ResourceMap Class


A collection of related resources, typically either for a particular app package, or a resource file for a particular package.

public ref class ResourceMap sealed : IIterable<IKeyValuePair<Platform::String ^, NamedResource ^> ^>, IMapView<Platform::String ^, NamedResource ^>
class ResourceMap sealed : IIterable<IKeyValuePair<winrt::hstring, NamedResource const &>>, IMapView<winrt::hstring, NamedResource const &>
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
public sealed class ResourceMap : IEnumerable<KeyValuePair<string,NamedResource>>, IReadOnlyDictionary<string,NamedResource>
Public NotInheritable Class ResourceMap
Implements IEnumerable(Of KeyValuePair(Of String, NamedResource)), IReadOnlyDictionary(Of String, NamedResource)

Windows 10 requirements

Device family
Windows 10 (introduced in 10.0.10240.0)
API contract
Windows.Foundation.UniversalApiContract (introduced in v1.0)


This example is based on scenario 13 of the Application resources and localization sample. See the sample for the more complete solution.

// Create a ResourceContext.
var resourceContext = new Windows.ApplicationModel.Resources.Core.ResourceContext();

// Set the specific context for lookup of resources.
var qualifierValues = resourceContext.qualifierValues;
qualifierValues["language"] = "en-US";
qualifierValues["contrast"] = "standard";
qualifierValues["scale"] = "140";
qualifierValues["homeregion"] = "021"; // Northern America

// Resources actually reside within Scenario13 Resource Map.
var resourceIds = [

var output = { str: "" };
resourceIds.forEach(function (resourceId) {
    renderNamedResource(resourceId, resourceContext, output);

function renderNamedResource(resourceId, resourceContext, output) {
    output.str += "Resource ID " + resourceId + ":\n";
    // Lookup the resource in the mainResourceMap (the one for this package).
    var namedResource = Windows.ApplicationModel.Resources.Core.ResourceManager.current.mainResourceMap.lookup(resourceId);

    // Return a ResourceCandidateVectorView of all possible resources candidates
    // resolved against the context in order of appropriateness.
    var resourceCandidates = namedResource.resolveAll(resourceContext);

    resourceCandidates.forEach(function (candidate, index) {
        renderCandidate(candidate, index, output);
    output.str += "\n";

function renderCandidate(candidate, index, output) {
    // Get all the various qualifiers for the candidate (such as language, scale, contrast).
    candidate.qualifiers.forEach(function (qualifier) {
        output.str += "qualifierName: " + qualifier.qualifierName + "\n";
        output.str += "qualifierValue: " + qualifier.qualifierValue + "\n";
        output.str += "isDefault: ";
        output.str += (qualifier.isDefault) ? "true\n" : "false\n";
        output.str += "isMatch: ";
        output.str += (qualifier.isMatch) ? "true\n" : "false\n";
        output.str += "score: " + qualifier.score + "\n";
        output.str += "\n";


Resource identifier syntax

Many methods of this class use resource identifiers as parameters. The resource identifier is treated as a Uniform Resource Identifier (URI) fragment, subject to Uniform Resource Identifier (URI) semantics. For example, GetValue("Caption%20") is treated as GetValue("Caption ").

Do not use "?" or "#" in resource identifiers, because they terminate the resource path evaluation. For example, "MyResource?3" is treated as "MyResource".

Collection member lists

For JavaScript, ResourceMap supports using an index to access items.



Gets the number of resources in the map.


Gets a URI that can be used to refer to this ResourceMap.



Returns an iterator to enumerate the items in the map.


Returns a ResourceMap that represents a part of another ResourceMap, typically used to access a particular resource file within an app package.

This method finds subtree, ancestor, sibling and cousin maps to this resource map, as well as top-level maps. It returns the resource map represented by a given resource map identifier, relative to this resource map. This method is typically used to make simpler references to a particular subset of resources, such as a single resource file, or a directory of files.



GetValue(String) may be altered or unavailable for releases after Windows 8.1. Instead, use GetValue(String, ResourceContext).

Returns the most appropriate candidate for a resource that is specified by a resource identifier within the default context.

GetValue(String, ResourceContext)

Returns the most appropriate candidate for a resource that is specified by a resource identifier for the supplied context.


Determines whether the map can retrieve a resource with the specified resource identifier.


Returns the NamedResource at the specified resource identifier in the map.

Split(IReadOnlyDictionary<String,NamedResource>, IReadOnlyDictionary<String,NamedResource>)

Splits the map view into two views.

Applies to

See also