Reuse Entity Search definition in your custom code

Artikel
02/21/2017

Applies To: Dynamics 365 (online), Dynamics 365 (on-premises), Dynamics CRM 2013, Dynamics CRM 2015, Dynamics CRM 2016

Entity search in Unified Service Desk is exposed as a service for developers so that they can programmatically use an existing entity search definition in their custom code to search Microsoft Dynamics 365 data. Entity searches in Unified Service Desk use FetchXML to query the Dynamics 365 web services to return data. For information about defining entity searches, see Search data using entity searches in Unified Service Desk.

When you set up an entity search, you can choose whether to return an entire search result set or page the FetchXML results for large datasets by using a paging cookie for faster performance. For more information about using paging cookie with FetchXML, see Page large result sets with FetchXML.

Since you use an entity search name in your code to return data and not its FetchXML definition, updating the underlying FetchXML query definition of the entity search in Unified Service Desk without changing the entity search name ensures that you won’t have to update your custom control code, recompile, and redistribute it on the client computers.

Use the new EntitySearchRequest message to construct a request, and then pass the request as parameter to the EntitySearchService.GetEntitySearchResults method to get the response (EntitySearchResponse).

In This Topic

Create an EntitySearchRequest object

Execute the request object

Create an EntitySearchRequest object

The EntitySearchRequest message is overloaded, and you must use any of the following three constructors to create a request object depending how you want the records to be returned. Creating a request object without using one of these three constructors is not supported. Before using an entity search name in the request object, ensure that the entity search is already defined in Unified Service Desk on your Dynamics 365 instance.

Create a request object using just the entity search name. Use this constructor to return all the records as a result of the entity search.
```
EntitySearchRequest mySearchRequest = new EntitySearchRequest(string entitySearchName);
```
Create a request object using the entity search name and the maximum count of the records to be returned. Use this constructor to limit the number of records returned as a result of the entity search.
```
EntitySearchRequest mySearchRequest = new EntitySearchRequest(string entitySearchName, int maxCount);
```
Tip

Specify 0 for the maxCount parameter to return all the records.
Create a request object using the entity search name, page count, page number, and paging cookie. Use this constructor to return large datasets in pages for faster performance.

The pageCount parameter defines the number of records to return per page. The pageNumber parameter defines the page number of the result set to return the data. For example, if your query returns 500 records, you can specify pageCount as 50 to return 50 records in a page, which implies that you’ll have 10 pages of data (50 records * 10 pages = 500). Now, if you want to return records 100-150, specify the pageNumber value as 3. You must specify pageCookie as empty to retrieve the first page of the result set.
```
EntitySearchRequest mySearchRequest = new EntitySearchRequest(string entitySearchName, int pageCount, int pageNumber, string pageCookie);
```
Note

When you execute the request object using this constructor to retrieve results in pages, the EntitySearchResponse.HasMoreRecords property of the response object indicates if there are more records (value=1). Also, the value of the EntitySearchResponse.PageCookie property is set to the paging cookie returned from current results.

Execute the request object

Use the EntitySearchService.GetEntitySearchResults method to execute the request object created as described in the previous section. This method executes the EntitySearchRequest object, and returns a EntitySearchResponse object with the entity search results.

The following code sample demonstrates how you can reuse an existing entity search to retrieve results in pages.

// Define parameters for the entity search request object.
string entitySearchName = "Sample Entity Search"; // Name of the entity search record defined in Unified Service Desk
int pageCount = 10; // Retrieve 10 records per page.
int pageNumber = 0;
string pageCookie = String.Empty; // Retrieve the first page of the result set.

var entityService = AifServiceContainer.Instance.GetService<IEntitySearchService>();

// Create a request object.
EntitySearchRequest entitySearchRequest = new EntitySearchRequest(searchName, pageCount, pageNumber, pageCookie);

bool hasMoreRecords = true;

while (hasMoreRecords)
{
   entityService.GetEntitySearchResults(entitySearchRequest, (entitySearchResponse) =>
   {
      foreach (Entity e in entitySearchResponse.Entities)
      {
         Console.WriteLine("Entity with id:\"{0}\" retrieved", e.Id);
      }
      if (entitySearchResponse.HasMoreRecords)
      {
         pageNumber++;
         pageCookie = entitySearchResponse.PageCookie;
         entitySearchRequest = new EntitySearchRequest(searchName, pageCount, pageNumber, pageCookie);
      }
      else
      {
         hasMoreRecords = false;
      }
   });
}

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Reuse Entity Search definition in your custom code

In This Topic

Create an EntitySearchRequest object

Execute the request object

See Also

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