Sample: Retrieve multiple with condition operators using LINQ

Статья
11/28/2016
Applies To: Dynamics 365 (online), Dynamics 365 (on-premises), Dynamics CRM 2016, Dynamics CRM Online
This sample code is for Microsoft Dynamics 365 (online & on-premises). Download the Microsoft Dynamics CRM SDK package. It can be found in the following location in the download package:
SampleCode\CS\GeneralProgramming\Queries\RetrieveMultipleConditionOperatorsLinq.cs
Requirements

For more information about the requirements for running the sample code provided in this SDK, see Use the sample and helper code.
Demonstrates

This sample shows how to retrieve multiple condition operators with .NET Language-Integrated Query (LINQ).
Example


using System;
using System.ServiceModel;
using System.Collections.Generic;
using System.Linq;

// These namespaces are found in the Microsoft.Xrm.Sdk.dll assembly
// located in the SDK\bin folder of the SDK download.
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Client;

namespace Microsoft.Crm.Sdk.Samples
{
 /// <summary>
 /// Demonstrates how to do use retrieve multiple condition operators for all
 /// query types.</summary>
 /// <remarks>
 /// At run-time, you will be given the option to delete all the
 /// database records created by this program.</remarks>
 public class RetrieveMultipleConditionOperatorsLinq
 {
  #region Class Level Members

  private Guid _accountId;
  private List<Guid> _contactIdList = new List<Guid>();
  private OrganizationServiceProxy _serviceProxy;
  private IOrganizationService _service;

  #endregion Class Level Members

  #region How To Sample Code
  /// <summary>
  /// This method first connects to the Organization service. Afterwards,
  /// basic LINQ queries are performed.
  /// </summary>
  /// <param name="serverConfig">Contains server connection information.</param>
  /// <param name="promptforDelete">When True, the user will be prompted to delete all
  /// created entities.</param>
  public void Run(ServerConnection.Configuration serverConfig, bool promptforDelete)
  {
   try
   {

    // Connect to the Organization service. 
    // The using statement assures that the service proxy will be properly disposed.
    using (_serviceProxy = new OrganizationServiceProxy(serverConfig.OrganizationUri, serverConfig.HomeRealmUri,serverConfig.Credentials, serverConfig.DeviceCredentials))
    {
     // This statement is required to enable early-bound type support.
     _serviceProxy.EnableProxyTypes();

     _service = (IOrganizationService)_serviceProxy;

     CreateRequiredRecords();

     // Create the ServiceContext object that will generate
     // the IQueryable collections for LINQ calls.
     ServiceContext svcContext =
         new ServiceContext(_service);


     #region SQL Query Translated to LINQ
     // Build the following SQL query using QueryExpression:
     //
     //     SELECT contact.fullname, contact.address1_telephone1
     //     FROM contact
     //         LEFT OUTER JOIN account
     //             ON contact.parentcustomerid = account.accountid
     //             AND
     //             account.name = 'Litware, Inc.'
     //     WHERE (contact.address1_stateorprovince = 'WA'
     //     AND
     //         contact.address1_city in ('Redmond', 'Bellevue', 'Kirkland', 'Seattle')
     //     AND 
     //         contact.address1_telephone1 like '(206)%'
     //         OR
     //         contact.address1_telephone1 like '(425)%'
     //     AND
     //         contact.emailaddress1 Not NULL
     //            )
     var contacts = (from c in svcContext.ContactSet
                     join a in svcContext.AccountSet on c.ParentCustomerId.Id equals a.AccountId
                     where (a.Name == "Litware, Inc.")
                     where (c.Address1_StateOrProvince == "WA"
                     &amp;&amp; (c.Address1_Telephone1.StartsWith("(206)") ||
                         c.Address1_Telephone1.StartsWith("(425)"))
                     &amp;&amp; (c.Address1_City == "Redmond" ||
                         c.Address1_City == "Bellevue" ||
                         c.Address1_City == "Kirkland" ||
                         c.Address1_City == "Seattle")
                     &amp;&amp; (c.EMailAddress1 != null &amp;&amp; c.EMailAddress1 != ""))
                     select new Contact
                     {
                      ContactId = c.ContactId,
                      FirstName = c.FirstName,
                      LastName = c.LastName,
                      Address1_Telephone1 = c.Address1_Telephone1
                     });

     // Display the results.
     Console.WriteLine("List all contacts matching specified parameters");
     Console.WriteLine("===============================================");
     foreach (Contact contact in contacts)
     {
      Console.WriteLine("Contact ID: {0}", contact.Id);
      Console.WriteLine("Contact Name: {0}", contact.FullName);
      Console.WriteLine("Contact Phone: {0}", contact.Address1_Telephone1);
     }
     Console.WriteLine("<End of Listing>");
     Console.WriteLine();
     #endregion

     //OUTPUT:
     //List all contacts matching specified parameters
     //===============================================
     //Contact ID: a263e139-63a3-e011-aea3-00155dba3818
     //Contact Name:
     //Contact Phone: (206)555-5555
     //Contact ID: a463e139-63a3-e011-aea3-00155dba3818
     //Contact Name:
     //Contact Phone: (425)555-5555
     //<End of Listing>

     DeleteRequiredRecords(promptforDelete);
    }

   }

   // Catch any service fault exceptions that Microsoft Dynamics CRM throws.
   catch (FaultException<Microsoft.Xrm.Sdk.OrganizationServiceFault>)
   {
    // You can handle an exception here or pass it back to the calling method.
    throw;
   }
  }

