从appsettings.json获取ConnectionStrings配置设置 [英] Getting ConnectionStrings config settings from appsettings.json

问题描述

在我的存储库类中，我有我的Config对象，看起来我的连接字符串在以下位置:

In my repository class, I have my Config object and looks like my connection string is under:

Config > Providers > Microsoft.Configuration.Json.JsonConfigurationProvider > Data > ConnectionStrings.myConnectionString

这是我的appsettings.json的样子:

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "ConnectionStrings": {
    "myConnectionString": details..."
  }
}

我正在尝试按以下方式阅读myConnectionString:

I'm trying to read myConnectionString as follows which is not working:

var cs = _config.GetSection("ConnectionStrings.myConnectionString").value;

我在做什么错了?

更新: 由于某种原因，我没有看到GetValue()方法.我正在使用ASP.NET Core 2.0.

UPDATE: For some reason, I'm not seeing GetValue() method. I'm using ASP.NET Core 2.0.

推荐答案

问题似乎出在传递给GetSection()方法的字符串路径上.根据 ASP .NET Core配置文档，您应该使用"ConnectionStrings:myConnectionString"而不是"ConnectionStrings.myConnectionString".

The issue seems to lie in the string path you are passing to the GetSection() method. According to the ASP.NET Core Configuration documentation you should use "ConnectionStrings:myConnectionString" instead of "ConnectionStrings.myConnectionString".

此外，如果您希望直接检索该值，则可能更喜欢使用GetValue()方法:

Plus, if you wish to retrieve the value directly you may prefer to use the GetValue() method instead:

var cs = _config.GetValue("ConnectionStrings:myConnectionString", "");

如果愿意，也可以将索引符号用作:

If you prefer, you can also use the index notation as:

var cs = _config["ConnectionStrings:myConnectionString"];

但是，老实说，我发现第一种方法更加简洁明了，因为GetValue()方法允许您指定默认值，以防在配置中找不到该属性.

But I honestly find the first approach more clean and elegant as the GetValue() method allows you to specify a default value in case the property is not found in the configuration.

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