Gets a value that uniquely identifies a particular invocation of a callback.

Gets or sets a value that receives the enumerated items from the provider. If SearchExpression is not null, the provider must return only those directory entries whose names match the search expression. If SearchExpression is null, the provider must return all directory entries.

Gets the path to the target file. This path is always specified relative to the virtualization root.

Gets a value that identifies the virtualization instance.

Gets the search expression. The search expression may include wildcard characters. The provider should use the ProjectedFileSystem's DoesNameContainWildCards function to determine whether wildcards are present in searchExpression, and it should use the DoesFileNameMatch function to determine whether an entry in its backing store matches a search expression containing wildcards.

Gets the process that triggered this callback. If this information is not available, this will be null.

Gets the process identifier for the process that triggered this callback. If this information is not available, this will be 0.

Gets the version information if the target of the callback is a placeholder or partial file.