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Azure门户中的Azure Function Environment.GetEnvironment变量对象引用错误

azure-iot-hub azure-functions azure visual-studio c#

Sibeesh Venu · 技术社区 · 5 年前

我已使用visual studio 2017将我的应用程序发布到Azure函数。由于来自环境变量的连接字符串总是空的,我在日志中得到了对象引用错误,但是,应用程序在本地运行良好。下面是我获取连接字符串并记录它的代码片段。

var helper = new Helper();

log.LogInformation($ "The connection string is {helper.GetConnectionString()}");

if (string.IsNullOrWhiteSpace(helper.GetConnectionString())) return req.CreateErrorResponse(HttpStatusCode.BadRequest, "Connection is null");

var signalRService = new SignalRService(helper.GetConnectionString(), helper.GetIotHubName(), log);
log.LogInformation("SignalRService has been initialized");

await signalRService.SendRequest(helper.GetIotHubName(), data?.ToString());
log.LogInformation("SignalRService has been invoked successfully");

return req.CreateResponse(HttpStatusCode.OK, "Success");

下面是我的助手类

public class Helper {
    private static readonly string connectionStringName = "AzureSignalRConnectionString";
    private static readonly string iotHubName = "iotHubName";

    public string GetConnectionString() {
        return Environment.GetEnvironmentVariable(connectionStringName, EnvironmentVariableTarget.Process);
    }
    public string GetIotHubName() {
        return Environment.GetEnvironmentVariable(iotHubName, EnvironmentVariableTarget.Process);
    }
}

当我在门户中监视我的函数时,我可以清楚地看到连接字符串为空。我已经在local.settings.json中给出了连接字符串。

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet",
    "iotHubName": "iot-hub",
    "AzureSignalRConnectionString": "connection string value",
    "MSDEPLOY_RENAME_LOCKED_FILES": 1
  },
  "Host": {
    "LocalHttpPort": 5181,
    "CORS": "*"
  }
}

我不确定我在这里错过了什么。非常感谢您的帮助。