Clase de QueryExpressionToFetchXmlRequest

Artikulua
12/03/2014

Se aplica a: CRM 2015 on-prem, CRM Online

Contains the data that is needed to convert a query, which is represented as a QueryExpression class, to its equivalent query, which is represented as FetchXML.

Espacio de nombres: Microsoft.Crm.Sdk.Messages
Ensamblado: Microsoft.Crm.Sdk.Proxy (en Microsoft.Crm.Sdk.Proxy.dll)

Sintaxis

'Declaración
<DataContractAttribute(Namespace:="https://schemas.microsoft.com/crm/2011/Contracts")> _
Public NotInheritable Class QueryExpressionToFetchXmlRequest
    Inherits OrganizationRequest

[DataContractAttribute(Namespace="https://schemas.microsoft.com/crm/2011/Contracts")] 
public sealed class QueryExpressionToFetchXmlRequest : OrganizationRequest

Ejemplo

The following example shows how to use this message. For this sample to work correctly, you must be connected to the server to get an IOrganizationService interface. For the complete sample, see the link later in this topic.

// Build a query expression that we will turn into FetchXML.
var queryExpression = new QueryExpression()
{
    Distinct = false,
    EntityName = Contact.EntityLogicalName,
    ColumnSet = new ColumnSet("fullname", "address1_telephone1"),
    LinkEntities = 
        {
            new LinkEntity 
            {
                JoinOperator = JoinOperator.LeftOuter,
                LinkFromAttributeName = "parentcustomerid",
                LinkFromEntityName = Contact.EntityLogicalName,
                LinkToAttributeName = "accountid",
                LinkToEntityName = Account.EntityLogicalName,
                LinkCriteria = 
                {
                    Conditions = 
                    {
                        new ConditionExpression("name", ConditionOperator.Equal, "Litware, Inc.")
                    }
                }
            }
        },
    Criteria =
    {
        Filters = 
            {
                new FilterExpression
                {
                    FilterOperator = LogicalOperator.And,
                    Conditions = 
                    {
                        new ConditionExpression("address1_stateorprovince", ConditionOperator.Equal, "WA"),
                        new ConditionExpression("address1_city", ConditionOperator.In, new String[] {"Redmond", "Bellevue" , "Kirkland", "Seattle"}),
                        new ConditionExpression("createdon", ConditionOperator.LastXDays, 30),
                        new ConditionExpression("emailaddress1", ConditionOperator.NotNull)
                    },
                },
                new FilterExpression
                {
                    FilterOperator = LogicalOperator.Or,
                    Conditions =
                    {
                        new ConditionExpression("address1_telephone1", ConditionOperator.Like, "(206)%"),
                        new ConditionExpression("address1_telephone1", ConditionOperator.Like, "(425)%")
                    }
                }
            }
    }
};

// Run the query as a query expression.
EntityCollection queryExpressionResult =
    _serviceProxy.RetrieveMultiple(queryExpression);
Console.WriteLine("Output for query as QueryExpression:");
DisplayContactQueryResults(queryExpressionResult);

// Convert the query expression to FetchXML.
var conversionRequest = new QueryExpressionToFetchXmlRequest
{
    Query = queryExpression
};
var conversionResponse =
    (QueryExpressionToFetchXmlResponse)_serviceProxy.Execute(conversionRequest);

// Use the converted query to make a retrieve multiple request to Microsoft Dynamics CRM.
String fetchXml = conversionResponse.FetchXml;
var fetchQuery = new FetchExpression(fetchXml);
EntityCollection result = _serviceProxy.RetrieveMultiple(fetchQuery);

// Display the results.
Console.WriteLine("\nOutput for query after conversion to FetchXML:");
DisplayContactQueryResults(result);

Comentarios

Message Availability

Este mensaje funciona independientemente de si el autor de la llamada está conectado al servidor o no.

Usage

Pass an instance of this class to the Execute method, which returns an instance of the QueryExpressionToFetchXmlResponse class.

Privileges and Access Rights

For a complete list of the required privileges, see QueryExpressionToFetchXml Privileges.

Notes for Callers

Use of the keyword distinct in query expressions is different from the FetchXML query language. When you map a query from Fetch to QueryExpression, you receive inconsistent results if you use the Distinct keyword in the FetchXML string.

Jerarquía heredada

System.Object
Microsoft.Xrm.Sdk.OrganizationRequest
Microsoft.Crm.Sdk.Messages.QueryExpressionToFetchXmlRequest

Seguridad de hilo

Los miembros estáticos públicos (Shared en Visual Basic) de este tipo son seguros para el hilo. No se garantiza que los miembros de instancia sean seguros para el hilo.

Plataformas

Plataformas de desarrollo

Windows Vista, Windows Server 2003 y

Plataformas de destino

Windows Vista,Windows XP

Change History

Vea también

Referencia

Miembros de QueryExpressionToFetchXmlRequest
Espacio de nombres de Microsoft.Crm.Sdk.Messages
QueryExpressionToFetchXmlResponse

Otros recursos

Create Queries to Retrieve Data
Page Large Result Sets with Query Expression and FetchXML
Build Queries with QueryExpression
FetchXML Schema
Sample: Convert Queries Between Fetch and Query Expression

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