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SqlFunctionAttribute Class

Used to mark a method definition of a user-defined aggregate as a function in SQL Server. The properties on the attribute reflect the physical characteristics used when the type is registered with SQL Server.

Namespace:  Microsoft.SqlServer.Server
Assembly:  System.Data (in System.Data.dll)

[AttributeUsageAttribute(AttributeTargets.Method, AllowMultiple = false, Inherited = false)]
public class SqlFunctionAttribute : Attribute

The following example shows an aggregate function that returns a list of files in the specified directory path.

[SqlFunctionAttribute(FillRowMethodName = "FillFileRow")]
public static IEnumerable GetFileDetails(string directoryPath)
      DirectoryInfo di = new DirectoryInfo(directoryPath);
      return di.GetFiles();
   catch (DirectoryNotFoundException dnf)
      return new string[1] { dnf.ToString() };


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0