範例：Windows 8 桌面現代 OData 應用程式

文章
03/04/2017

發佈日期： 2017年1月

適用對象： Dynamics 365 (online)、Dynamics 365 (on-premises)、Dynamics CRM 2016、Dynamics CRM Online

這個範例程式碼適用於 Microsoft Dynamics CRM 2015 和 Microsoft Dynamics CRM Online 2015 更新。您可以在下列下載套件找到此程式碼：

SampleCode\CS\ModernAndMobileApps\ModernOdataApp

需求

此範例需要 Microsoft.Preview.WindowsAzure.ActiveDirectory.Authentication 和 Microsoft.IdentityModel.Clients.ActiveDirectory NuGet 套件。載入專案的解決方案時，這些套件會自動下載和安裝。

如需執行此 SDK 所提供範例程式碼的需求資訊，請參閱使用範例和 Helper 程式碼。

示範

範例應用程式的圖標並排使用者介面

此範例顯示如何撰寫 Windows 8.1 桌面現代應用程式，可以傳送要求至組織 Web 服務，且不用連結 SDK 組件。此範例使用 Microsoft Azure Active Directory Authentication Library (ADAL) 和 OData 通訊協定。

雖然在主要應用程式頁面上顯示七個圖標，但是只有客戶與工作圖標已連接至事件處理常式程式碼。其他圖標是預留位置。

範例程式碼是設定要使用於 Microsoft Dynamics 365 (線上) 伺服器和虛擬組織，但也適用於 IFD 伺服器。

顯示完整範例的主要區段的程式碼片段在本主題後面顯示。

範例

下列程式碼片段會顯示如何使用組織 Web 服務驗證使用者。


using Microsoft.IdentityModel.Clients.ActiveDirectory;
using System;
using System.Threading.Tasks;
using Windows.UI.Popups;
using Windows.Security.Authentication.Web;
using System.Net;
using System.Threading;
using System.IO;
using System.Text;

namespace ModernOdataApp
{
    /// <summary>
    /// Manages authentication with the organization web service.
    /// </summary>
    public static class CurrentEnvironment
    {
        # region Class Level Members

        private static AuthenticationContext _authenticationContext;

        // TODO Set these string values as approppriate for your app registration and organization.
        // For more information, see the SDK topic "Walkthrough: Register an app with Active Directory".
        private const string _clientID = "893262be-fbdc-4556-9325-9f863b69495b";
        public const string CrmServiceUrl = "https://my-domain.crm.dynamics.com/";

        # endregion

        // <summary>
        /// Perform any required app initialization.
        /// This is where authentication with Active Directory is performed.
        public static async Task<string> Initialize()
        {
            Uri serviceUrl = new System.Uri(CrmServiceUrl + "/XRMServices/2011/Organization.svc/web?SdkClientVersion=6.1.0000.0000");

            // Dyamics CRM Online OAuth URL.
            string _oauthUrl = DiscoveryAuthority(serviceUrl);

            // Obtain the redirect URL for the app. This is only needed for app registration.
            Uri redirectUri = WebAuthenticationBroker.GetCurrentApplicationCallbackUri();

            // Obtain an authentication token to access the web service. 
            _authenticationContext = new AuthenticationContext(_oauthUrl, false);
            AuthenticationResult result = await _authenticationContext.AcquireTokenAsync(CrmServiceUrl, _clientID, redirectUri);

            // Verify that an access token was successfully acquired.
            if (result.Status != AuthenticationStatus.Success)
            {
                if (result.Error == "authentication_failed")
                {
                    // Try again.
                    _authenticationContext = new AuthenticationContext(_oauthUrl, false);
                    result = await _authenticationContext.AcquireTokenAsync(CrmServiceUrl, _clientID, redirectUri);
                }
                else
                {
                    DisplayErrorWhenAcquireTokenFails(result);
                }
            }
            return result.AccessToken;
        }

        /// <summary>
        /// Discover the authentication authority.
        /// </summary>
        /// <param name="serviceUrl">The URL of the organization's SOAP endpoint. </param>
        /// <returns>The authority URL.</returns>
        /// <remarks>The service URL must contain the SdkClient property.</remarks>
        /// <example>https://contoso.crm.dynamics.com/XRMServices/2011/Organization.svc/web?SdkClientVersion=6.1.0.533;</example>
        public static string DiscoveryAuthority(Uri serviceUrl)
        {
            // Use AuthenticationParameters to send a request to the organization's endpoint and
            // receive tenant information in the 401 challenge. 
            Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationParameters parameters = null;
            HttpWebResponse response = null;
            try
            {
                // Create a web request where the authorization header contains the word "Bearer".
                HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(serviceUrl);

