SqlUserDefinedAggregateAttribute Class

Indicates that the type should be registered as a user-defined aggregate. The properties on the attribute reflect the physical attributes used when the type is registered with SQL Server. This class cannot be inherited.

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

[AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Struct, AllowMultiple = false, 
	Inherited = false)]
public sealed class SqlUserDefinedAggregateAttribute : Attribute

SQL Server creates a user-defined aggregate that is bound to the class definition that has the SqlUserDefinedAggregateAttribute custom attribute. Every user-defined aggregate must be annotated with this attribute.

See "CLR User-Defined Aggregates" in SQL Server 2005 Books Online for more information on user-defined aggregates and examples.

The following example shows the SqlUserDefinedAggregateAttribute attribute for a user-defined aggregate. The aggregate uses custom serialization, has a maximum size of 8000 bytes when serialized, and is invariant to nulls, duplicates, and order.

using System;
using System.IO;
using System.Data.Sql;
using System.Data.SqlTypes;
using System.Text;
using Microsoft.SqlServer.Server;


[Serializable]
[Microsoft.SqlServer.Server.SqlUserDefinedAggregate(
   Microsoft.SqlServer.Server.Format.UserDefined, 
   IsInvariantToNulls = true,			
   IsInvariantToDuplicates = false,		
   IsInvariantToOrder = false,			
   MaxByteSize = 8000)				
        ]
public class Concatenate : Microsoft.SqlServer.Server.IBinarySerialize
{

System.Object
  System.Attribute
    Microsoft.SqlServer.Server.SqlUserDefinedAggregateAttribute

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
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