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DataContractAttribute.IsReference Property

.NET Framework 4

Gets or sets a value that indicates whether to preserve object reference data.

Namespace:  System.Runtime.Serialization
Assembly:  System.Runtime.Serialization (in System.Runtime.Serialization.dll)
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public bool IsReference { get; set; }

Property Value

Type: System.Boolean
true to keep object reference data using standard XML; otherwise, false. The default is false.

Use the IsReference property to instruct the DataContractSerializer to insert XML constructs that preserve object reference information.

.NET Framework

Supported in: 4, 3.5 SP1, 3.0 SP2

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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Annotations FAQ
Using [DataMember IsRequired=true] with [DataContract IsReference=true] is not allowed
If you make your datacontract referable using [DataContract IsReference=true] then you can't use [DataMember IsRequired=true] on members of this datacontract.

See details at http://social.msdn.microsoft.com/Forums/en-US/wcf/thread/e5d38e14-31b0-4991-a988-d578c564e92d
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