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SatelliteContractVersionAttribute Class

Instructs the ResourceManager to ask for a particular version of a satellite assembly to simplify updates of the main assembly of an application.

Namespace:  System.Resources
Assembly:  mscorlib (in mscorlib.dll)

[AttributeUsageAttribute(AttributeTargets.Assembly, AllowMultiple = false)]
public sealed class SatelliteContractVersionAttribute : Attribute

The SatelliteContractVersionAttribute establishes a contract between a main assembly and all its satellites. When the ResourceManager looks up resources, it explicitly loads the satellite version specified by this attribute on the main assembly, allowing a layer of indirection to facilitate versioning scenarios.

When the main assembly is updated, its assembly version number is incremented. However, you might not want to ship new copies of your satellite assemblies if the existing ones are sufficient and compatible with the newer version of your product. In this case, increment the main assembly's version number but leave the satellite contract version number the same. The ResourceManager will use your existing satellite assemblies.

If you need to revise a satellite assembly but not the main assembly, you must increment the version number on your satellite. In this case, ship a policy assembly along with your satellite assembly stating that your new satellite assembly has backward compatibility with your old satellite assembly. The ResourceManager will still use the old contract number written into your main assembly; however, the loader will bind to the satellite assembly version as specified by the policy assembly.

A publisher policy assembly is the way in which a vendor of a shared component makes a compatibility statement about a particular version of a released assembly. A publisher policy assembly is a strongly named assembly with a name in the format policy.<major>.<minor>.<ComponentAssemblyName>, and is registered in the Global Assembly Cache (GAC). The publisher policy is generated from an XML configuration file (see <bindingRedirect> Element) by using the Assembly Linker (Al.exe) tool. The assembly linker is used with the /link option to link the XML configuration file to a manifest assembly, that is then stored in the GAC. The publisher policy assemblies can be used when a vendor ships a maintenance release (Service Pack) that contains bug fixes.


Apply this attribute to your main assembly, passing it the version number of the satellite assembly that will work with this version of the main assembly.

Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows CE Platform Note: Although the .NET Compact Framework supports SatelliteContractVersionAttribute, its implementation is reserved for a future version.


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, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0