示例：检索交叉表的记录：
发布日期： 2017年1月
适用于： Dynamics 365 (online),Dynamics 365 (on-premises),Dynamics CRM 2016,Dynamics CRM Online
此示例代码适用于 Microsoft Dynamics 365（在线或本地）。下载 Microsoft Dynamics CRM SDK 包。 它可能位于下载包的以下位置：
SampleCode\CS\GeneralProgramming\Queries\RetrieveRecordsFromAnIntersectTable.cs
要求
有关运行此 SDK 中提供的示例代码的要求的详细信息，请参阅使用示例和帮助程序代码。
示例
此示例演示如何从相交表检索记录：
using System;
using System.Text;
using System.Linq;
using System.Xml.Linq;
using System.ServiceModel;
// These namespaces are found in the Microsoft.Xrm.Sdk.dll assembly
// found in the SDK\bin folder.
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Client;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Xrm.Sdk.Messages;
// This namespace is found in Microsoft.Crm.Sdk.Proxy.dll assembly
// found in the SDK\bin folder.
using Microsoft.Crm.Sdk.Messages;
namespace Microsoft.Crm.Sdk.Samples
{
/// <summary>
/// Demonstrates how to retrieve records from an intersect table.
/// </summary>
public class RetrieveRecordsFromAnIntersectTable
{
#region Class Level Members
private Guid _userId;
private Guid _roleId;
private OrganizationServiceProxy _serviceProxy;
#endregion Class Level Members
#region How-To Sample Code
/// <summary>
/// This method first connects to the Organization service. Afterwards,
/// records are retrieved from the systemuserroles intersect table via three
/// methods: Query Expression, Fetch, and LINQ.
/// </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();
CreateRequiredRecords();
#region Retrieve records from an intersect table via QueryExpression
//Create Query Expression.
QueryExpression query = new QueryExpression()
{
EntityName = "role",
ColumnSet = new ColumnSet("name"),
LinkEntities =
{
new LinkEntity
{
LinkFromEntityName = Role.EntityLogicalName,
LinkFromAttributeName = "roleid",
LinkToEntityName = SystemUserRoles.EntityLogicalName,
LinkToAttributeName = "roleid",
LinkCriteria = new FilterExpression
{
FilterOperator = LogicalOperator.And,
Conditions =
{
new ConditionExpression
{
AttributeName = "systemuserid",
Operator = ConditionOperator.Equal,
Values = { _userId }
}
}
}
}
}
};
// Obtain results from the query expression.
EntityCollection ec = _serviceProxy.RetrieveMultiple(query);
// Display results.
for (int i = 0; i < ec.Entities.Count; i++)
{
Console.WriteLine("Query Expression Retrieved: {0}", ((Role)ec.Entities[i]).Name);
}
#endregion
#region Retrieve records from an intersect table via Fetch
// Setup Fetch XML.
StringBuilder linkFetch = new StringBuilder();
linkFetch.Append("<fetch version=\"1.0\" output-format=\"xml-platform\" mapping=\"logical\" distinct=\"true\">");
linkFetch.Append("<entity name=\"role\">");
linkFetch.Append("<attribute name=\"name\"/>");
linkFetch.Append("<link-entity name=\"systemuserroles\" from=\"roleid\" to=\"roleid\" visible=\"false\" intersect=\"true\">");
linkFetch.Append("<filter type=\"and\">");
linkFetch.Append("<condition attribute=\"systemuserid\" operator=\"eq\" value=\"" + _userId + "\"/>");
linkFetch.Append("</filter>");
linkFetch.Append("</link-entity>");
linkFetch.Append("</entity>");
linkFetch.Append("</fetch>");
// Build fetch request and obtain results.
RetrieveMultipleRequest efr = new RetrieveMultipleRequest()
{
Query = new FetchExpression(linkFetch.ToString())
};
EntityCollection entityResults = ((RetrieveMultipleResponse)_serviceProxy.Execute(efr)).EntityCollection;
// Display results.
foreach (var e in entityResults.Entities)
{
Console.WriteLine("Fetch Retrieved: {0}", e.Attributes["name"]);
}
#endregion
#region Retrieve records from an intersect table via LINQ
// Obtain the Organization Context.
OrganizationServiceContext context = new OrganizationServiceContext(_serviceProxy);
// Create Linq Query.
var roles = (from r in context.CreateQuery<Role>()
join s in context.CreateQuery<SystemUserRoles>() on r.RoleId equals s.RoleId
where s.SystemUserId == _userId
orderby r.RoleId
select r.Name);
// Display results.
foreach (var role in roles)
{
Console.WriteLine("Linq Retrieved: {0}", role);
}
#endregion
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()
{
// Retrieve the default business unit needed to create the team.
QueryExpression queryDefaultBusinessUnit = new QueryExpression
{
EntityName = BusinessUnit.EntityLogicalName,
ColumnSet = new ColumnSet("businessunitid"),
Criteria = new FilterExpression()
};
// Execute the request.
queryDefaultBusinessUnit.Criteria.AddCondition("parentbusinessunitid",
ConditionOperator.Null);
BusinessUnit defaultBusinessUnit = (BusinessUnit)_serviceProxy.RetrieveMultiple(
queryDefaultBusinessUnit).Entities[0];
// Get the GUID of the current user.
WhoAmIRequest who = new WhoAmIRequest();
WhoAmIResponse whoResp = (WhoAmIResponse)_serviceProxy.Execute(who);
_userId = whoResp.UserId;
// Instantiate a role entity record and set its property values.
// See the Entity Metadata topic in the SDK documentation to determine
// which attributes must be set for each entity.
Role setupRole = new Role
{
Name = "ABC Management Role",
BusinessUnitId = new EntityReference(BusinessUnit.EntityLogicalName,
defaultBusinessUnit.Id)
};
//Create a role record.
_roleId = _serviceProxy.Create(setupRole);
Console.WriteLine("Created Role.");
// Assign User to Managers role.
AssociateRequest associate = new AssociateRequest()
{
Target = new EntityReference(SystemUser.EntityLogicalName, _userId),
RelatedEntities = new EntityReferenceCollection()
{
new EntityReference(Role.EntityLogicalName, _roleId),
},
Relationship = new Relationship("systemuserroles_association")
};
// Execute the request.
_serviceProxy.Execute(associate);
}
/// <summary>
/// Deletes any entity records and files 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 deleteRecords = true;
if (prompt)
{
Console.WriteLine("\nDo you want these entity records deleted? (y/n) [y]: ");
String answer = Console.ReadLine();
deleteRecords = (answer.StartsWith("y") || answer.StartsWith("Y") || answer == String.Empty);
}
if (deleteRecords)
{
_serviceProxy.Delete(Role.EntityLogicalName, _roleId);
Console.WriteLine("Entity records 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();
RetrieveRecordsFromAnIntersectTable app = new RetrieveRecordsFromAnIntersectTable();
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
}
}
另请参阅
IOrganizationService
RetrieveMultiple
FetchExpression
RetrieveMultipleRequest
RetrieveMultiple
使用交叉实体检索多对多关系的记录
使用 FetchXML 构建查询
帮助程序代码：ServerConnection 类
Microsoft Dynamics 365
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