Question

我有以下设置：

{
  "AppSettings": {
    "ConnectionString": "mongodb://localhost:27017",
    "Database": "local",
    "ValidOrigins": [ "http://localhost:61229" ]
  },
  "Logging": {
    "IncludeScopes": false,
    "Debug": {
      "LogLevel": {
        "Default": "Warning"
      }
    },
    "Console": {
      "LogLevel": {
        "Default": "Warning"
      }
    }
  }
}

我做绑定：

    services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));

我有以下设置文件：


    public class AppSettings
    {
        public string ConnectionString = "";
        public string Database = "";

        public List<string> ValidOrigins { get; set; }
    }

进行绑定：

    AppSettings settings = new AppSettings();
    Configuration.GetSection("AppSettings").Bind(settings);

settings.ValidOrigins没问题，但ConnectionString和Database都是null。我做错了什么？

Answer 1

绑定器只绑定属性而不绑定字段。尝试使用属性而不是ConnectionString和Database的字段。

public string ConnectionString { get; set; }

public string Database { get; set; }

Answer 2

正如'Henk'所说，你需要使用属性而不是字段。我在我的机器上运行你的代码，除了纠正的属性问题。它适用于以下类结构：

public class AppSettings
{
    public string ConnectionString { get; set; }
    public string Database { get; set; }
    public List<string> ValidOrigins { get; set; }
}

Answer 3

还要确保您的属性未被意外地定义为自动属性：

// ❌ WRONG

public class Configuration {
   public string Database { get; }
}


// ✅ CORRECT

public class Configuration {
   public string Database { get; set; }    // <----- Property must have a public setter
}

配置绑定不起作用

3 个答案: