Classe QueryExpressionToFetchXmlRequest

Articolo
12/03/2014

Si applica 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.

Spazio dei nomi: Microsoft.Crm.Sdk.Messages
Assembly: Microsoft.Crm.Sdk.Proxy (in Microsoft.Crm.Sdk.Proxy.dll)

Sintassi

'Dichiarazione
<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

Esempio

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);

Note

Message Availability

Questo messaggio funziona indipendentemente dal fatto che il chiamante sia connesso al server o offline.

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.

Gerarchia ereditarietà

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

Thread Safety

Tutti i membri statici pubblici (Shared in Visual Basic) di questo tipo sono thread-safe. Non è garantito che i membri di istanza siano thread-safe.

Piattaforme

Piattaforme di sviluppo

Windows Vista, Windows Server 2003 e

Piattaforme di destinazione

Windows Vista,Windows XP

Change History

Vedere anche

Riferimento

Membri QueryExpressionToFetchXmlRequest
Spazio dei nomi Microsoft.Crm.Sdk.Messages
QueryExpressionToFetchXmlResponse

Altre risorse

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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