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XmlResolver.GetEntity Method

When overridden in a derived class, maps a URI to an object containing the actual resource.

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

public abstract Object GetEntity(
	Uri absoluteUri,
	string role,
	Type ofObjectToReturn
)

Parameters

absoluteUri
Type: System.Uri
The URI returned from ResolveUri.
role
Type: System.String
The current version does not use this parameter when resolving URIs. This is provided for future extensibility purposes. For example, this can be mapped to the xlink:role and used as an implementation specific argument in other scenarios.
ofObjectToReturn
Type: System.Type
The type of object to return. The current version only returns System.IO.Stream objects.

Return Value

Type: System.Object
A System.IO.Stream object or null if a type other than stream is specified.

ExceptionCondition
XmlException

ofObjectToReturn is not a Stream type.

UriFormatException

The specified URI is not an absolute URI.

ArgumentNullException

absoluteUri is null.

Exception

There is a runtime error (for example, an interrupted server connection).

This method is used when the caller wants to map a given URI into the object containing the actual resource that the URI represents. The type of object returned is negotiable; however, the implementation must always support System.IO.Stream.

Security noteSecurity Note

Your application can mitigate memory Denial of Service threats to the GetEntity method by implementing a wrapping implemented IStream that limits the number of bytes read. This helps to guard against situations where malicious code attempts to pass an infinite stream of bytes to the GetEntity method.

See XmlUrlResolver.GetEntity for an example using this method.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, 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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