使用代码从Dynamics365获取所有实体

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

class Program
{
    static async Task Main(string[] args)
    {
        string dynamics365Url = "https://your-dynamics365-instance-url/api/data/v9.1/";

        using (HttpClient client = new HttpClient())
        {
            client.BaseAddress = new Uri(dynamics365Url);
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            // Replace with your Dynamics365 credentials
            string username = "your-username";
            string password = "your-password";

            // Authenticate
            string token = await GetAuthToken(client, username, password);

            // Get all entities
            string entitiesUrl = "EntityDefinitions";
            HttpResponseMessage response = await client.GetAsync(entitiesUrl);
            if (response.IsSuccessStatusCode)
            {
                var entities = await response.Content.ReadAsAsync<EntityCollection>();
                foreach (var entity in entities.Value)
                {
                    Console.WriteLine(entity.LogicalName);
                }
            }
            else
            {
                Console.WriteLine("Failed to retrieve entities. Status code: " + response.StatusCode);
            }
        }
    }

    static async Task<string> GetAuthToken(HttpClient client, string username, string password)
    {
        string tokenUrl = "https://login.microsoftonline.com/your-tenant-id/oauth2/token";
        string clientId = "your-client-id";
        string clientSecret = "your-client-secret";

        var content = new FormUrlEncodedContent(new[]
        {
            new KeyValuePair<string, string>("grant_type", "password"),
            new KeyValuePair<string, string>("client_id", clientId),
            new KeyValuePair<string, string>("client_secret", clientSecret),
            new KeyValuePair<string, string>("username", username),
            new KeyValuePair<string, string>("password", password),
            new KeyValuePair<string, string>("resource", client.BaseAddress.ToString())
        });

        HttpResponseMessage response = await client.PostAsync(tokenUrl, content);
        if (response.IsSuccessStatusCode)
        {
            var tokenResponse = await response.Content.ReadAsAsync<TokenResponse>();
            return tokenResponse.AccessToken;
        }
        else
        {
            throw new Exception("Failed to authenticate. Status code: " + response.StatusCode);
        }
    }
}

class EntityCollection
{
    public Entity[] Value { get; set; }
}

class Entity
{
    public string LogicalName { get; set; }
}