A simple .NET client wrapper for CompaniesHouse API.

CompaniesHouse.NET can be installed via the package manager console by executing the following commandlet:

PM> Install-Package CompaniesHouse

Once we have the package installed, we can then create a CompaniesHouseSettings with a ApiKey which can be created via the CompaniesHouse API website

var settings = new CompaniesHouseSettings(apiKey);

We need to now create a CompaniesHouseClient - passing in the settings that we've just created.

using(var client = new CompaniesHouseClient(settings))
{
    // Do some work...
}

This is the object we'll use going forward for any interaction to the CompaniesHouse API, but don't forget to call Dispose after you've finish (or wrap in a using block).

If you're using ASP.NET Core you can configure the IoC container with one simple extention method call. But first you'll need to install the CompaniesHouse.Extensions.Microsoft.DependencyInjection NuGet package.

PM> Install-Package CompaniesHouse.Extensions.Microsoft.DependencyInjection

Once installed, in your Startup class in the ConfigureServices method, call the AddCompaniesHouseClient method on the services object.

public void ConfigureServices(IServiceCollection services)
{
    // ...
    services.AddCompaniesHouseClient("Your API Key");
}

This will then register a range of interfaces in to the IoC container that can be injected in to any of your dependancies. A list of these can be found in the ServiceCollectionExtensionsTests.

For example if we wanted to use the ICompaniesHouseClient which is the main facade interface, we could inject this in to our page model.

public class MyPageModel : PageModel
{
    private readonly ICompaniesHouseClient _client;

    public Index2Model(ICompaniesHouseClient client)
    {
        _client = client;            
    }
}

Under the hood this is using typed clients for the HttpClient used by CompaniesHouse.NET and it's also possible to use this package with any dependency injection framework that implements Microsoft.Extensions.DependencyInjection.Abstractions.

To search for a resource, we first need to create a SearchRequest with details of the search we require.

var request = new SearchRequest()
{
    Query = "Jay2Base",
    StartIndex = 10,
    ItemsPerPage = 10
};

We can then pass the SearchRequest object in to the SearchAllAsync method and await on the task, this will then return all related resources.

var result = await client.SearchAllAsync(request);

foreach (var item in _result.Data.Items)
{
    // Do something...
}

If we need to be more precise on the resources we require, we can then pass the request object in to the required search method, either SearchCompanyAsync or SearchOfficerAsync or SearchDisqualifiedOfficerAsync and await on the task.

var result1 = await client.SearchCompanyAsync(request);

var result2 = await client.SearchOfficerAsync(request);

var result3 = await client.SearchDisqualifiedOfficerAsync(request);

To get a company profile, we pass a company number in to the GetCompanyProfileAsync method and await on the task.

var result = await client.GetCompanyProfileAsync("10440441");

If there was no match for that company number then null will be returned.

To get a list of officers for a company, we pass a company number in to the GetOfficersAsync method and await on the task.

var result = await client.GetOfficersAsync("03977902");

We can also pass in some optional parameters of startIndex and pageSize which will allow us to page the results.

var result = await client.GetOfficersAsync("03977902", 10, 10);

To get a list of the filing history for a company, we can pass a company number to the GetCompanyFilingHistoryAsync method and await on the task.

var result = await client.GetCompanyFilingHistoryAsync("10440441");

We can also pass in some optional parameters of startIndex and pageSize which will allow us to page the results.

var result = await client.GetCompanyFilingHistoryAsync("10440441", 10, 10);

To get the insolvency information for a company, we can pass a company number to the GetCompanyInsolvencyInformationAsync method and await on the task.

var result = await client.GetCompanyInsolvencyInformationAsync("10440441");

If there was no insolvency information for the given company number then null will be returned.

To get the metadata for a document, we can pass document id to the GetDocumentMetadataAsync method and await on the task.

var result = await client.GetDocumentMetadataAsync("FIxRR8teCKodjkBLRDHv2Cb8y0-nQ7T5G3BEXfWtOu4");

If there was no document metadata for the given document id then null will be returned.

To download a document, we can pass document id to the DownloadDocumentAsync method and await on the task.

var result = await client.DownloadDocumentAsync("FIxRR8teCKodjkBLRDHv2Cb8y0-nQ7T5G3BEXfWtOu4");

If there was no document for the given document id then null will be returned.

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In order for the integration tests to run, you need an API Key from CompaniesHouse API website Setup API Key in an environment variable called "api_key", and then run the tests.