Use the QueryByAttribute class

Статья
11/28/2016

Applies To: Dynamics 365 (online), Dynamics 365 (on-premises), Dynamics CRM 2016, Dynamics CRM Online

In Microsoft Dynamics 365 (online & on-premises), you can use the QueryByAttribute class to build queries that test a set of attributes against a set of values. Use this class with the RetrieveMultiple method or the IOrganizationService.RetrieveMultipleRequest method.

The following table lists the properties that you can set to create a query expression using the QueryByAttribute class.

Property	Description
EntityName	Specifies which type of entity is retrieved. A query expression can only retrieve a collection of one entity type. You can also pass this value by using the QueryExpression constructor.
ColumnSet	Specifies the set of attributes (columns) to retrieve.
Attributes	Specifies the set of attributes selected in the query.
Values	Specifies the attribute values to look for when the query is executed.
Orders	Specifies the order in which the records are returned from the query.
PageInfo	Specifies the number of pages and the number of records per page returned from the query.

The following code example shows how to use the QueryByAttribute class.

//  Create query using querybyattribute    
QueryByAttribute querybyexpression = new QueryByAttribute("account");    
querybyexpression.ColumnSet = new ColumnSet("name", "address1_city", "emailaddress1");

//  Attribute to query    
querybyexpression.Attributes.AddRange("address1_city");

//  Value of queried attribute to return    
querybyexpression.Values.AddRange("Detroit");    

//  Query passed to the service proxy    
EntityCollection retrieved = _serviceProxy.RetrieveMultiple(querybyexpression);   

//  Iterate through returned collection    
foreach (var c in retrieved.Entities)    
{
      System.Console.WriteLine("Name: " + c.Attributes["name"]);
      System.Console.WriteLine("Address: " + c.Attributes["address1_city"]);      
      System.Console.WriteLine("E-mail: " + c.Attributes["emailaddress1"]);    
}

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Use the QueryByAttribute class

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