都有一个条目,该文件是用于部署功能的AWS CloudFormation模板。

环境变量条目位于文件的Resources:{ResourceName}:Properties:Environment:Variables JSON路径下。

示例声明

{
  "AWSTemplateFormatVersion" : "2010-09-09",
  "Transform" : "AWS::Serverless-2016-10-31",
  "Description" : "An AWS Serverless Application that uses the ASP.NET Core framework running in Amazon Lambda.",
  "Parameters" : {
  },
  "Conditions" : {
  },
  "Resources" : {
    "Get" : {
      "Type" : "AWS::Serverless::Function",
      "Properties": {
        "Handler": "TimeZoneService::TimeZoneService.LambdaEntryPoint::FunctionHandlerAsync",
        "Runtime": "dotnetcore1.0",
        "CodeUri": "",
        "MemorySize": 256,
        "Timeout": 60,
        "Role": null,
        "Policies": [ "AWSLambdaFullAccess" ],
        "Environment" : {
          "Variables" : {
            "myVariableName" : "my environment variable value"
          }
        },
        "Events": {
          "PutResource": {
            "Type": "Api",
            "Properties": {
              "Path": "/{proxy+}",
              "Method": "ANY"
            }
          }
        }
      }
    }
  },
  "Outputs" : {
  }
}

引用Build and Test a Serverless Application with AWS Lambda

引用Creating a Serverless Application with ASP.NET Core, AWS Lambda and AWS API Gateway

答案 1 :(得分:0)

尝试一下:

public interface IEnviromentVariables {
    string getEnVariable(string variable);
}

public class EnviromentClass : IEnviromentVariables {
    public string getEnVariable(string variable) {
        return System.Environment.GetEnvironmentVariable(variable);
    }
}