XmlBinaryWriterSession.TryAdd Method

Tries to add an XmlDictionaryString to the internal collection.

Namespace:  System.Xml
Assembly:  System.Runtime.Serialization (in System.Runtime.Serialization.dll)

public virtual bool TryAdd(
	XmlDictionaryString value,
	out int key


Type: System.Xml.XmlDictionaryString

The XmlDictionaryString to add.

Type: System.Int32

The key of the XmlDictionaryString that was successfully added.

Return Value

Type: System.Boolean
true if the string could be added; otherwise, false.


value is null.


An entry with key = key already exists.

When you use this class you must override this method to send the collection of keys along with the message. Without overriding, a new key is added to the collection, which is saved, but not sent with the message.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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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