  /// <summary>
  /// Creates any entity records that this sample requires.
  /// </summary>
  public void CreateRequiredRecords()
  {
   // Create an account.
   Account account = new Account
   {
    Name = "Litware, Inc."
   };
   _accountId = _service.Create(account);

   // Create the 2 contacts.
   Contact contact = new Contact()
   {
    FirstName = "Ben",
    LastName = "Andrews",
    EMailAddress1 = "sample@example.com",
    Address1_City = "Redmond",
    Address1_StateOrProvince = "WA",
    Address1_Telephone1 = "(206)555-5555",
    ParentCustomerId = new EntityReference
    {
     Id = _accountId,
     LogicalName = account.LogicalName
    }
   };
   _contactIdList.Add(_service.Create(contact));

   contact = new Contact()
   {
    FirstName = "Colin",
    LastName = "Wilcox",
    EMailAddress1 = "sample@example.com",
    Address1_City = "Bellevue",
    Address1_StateOrProvince = "WA",
    Address1_Telephone1 = "(425)555-5555",
    ParentCustomerId = new EntityReference
    {
     Id = _accountId,
     LogicalName = account.LogicalName
    }
   };
   _contactIdList.Add(_service.Create(contact));
  }

  /// <summary>
  /// Deletes any entity records that were created for this sample.
  /// <param name="prompt">Indicates whether to prompt the user 
  /// to delete the records created in this sample.</param>
  /// </summary>
  public void DeleteRequiredRecords(bool prompt)
  {
   bool toBeDeleted = true;

   if (prompt)
   {
    // Ask the user if the created entities should be deleted.
    Console.Write("\nDo you want these entity records deleted? (y/n) [y]: ");
    String answer = Console.ReadLine();
    if (answer.StartsWith("y") ||
        answer.StartsWith("Y") ||
        answer == String.Empty)
    {
     toBeDeleted = true;
    }
    else
    {
     toBeDeleted = false;
    }
   }

   if (toBeDeleted)
   {
    // Delete all records created in this sample.
    foreach (Guid contactId in _contactIdList)
    {
     _service.Delete(Contact.EntityLogicalName, contactId);
    }

    _service.Delete(Account.EntityLogicalName, _accountId);

    Console.WriteLine("Entity record(s) have been deleted.");
   }
  }

  #endregion How To Sample Code

  #region Main method

  /// <summary>
  /// Standard Main() method used by most SDK samples.
  /// </summary>
  /// <param name="args"></param>
  static public void Main(string[] args)
  {
   try
   {
    // Obtain the target organization's Web address and client logon 
    // credentials from the user.
    ServerConnection serverConnect = new ServerConnection();
    ServerConnection.Configuration config = serverConnect.GetServerConfiguration();

    RetrieveMultipleConditionOperatorsLinq app = new RetrieveMultipleConditionOperatorsLinq();
    app.Run(config, true);
   }
   catch (FaultException<Microsoft.Xrm.Sdk.OrganizationServiceFault> ex)
   {
    Console.WriteLine("The application terminated with an error.");
    Console.WriteLine("Timestamp: {0}", ex.Detail.Timestamp);
    Console.WriteLine("Code: {0}", ex.Detail.ErrorCode);
    Console.WriteLine("Message: {0}", ex.Detail.Message);
    Console.WriteLine("Plugin Trace: {0}", ex.Detail.TraceText);
    Console.WriteLine("Inner Fault: {0}",
        null == ex.Detail.InnerFault ? "No Inner Fault" : "Has Inner Fault");
   }
   catch (System.TimeoutException ex)
   {
    Console.WriteLine("The application terminated with an error.");
    Console.WriteLine("Message: {0}", ex.Message);
    Console.WriteLine("Stack Trace: {0}", ex.StackTrace);
    Console.WriteLine("Inner Fault: {0}",
        null == ex.InnerException.Message ? "No Inner Fault" : ex.InnerException.Message);
   }
   catch (System.Exception ex)
   {
    Console.WriteLine("The application terminated with an error.");
    Console.WriteLine(ex.Message);

    // Display the details of the inner exception.
    if (ex.InnerException != null)
    {
     Console.WriteLine(ex.InnerException.Message);

     FaultException<Microsoft.Xrm.Sdk.OrganizationServiceFault> fe = ex.InnerException
         as FaultException<Microsoft.Xrm.Sdk.OrganizationServiceFault>;
     if (fe != null)
     {
      Console.WriteLine("Timestamp: {0}", fe.Detail.Timestamp);
      Console.WriteLine("Code: {0}", fe.Detail.ErrorCode);
      Console.WriteLine("Message: {0}", fe.Detail.Message);
      Console.WriteLine("Plugin Trace: {0}", fe.Detail.TraceText);
      Console.WriteLine("Inner Fault: {0}",
          null == fe.Detail.InnerFault ? "No Inner Fault" : "Has Inner Fault");
     }
    }
   }
   // Additional exceptions to catch: SecurityTokenValidationException, ExpiredSecurityTokenException,
   // SecurityAccessDeniedException, MessageSecurityException, and SecurityNegotiationException.

   finally
   {
    Console.WriteLine("Press <Enter> to exit.");
    Console.ReadLine();
   }
  }
  #endregion Main method
 }
}
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Sample: Retrieve multiple with condition operators using LINQ

Requirements

Demonstrates

Example

See Also

Дополнительные ресурсы
