launch.json

{
   // Use IntelliSense to find out which attributes exist for C# debugging
   // Use hover for the description of the existing attributes
   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
   "version": "0.2.0",
   "configurations": [
        {
            "env": {
                // Note: Any setting made in this file will override the operating system environment variable of that name.

                // See https://docs.microsoft.com/aspnet/core/fundamentals/environments
                "ASPNETCORE_ENVIRONMENT": "Development",

                // Required environment variables used in appsettings.ini
                // For additonal optional settings, refer to comments in appsettings.ini
                "PCS_IOTHUB_CONNSTRING": "your Azure IoT Hub connection string",
                "PCS_STORAGEADAPTER_WEBSERVICE_URL": "http://localhost:9022/v1",
                "PCS_STORAGEADAPTER_DOCUMENTDB_CONNSTRING": "your DocumentDb connection string",
                "PCS_AZURE_STORAGE_ACCOUNT": "your Azure Storage Account connection string",
                "PCS_RESOURCE_GROUP_LOCATION": "your Azure resource group location",
                "PCS_VMSS_NAME": "your vm scale set name",

                // Optional environment variables used in appsettings.ini
                // For additonal optional settings, refer to comments in appsettings.ini
                "PCS_LOG_LEVEL": "Debug",
                "PCS_AUTH_REQUIRED": "false",
                "PCS_AUTH_ISSUER": "",
                "PCS_AUTH_AUDIENCE": "",
                "PCS_CORS_WHITELIST": "",
                "PCS_SUBSCRIPTION_DOMAIN": "",
                "PCS_SUBSCRIPTION_ID": "",
                "PCS_RESOURCE_GROUP": "",
                "PCS_IOHUB_NAME": "",
                "PCS_SEED_TEMPLATE": ""
            },
            "stopAtEntry": false,
            "justMyCode":false,
            "enableStepFiltering": true,
            "name": "Run Service",
            "launchBrowser": {
                "enabled": false,
                "args": "${auto-detect-url}",
                "windows": {
                    "command": "cmd.exe",
                    "args": "/C start ${auto-detect-url}"
                },
                "osx": {
                    "command": "open"
                },
                "linux": {
                    "command": "xdg-open"
                }
            },
            "type": "coreclr",
            "request": "launch",
            "preLaunchTask": "build",
            "program": "${workspaceRoot}/WebService/bin/Debug/netcoreapp2.0/Microsoft.Azure.IoTSolutions.DeviceSimulation.WebService.dll",
            "args": [],
            "cwd": "${workspaceRoot}/WebService/bin/Debug/netcoreapp2.0",
            // For more information about the 'console' field, see https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md#console-terminal-window
            "console": "integratedTerminal",
            "internalConsoleOptions": "openOnSessionStart"
        },
        {
            "name": ".NET Core Attach",
            "type": "coreclr",
            "request": "attach",
            "processId": "${command:pickProcess}"
        }
    ]
}