Visual studio 2015 在VS代码上运行asp.net core时，Configuration.GetConnectionString返回null，但在Visual Studio上则返回罚款

这是我的appsettings.json文件

{
  "ConnectionStrings": {
    "DefaultConnection": "Host=localhost;Port=5432;Database=db;User ID=postgres;Password=root"
  },
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    }
  }
}

以下是检索连接字符串的方式：

// Only works when run through visual studio not on vs code
Configuration.GetConnectionString("DefaultConnection")

Mylaunch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": ".NET Core Launch (web)",
            "type": "coreclr",
            "request": "launch",
            "preLaunchTask": "build",
            "program": "${workspaceRoot}\\src\\Chlx\\bin\\Debug\\netcoreapp1.0\\Chlx.dll",
            "args": [],
            "cwd": "${workspaceRoot}",
            "stopAtEntry": false,
            "internalConsoleOptions": "openOnSessionStart",
            "launchBrowser": {
                "enabled": true,
                "args": "${auto-detect-url}",
                "windows": {
                    "command": "cmd.exe",
                    "args": "/C start ${auto-detect-url}"
                },
                "osx": {
                    "command": "open"
                },
                "linux": {
                    "command": "xdg-open"
                }
            },
            "env": {
                "ASPNETCORE_ENVIRONMENT": "Development"
            },
            "sourceFileMap": {
                "/Views": "${workspaceRoot}/Views"
            }
        },
        {
            "name": ".NET Core Attach",
            "type": "coreclr",
            "request": "attach",
            "processId": "${command.pickProcess}"
        }
    ]
}

{
    "version": "0.1.0",
    "command": "dotnet",
    "isShellCommand": true,
    "args": [],
    "tasks": [
        {
            "taskName": "build",
            "args": [
                "${workspaceRoot}\\src\\Chlx\\project.json"
            ],
            "isBuildCommand": true,
            "problemMatcher": "$msCompile"
        }
    ]
}

Mytasks.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": ".NET Core Launch (web)",
            "type": "coreclr",
            "request": "launch",
            "preLaunchTask": "build",
            "program": "${workspaceRoot}\\src\\Chlx\\bin\\Debug\\netcoreapp1.0\\Chlx.dll",
            "args": [],
            "cwd": "${workspaceRoot}",
            "stopAtEntry": false,
            "internalConsoleOptions": "openOnSessionStart",
            "launchBrowser": {
                "enabled": true,
                "args": "${auto-detect-url}",
                "windows": {
                    "command": "cmd.exe",
                    "args": "/C start ${auto-detect-url}"
                },
                "osx": {
                    "command": "open"
                },
                "linux": {
                    "command": "xdg-open"
                }
            },
            "env": {
                "ASPNETCORE_ENVIRONMENT": "Development"
            },
            "sourceFileMap": {
                "/Views": "${workspaceRoot}/Views"
            }
        },
        {
            "name": ".NET Core Attach",
            "type": "coreclr",
            "request": "attach",
            "processId": "${command.pickProcess}"
        }
    ]
}

{
    "version": "0.1.0",
    "command": "dotnet",
    "isShellCommand": true,
    "args": [],
    "tasks": [
        {
            "taskName": "build",
            "args": [
                "${workspaceRoot}\\src\\Chlx\\project.json"
            ],
            "isBuildCommand": true,
            "problemMatcher": "$msCompile"
        }
    ]
}

---

您知道如何解决此问题吗？

您可以从根目录（解决方案级别）而不是从项目运行程序。将launchsettings.json中的“cwd”更改为${workspaceRoot}\src\Chlx\

配置属性在Startup类中定义，并通过依赖项注入进行初始化。下面是使用dotnet新建mvc-au创建的项目的示例

  public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

---

您是如何通过VS代码“运行”它的？我是通过调试窗格“.Net核心启动（Web）”运行它的。我可以设置断点，并且获取连接字符串的方法在vs code上返回null。如何在启动时设置配置？请检查launchSettings.json中的

environmentVariables

。请检查我的编辑。我添加了launch.json和tasks.json。您是一个了不起的人，或者将applicationsettings.json添加到根文件夹中。在ASP.NETCore2.0中，我有两个项目：WebApi和DataAccess。WebApi包含appsettings.json。在父目录（包含两个项目）中，它是解决方案文件。我也经历过同样的问题：在解决方案级别复制appsettings.json，或者从WebApi项目运行app，所有这些都解决了我的问题