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You can use the QueryByAttribute class to build queries that test a set of columns (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 table is retrieved. A query expression can only retrieve a collection of one table type. You can also pass this value by using the QueryExpression constructor. |
| ColumnSet | Specifies the set of columns (attributes) to retrieve. |
| Attributes | Specifies the set of attributes selected in the query. |
| Values | Specifies the column values to look for when the query is executed. |
| Orders | Specifies the order in which the rows are returned from the query. |
| PageInfo | Specifies the number of pages and the number of rows 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"]);
}