# IUnionQueryDataPersistenceService{TEntity}

`IUnionQueryDataPersistenceService<TEntity>` in assembly SanteDB.Core.Api version 3.0.1980.0

## Summary

Represents a data persistence provider that can store and continue queries

## Operations

| Operation | Response/Return       | Input/Parameter                                                                                                                                                                                                     | Description                  |
| --------- | --------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------- |
| Union     | IEnumerable\<TEntity> | *Expression`1[]* **queries**<br/>*Guid* **queryId**<br/>*Int32* **offset**<br/>*Nullable&lt;Int32>* **count**<br/>*Int32&* **totalCount**<br/>*IPrincipal* **overrideAuthContext**<br/>*ModelSort`1\[]* **orderBy** | Queries or continues a query |

## Implementations

None

## Example Implementation

```csharp
/// Example Implementation
using SanteDB.Core.Services;
/// Other usings here
public class MyUnionQueryDataPersistenceService<TEntity> : SanteDB.Core.Services.IUnionQueryDataPersistenceService<TEntity> { 
	public String ServiceName => "My own IUnionQueryDataPersistenceService`1 service";
	/// <summary>
	/// Queries or continues a query
	/// </summary>
	public IEnumerable<TEntity> Union(Expression`1[] queries,Guid queryId,Int32 offset,Nullable<Int32> count,Int32& totalCount,IPrincipal overrideAuthContext,ModelSort`1[] orderBy){
		throw new System.NotImplementedException();
	}
}
```

## References

* [IUnionQueryDataPersistenceService\<TEntity> C# Documentation](http://santesuite.org/assets/doc/net/html/T_SanteDB_Core_Services_IUnionQueryDataPersistenceService_1.htm)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://help.santesuite.org/developers/server-plugins/implementing-.net-features/service-definitions/iunionquerydatapersistenceservice-tentity.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.