How to get two key values of the configuration JSON using GetSection-CodePudding

I have the following JSON format in my appsetting:

      "AzureServiceBusTopic": {
        "TopicsToConsume": [

          {
            "SubscriptionName": "sub1",
            "TopicName": "topic1"
          },
          {
            "SubscriptionName": "sub2",
            "TopicName": "topic2"
          }
        ]

      }

Currently I'm getting SubscriptionName and TopicName separately:

var topicToConsumeConfig = this.configuration.GetSection("AzureServiceBusTopic:TopicsToConsume").GetChildren();
this.topicToConsume = topicToConsumeConfig.Select(x => x.GetSection("TopicsToConsume").Value);
this.subscriptionName = topicToConsumeConfig.Select(x => x.GetSection("SubscriptionName").Value);

But I need to have the first subscriptionName and topicName together, for the second one likewise. How can I get it?

I want to get these two:

      [0]:  {
            "SubscriptionName": "sub1",
            "TopicName": "topic1"
          },


      [1]:  {
            "SubscriptionName": "sub2",
            "TopicName": "topic2"
          }

CodePudding user response：

You can do something like this:

    private static List<T> GetList<T>(IConfiguration configuration, string configSection, string keyName)
    {
        var result = new List<T>();
        configuration.GetSection($"{configSection}:{keyName}").Bind(result);
        return result;
    }

then you can call it like this:

var myListOfTopics = GetList<TopicToConsume>(this.configuration, "AzureServiceBusTopic", "TopicsToConsume");

Obviously you need to create a class to hold the "Topic" object like this:

public class TopicToConsume
{
    public string SubscriptionName { get; set; }
    public string TopicName { get; set; }
}

You might need to reference nuget Microsoft.Extensions.Configuration.Binder

which gives you access to the Bind extension method.

Also notice that because of the object is a json array [] it comes out as a a List.

But in any case with this code you can pull the whole "list of topics" in one single GetSection call

BONUS:

You can use the same technique to bind dictionaries. So you can really get complex with it.

I made it into a static method that can easily be turned into an extension method.

CodePudding user response：

try this

var items = Configuration
                    .GetSection("AzureServiceBusTopic:TopicsToConsume")
                    .Get<Dictionary<string, string>[]>()
                    .Select(l => new { SubscriptionName = l.Values.ElementAt(0), 
                                             TopicName = l.Values.ElementAt(1) });

output

[
{SubscriptionName:"sub1",TopicName:"topic1"},
{SubscriptionName:"sub2",TopicName:"topic2"}
]

or if you have some time and space, you can create a class and use typed object

IEnumerable<Names> items = Configuration
                    .GetSection("AzureServiceBusTopic:TopicsToConsume")
                    .Get<Dictionary<string, string>[]>()
                    .Select(l => new Names { SubscriptionName = l.Values.ElementAt(0), 
                                             TopicName = l.Values.ElementAt(1) });

class

public class Names
    {
        public string SubscriptionName { get; set; }
        public string TopicName { get; set; }
    }