How to extract a list from appsettings.json in .net core

Question

I have an appsettings.json file which looks like this:

{
    \"someSetting\": {
        \"subSettings\": [
            \"one\",
            \"two\",
                 


        

Answer 1

You can use the Configuration binder to get a strong type representation of the configuration sources.

This is an example from a test that I wrote before, hope it helps:

    [Fact]
    public void BindList()
    {
        var input = new Dictionary
        {
            {"StringList:0", "val0"},
            {"StringList:1", "val1"},
            {"StringList:2", "val2"},
            {"StringList:x", "valx"}
        };

        var configurationBuilder = new ConfigurationBuilder();
        configurationBuilder.AddInMemoryCollection(input);
        var config = configurationBuilder.Build();

        var list = new List();
        config.GetSection("StringList").Bind(list);

        Assert.Equal(4, list.Count);

        Assert.Equal("val0", list[0]);
        Assert.Equal("val1", list[1]);
        Assert.Equal("val2", list[2]);
        Assert.Equal("valx", list[3]);
    }

The important part is the call to Bind.

The test and more examples are on GitHub