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SatelliteContractVersionAttribute Class


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Instructs a ResourceManager object to ask for a particular version of a satellite assembly.

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


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


Initializes a new instance of the SatelliteContractVersionAttribute class.


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)


Gets the version of the satellite assemblies with the required resources.


This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)


Returns the hash code for this instance.(Inherited from Attribute.)


Gets the Type of the current instance.(Inherited from Object.)


When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)


When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)


Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

In desktop apps, the SatelliteContractVersionAttribute attribute establishes a contract between a main assembly and all its satellites. You apply this attribute to your main assembly, and pass it the version number of the satellite assemblies that will work with this version of the main assembly. When the resource manager (ResourceManager object) looks up resources, it explicitly loads the satellite version specified by this attribute on the main assembly.

When you update the main assembly, you increment its assembly version number. However, you might not want to ship new copies of your satellite assemblies if the existing ones are compatible with your app. In this case, increment the main assembly's version number but leave the satellite contract version number the same. The resource manager will use your existing satellite assemblies.

If you want to revise a satellite assembly but not the main assembly, increment the version number on your satellite. In this case, ship a publisher policy assembly along with your satellite assembly stating that your new satellite assembly has backward compatibility with your old satellite assembly. The resource manager will still use the old contract number written into your main assembly based on the SatelliteContractVersionAttribute attribute; however, the loader will bind to the satellite assembly version that is specified by the policy assembly.

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

This attribute is ignored in Windows 8.x Store apps, because package resource index (PRI) files do not have versioning semantics. In addition, the Windows 8.x Store packaging model requires all resources to ship in the same package, with no possibility of redeploying satellite assemblies or PRI files.

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1

Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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