範例：使用 LINQ 搭配條件運算子擷取多個項目
發行︰ 2017年1月
適用於： 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 365 (線上和內部部署)。下載 Microsoft Dynamics CRM SDK 套件。 可以在下列位置的下載套件中找到：
SampleCode\CS\GeneralProgramming\Queries\RetrieveMultipleConditionOperatorsLinq.cs
需求
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
此範例顯示如何使用 .NET Language-Integrated Query (LINQ) 擷取多個條件運算子。
範例
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"
&& (c.Address1_Telephone1.StartsWith("(206)") ||
c.Address1_Telephone1.StartsWith("(425)"))
&& (c.Address1_City == "Redmond" ||
c.Address1_City == "Bellevue" ||
c.Address1_City == "Kirkland" ||
c.Address1_City == "Seattle")
&& (c.EMailAddress1 != null && 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
}
}
另請參閱
OrganizationServiceContext
建立與 LINQ (.NET Language Integrated Query) 的查詢
範例：其他 LINQ 查詢範例
Microsoft Dynamics 365
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