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creating-a-data-processing-extension-library.md

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title description author ms.author ms.date ms.service ms.subservice ms.topic ms.custom helpviewer_keywords
Create a data processing extension library
Learn how to create a Reporting Services data processing extension. View sample code, and see which namespace and library file requirements you need to meet.
maggiesMSFT
maggies
03/14/2017
reporting-services
extensions
reference
updatefrequency5
data processing extensions [Reporting Services], namespace assignments
library [Reporting Services]
assigning namespaces to extensions

Create a data processing extension library

Each [!INCLUDEssRSnoversion] data processing extension you create should be assigned to a unique namespace and built into a library or assembly file. The exact name of the namespace isn't important, but it must be unique and not shared with any other extension. [!INCLUDEmsCoName] uses the namespace xref:Microsoft.ReportingServices.DataProcessing for the data processing extensions that ship with [!INCLUDEssRSnoversion]. You should create your own unique namespaces for your company's data processing extensions.

The following example shows the code to begin a [!INCLUDEssRSnoversion] data processing extension, which uses the namespaces that contain the data processing interfaces and any utility classes.

Imports System  
Imports Microsoft.ReportingServices.DataProcessing  
Imports Microsoft.ReportingServices.Interfaces  
  
Namespace CompanyName.ExtensionName  
   ...  
using System;  
using Microsoft.ReportingServices.DataProcessing;  
using Microsoft.ReportingServices.Interfaces;  
  
namespace CompanyName.ExtensionName  
{  
   ...

When compiling a [!INCLUDEssRSnoversion] data processing extension, you must supply to the compiler a reference to Microsoft.ReportingServices.Interfaces.dll, because the data processing extension interfaces are contained there. The xref:Microsoft.ReportingServices.DataProcessing namespace is needed to implement the data processing extension interfaces, and the xref:Microsoft.ReportingServices.Interfaces namespace is needed to implement the xref:Microsoft.ReportingServices.Interfaces.IExtension interface. For example, if all the files containing the code to implement a [!INCLUDEssRSnoversion] data processing extension written in C# were in a single directory with the extension .cs, the following command would be issued from that directory to compile the files stored in CompanyName.ExtensionName.dll.

csc /t:library /out:CompanyName.ExtensionName.dll *.cs /r:System.dll /r:Microsoft.ReportingServices.Interfaces.dll

The following code example shows the command that would be used for [!INCLUDEmsCoName] [!INCLUDEvisual-basic] files with the extension .vb.

vbc /t:library /out:CompanyName.ExtensionName.dll *.vb /r:System.dll /r:Microsoft.ReportingServices.Interfaces.dll

Note

You can also design, develop, and build your data processing extension using [!INCLUDEvsprvs]. For more information about developing assemblies in [!INCLUDEvsprvs], see your [!INCLUDEvsprvs] documentation.

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