--- title: OptimizelyUserContext for the C# SDK slug: feature-experimentation/docs/optimizelyusercontext-csharp docTags: createdAt: 2026-08-05T20:40:02.000Z --- The `OptimizelyUserContext` object lets you make flag decisions and track events for a user context that you have already created using the [Create User Context](docId\:NMLEiJmrOW1XL9kGEplxb) method. ## OptimizelyUserContext minimum SDK version SDK v3.7 and higher. ### Forced decision methods minimum SDK version `SetForcedDecision()`, `GetForcedDecision()`, `RemoveForcedDecision()` and `RemoveAllForcedDecisions()` methods are supported on v3.11.0 and higher. ### Real-Time Audiences for Feature Experimentation minimum SDK version `FetchQualifiedSegments()` and `IsQualifiedFor()` methods are supported on version 4.0.0 and higher. ## OptimizelyUserContext updates ```csharp public class OptimizelyUserContext { public OptimizelyUserContext(Optimizely optimizely, string userId, UserAttributes userAttributes, ForcedDecisionsStore forcedDecisionsStore, IErrorHandler errorHandler, ILogger logger); // Set an attribute for the user public void SetAttribute(string key, object value); // Get attributes for the user public UserAttributes GetAttributes(); // Make a decision about which flag variation the user buckets into for the flag key public OptimizelyDecision Decide(string key, OptimizelyDecideOption[] options); // Make decisions about which flag variations the user buckets into for flag keys public Dictionary DecideForKeys(string[] keys, OptimizelyDecideOption[] options); // Make decisions about which flag variations the user buckets into for all flags public Dictionary DecideAll(OptimizelyDecideOption[] options); // Track user event public void TrackEvent(string eventName, EventTags eventTags); // Sets a forced decision (variationKey) for a given decision context public bool SetForcedDecision(OptimizelyDecisionContext context, OptimizelyForcedDecision decision); // Returns the forced decision (variationKey) for a given decision context public OptimizelyForcedDecision GetForcedDecision(OptimizelyDecisionContext context); // Removes the forced decision (variationKey) for a given decision context public bool RemoveForcedDecision(OptimizelyDecisionContext context); // Removes all the forced decisions (variationKeys) for the user context public bool RemoveAllForcedDecisions(); /* * The following methods require Real-Time Audiences for Feature Experimentation. * See the note following the code sample. */ // An array of segment names that the user is qualified for. // The result of **fetchQualifiedSegments()** is saved here. // Can be null if not properly updated with fetchQualifiedSegments(). // // You can read and write directly to the qualified segments array. // This lets you bypass the remote fetching process from ODP // or for utilizing your own fetching service. public List GetQualifiedSegments(); // Set the qualified audiences that the user is qualified for. public void SetQualifiedSegments(List qualifiedSegments); // Fetch all qualified segments for the user context. // The audiences fetched are saved in the **QualifiedSegments** array // and can be accessed any time. public bool FetchQualifiedSegments(List segmentOptions = null); // Fetch all qualified audiences for the user context in a non-blocking manner. // This method fetches segments in a separate thread and invokes the provided // callback when results are available. public Task FetchQualifiedSegments(Action callback, List segmentOptions = null); // Check if the user is qualified for the given segment. public bool IsQualifiedFor(string segment); } ``` :::hint{type="info"} **Note** You must first enable and configure Real-Time Audiences for Feature Experimentation to use the `GetQualifiedSegments()`, `SetQualifiedSegments()`, `FetchQualifiedSegments()`, and `IsQualifiedFor()` methods. See [Real-Time Audiences for Feature Experimentation](docId:6UBBxxRv331nBIVZ2lun8). ::: ## Properties | Attribute | Type | Comment | | --------------------- | ---------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | userId | string | The ID of the user | | (optional) attributes | Dictionary | A dictionary of custom key-value pairs specifying attributes for the user used for \[audience targeting]\(https\://support.optimizely.com/hc/en-us/articles/38683417490957). You can pass the map with the user ID when you create the user. | ## Methods The following table shows methods for the `OptimizelyUserContext` object: | Method | Comment | | --------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | SetAttribute | Pass a custom user attribute as a key-value pair to the user context. | | GetAttributes | Get attributes for the user | | Decide | Returns a decision result for a flag key for a user in an OptimizelyDecision object containing all data required to deliver the flag rule. See \[Decide methods]\(https\://docs.developers.optimizely.com/feature-experimentation/docs/decide-methods-csharp) | | DecideForKeys | Returns a map of flag decisions for specified flag keys. See \[Decide methods]\(https\://docs.developers.optimizely.com/feature-experimentation/docs/decide-methods-csharp) | | DecideAll | Returns decisions for all active (unarchived) flags for a user. See \[Decide methods]\(https\://docs.developers.optimizely.com/feature-experimentation/docs/decide-methods-csharp) | | TrackEvent | Tracks a conversion event for a user (an action a user takes) and logs an error message if the specified event key does not match any existing events. See \[Track Event]\(https\://docs.developers.optimizely.com/feature-experimentation/docs/track-event-csharp) | | SetForcedDecision | Forces a user into a specific variation. See \[Set Forced Decision]\(https\://docs.developers.optimizely.com/feature-experimentation/docs/forced-decision-methods-csharp#set-forced-decision-method---setforceddecision) | | GetForcedDecision | Returns what variation the user was forced into. See \[Get Forced Decision]\(https\://docs.developers.optimizely.com/feature-experimentation/docs/forced-decision-methods-csharp#get-forced-decision-method---getforceddecision) | | RemoveForcedDecision | Removes a user from a specific forced variation. See \[Remove Forced Decision]\(https\://docs.developers.optimizely.com/feature-experimentation/docs/forced-decision-methods-csharp#remove-forced-decision-method---removeforceddecision) | | RemoveAllForcedDecisions | Removes a user from all forced variations. See \[Remove All Forced Decisions]\(https\://docs.developers.optimizely.com/feature-experimentation/docs/forced-decision-methods-csharp#remove-all-forced-decisions-method---removeallforceddecisions) | | FetchQualifiedSegments \*\* | Fetch all Optimizely Data Platform (ODP) real-time audiences for which the user context qualified. See \[Real-Time Audiences for Feature Experimentation segment qualification methods for the C# SDK]\(https\://docs.developers.optimizely.com/feature-experimentation/docs/real-time-audiences-for-feature-experimentation-segment-qualification-methods-csharp#fetchqualifiedsegments). | | IsQualifiedFor \*\* | Check if the user context qualifies for a given ODP real-time segment. See \[Real-Time Audiences for Feature Experimentation segment qualification methods for the C# SDK]\(https\://docs.developers.optimizely.com/feature-experimentation/docs/real-time-audiences-for-feature-experimentation-segment-qualification-methods-csharp#fetchqualifiedsegments). | \*\* Requires [Real-Time Audiences for Feature Experimentation](docId:6UBBxxRv331nBIVZ2lun8). ## See also [Create User Context](docId\:NMLEiJmrOW1XL9kGEplxb) [Forced Decision methods](docId\:Hvqig-mRzzH9WkU54enfY) ## Source files The language and platform source files containing the implementation for C# are available on [GitHub](https://github.com/optimizely/csharp-sdk/blob/master/OptimizelySDK/Optimizely.cs).