                // The response is to be encoded.
                httpWebRequest.ContentType = "application/x-www-form-urlencoded";
                response = (HttpWebResponse)httpWebRequest.GetResponse();
            }

            catch (WebException ex)
            {
                response = (HttpWebResponse)ex.Response;

                // A 401 error should be returned. Extract any parameters from the response.
                // The response should contain an authorization_uri parameter.
                parameters = Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationParameters.
                    CreateFromResponseAuthenticateHeader((response.Headers)["WWW-Authenticate"]);
            }
            finally
            {
                if (response != null)
                    response.Dispose();
            }
            // Return the authority URL.
            return parameters.Authority;
        }

        /// <summary>
        /// Returns a response from an Internet resource. 
        /// </summary>       
        public static WebResponse GetResponse(this WebRequest request)
        {
            AutoResetEvent autoResetEvent = new AutoResetEvent(false);
            IAsyncResult asyncResult = request.BeginGetResponse(r => autoResetEvent.Set(), null);

            // Wait until the call is finished
            autoResetEvent.WaitOne(DefaultRequestTimeout);
            return request.EndGetResponse(asyncResult);
        }

        /// <summary>
        /// Get the DefaultRequestTimeout from the server.
        /// </summary>
        public static TimeSpan DefaultRequestTimeout { get; set; }

        /// <summary>
        /// Display an error message to the user.
        /// </summary>
        /// <param name="result">The authentication result returned from AcquireTokenAsync().</param>
        private static async void DisplayErrorWhenAcquireTokenFails(AuthenticationResult result)
        {
            MessageDialog dialog;

            switch (result.Error)
            {
                case "authentication_canceled":
                    // User cancelled, so no need to display a message.
                    break;
                case "temporarily_unavailable":
                case "server_error":
                    dialog = new MessageDialog("Please retry the operation. If the error continues, please contact your administrator.",
                        "Sorry, an error has occurred.");
                    await dialog.ShowAsync();
                    break;
                default:
                    // An error occurred when acquiring a token so show the error description in a MessageDialog.
                    dialog = new MessageDialog(string.Format(
                        "If the error continues, please contact your administrator.\n\nError: {0}\n\nError Description:\n\n{1}",
                        result.Error, result.ErrorDescription), "Sorry, an error has occurred.");
                    await dialog.ShowAsync();
                    break;
            }
        }
    }
}

若要執行此程式碼，必須先使用支援的身分識別提供者 (AD FS 或 Microsoft Azure Active Directory) 註冊應用程式。接下來，您必須在程式碼中設定 _clientID 和 CrmServiceUrl 的值。用戶端識別碼的值在應用程式註冊時定義。其他資訊：逐步解說：向 Active Directory 註冊 Dynamics 365 應用程式

範例

下列程式碼片段會顯示如何在 HTTP 要求中使用 OData 通訊協定碼，從組織 Web 服務擷取實體記錄。驗證存取 token 放置在授權標題中。


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

namespace ModernOdataApp
{
    public static class HttpRequestBuilder
    {
        /// <summary>
        /// Retrieve entity record data from the organization web service. 
        /// </summary>
        /// <param name="accessToken">The web service authentication access token.</param>
        /// <param name="Columns">The entity attributes to retrieve.</param>
        /// <param name="entity">The target entity for which the data should be retreived.</param>
        /// <returns>Response from the web service.</returns>
        /// <remarks>Builds an OData HTTP request using passed parameters and sends the request to the server.</remarks>
        public static async Task<string> Retrieve(string accessToken, string[] Columns, string entity)
        {
            // Build a list of entity attributes to retrieve as a string.
            string columnsSet = "";
            foreach (string Column in Columns)
            {
                columnsSet += "," + Column;
            }

            // The URL for the OData organization web service.
            string url = CurrentEnvironment.CrmServiceUrl + "/XRMServices/2011/OrganizationData.svc/" + entity + "?$select=" + columnsSet.Remove(0, 1) + "";

            // Build and send the HTTP request.
            HttpClient httpClient = new HttpClient();
            httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
            HttpRequestMessage req = new HttpRequestMessage(HttpMethod.Get, url);
            req.Method = HttpMethod.Get;

            // Wait for the web service response.
            HttpResponseMessage response;
            response = await httpClient.SendAsync(req);
            var responseBodyAsText = await response.Content.ReadAsStringAsync();

            return responseBodyAsText;
        }
    }
}

另請參閱

建立新型行動應用程式
 Windows 市集的 Azure 驗證程式庫 (AAL)：深入了解分析
 使用 Azure AD 保護 Windows 市集應用程式和 REST Web 服務
 OData.org

Microsoft Dynamics 365

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範例：Windows 8 桌面現代 OData 應用程式

需求

示範

範例

範例

另請參閱

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