Entities and activity types

Artikkel
10/13/2022

APPLIES TO: SDK v4

Entities are a part of an activity, and provide additional information about the activity or conversation.

Note

Different parts of the SDK define separate entity classes or elements.

Entities

The entities property of a message is an array of open-ended schema.org objects, which allows the exchange of common contextual metadata between the channel and bot.

Mention entities

Many channels support the ability for a bot or user to "mention" someone within the context of a conversation. To mention a user in a message, populate the message's entities property with a mention object. The mention object contains these properties:

Property	Description
Type	Type of the entity ("mention")
Mentioned	Channel account object that indicates which user was mentioned
Text	Text within the activity.text property that represents the mention itself (may be empty or null)

This code example shows how to add a mention entity to the entities collection.

C#
JavaScript

var entity = new Entity();
entity.SetAs(new Mention()
{
    Text = "@johndoe",
    Mentioned = new ChannelAccount()
    {
        Name = "John Doe",
        Id = "UV341235"
    }
});
entities.Add(entity);

Tip

When attempting to determine user intent, the bot may want to ignore that portion of the message where it's mentioned. Call the GetMentions method and evaluate the Mention objects returned in the response.

var entity = context.activity.entities;

const mention = {
    type: "Mention",
    text: "@johndoe",
    mentioned: {
        name: "John Doe",
        id: "UV341235"
    }
}

entity = [mention];

Place objects

Location-related information can be conveyed within a message by populating the message's entities property with either a Place object or a GeoCoordinates object.

The place object contains these properties:

Property	Description
Type	Type of the entity ("Place")
Address	Description or postal address object (future)
Geo	GeoCoordinates
HasMap	URL to a map or map object (future)
Name	Name of the place

The geoCoordinates object contains these properties:

Property	Description
Type	Type of the entity ("GeoCoordinates")
Name	Name of the place
Longitude	Longitude of the location (WGS 84)
Latitude	Latitude of the location (WGS 84)
Elevation	Elevation of the location (WGS 84)

This code example shows how to add a place entity to the entities collection:

C#
JavaScript

var entity = new Entity();
entity.SetAs(new Place()
{
    Geo = new GeoCoordinates()
    {
        Latitude = 32.4141,
        Longitude = 43.1123123,
    }
});
entities.Add(entity);

var entity = context.activity.entities;

const place = {
    elavation: 100,
    type: "GeoCoordinates",
    name : "myPlace",
    latitude: 123,
    longitude: 234
};

entity = [place];

To consume entities, use either the dynamic keyword or strongly typed classes.

This code example shows how to use the dynamic keyword to process an entity within the Entities property of a message:

if (entity.Type == "Place")
{
    dynamic place = entity.Properties;
    if (place.geo.latitude > 34)
        // do something
}

This code example shows how to use a strongly typed class to process an entity within the Entities property of a message:

if (entity.Type == "Place")
{
    Place place = entity.GetAs<Place>();
    GeoCoordinates geo = place.Geo.ToObject<GeoCoordinates>();
    if (geo.Latitude > 34)
        // do something
}

This code example shows how to process an entity within the entity property of a message:

if (entity[0].type === "GeoCoordinates" && entity[0].latitude > 34) {
    // do something
}

Activity types

Activities can be of several different types past the most common message. Explanations and further details on different activity types can be found in the Bot Framework Activity schema.

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