IConfiguration functionality in C#-CodePudding

I'm reading through some code someone wrote and I'm trying to understand it. the code looks like this.

public LocalFileStorageHandler(AftermarketDbContext dbContext, IConfiguration configuration, ILogger<LocalFileStorageHandler> logger)
        {
            _db = dbContext;


            var runDataFolder = configuration["MountPoints:RunData"];
}

for privacy I have only posted a short section of the method. Now my question is what does the last line of code do?

when i console print runDataFolder it gives me a directory address. No idea where this came from what the mountpoints part does, why its square brackets around it.

Any one got some insight?

CodePudding user response：

It means that you have appsettings.json file in a root of the web application. Or it can be appsettings.Environment.json : for example, the appsettings.Production.json or(and) appsettings.Development.json files. You can access a configuration value using the IConfiguration service. In your example this service is injected in the constructor.

There is a json fragment like this inside of this file

"MountPoints": {
    "RunData": "....directory address",
      .....
},