dataverse_basic_query.cs

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;

public class DataverseBasicQueryExample
{
    public static async Task Main()
    {
        var environmentUrl = "https://yourorg.crm.dynamics.com";
        var accessToken = "YOUR_ACCESS_TOKEN";
        var requestUrl = environmentUrl + "/api/data/v9.2/accounts?$select=name,accountnumber&$filter=statecode eq 0";

        using var client = new HttpClient();
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        client.DefaultRequestHeaders.Add("OData-Version", "4.0");
        client.DefaultRequestHeaders.Add("OData-MaxVersion", "4.0");

        while (!string.IsNullOrWhiteSpace(requestUrl))
        {
            var response = await client.GetAsync(requestUrl);
            response.EnsureSuccessStatusCode();

            var content = await response.Content.ReadAsStringAsync();
            Console.WriteLine(content);

            requestUrl = null;

            var marker = "\"@odata.nextLink\":\"";
            var startIndex = content.IndexOf(marker, StringComparison.OrdinalIgnoreCase);
            if (startIndex >= 0)
            {
                startIndex += marker.Length;
                var endIndex = content.IndexOf('"', startIndex);
                if (endIndex > startIndex)
                {
                    requestUrl = content[startIndex..endIndex]
                        .Replace("\\u0026", "&")
                        .Replace("\\/", "/");
                }
            }
        }
    }
}