Add setCachePolicy card action type

src/Microsoft.Teams.Apps/Schema/SuggestedAction.cs

@@ -113,6 +113,11 @@ public class ActionType(string value) : StringEnum(value)
     public static readonly ActionType SignIn = new("signin");
     /// <summary>Gets the <c>call</c> action type.</summary>
     public static readonly ActionType Call = new("call");
+    /// <summary>
+    /// Gets the <c>setCachePolicy</c> action type used to control caching for a link-unfurling response.
+    /// Set the action value to <c>{"type":"no-cache"}</c> to prevent Teams from caching the response.
+    /// </summary>
+    public static readonly ActionType SetCachePolicy = new("setCachePolicy");
     /// <summary>Gets the experimental <c>Action.Submit</c> action type.</summary>
     public static readonly ActionType Submit = new("Action.Submit");
 
@@ -150,6 +155,12 @@ public static class ActionTypes
     /// <summary>Gets the <c>call</c> action type.</summary>
     public static ActionType Call => ActionType.Call;
 
+    /// <summary>
+    /// Gets the <c>setCachePolicy</c> action type used to control caching for a link-unfurling response.
+    /// Set the action value to <c>{"type":"no-cache"}</c> to prevent Teams from caching the response.
+    /// </summary>
+    public static ActionType SetCachePolicy => ActionType.SetCachePolicy;
+
     /// <summary>Gets the experimental <c>Action.Submit</c> action type.</summary>
     [System.Diagnostics.CodeAnalysis.Experimental("ExperimentalTeamsSuggestedAction")]
     public static ActionType Submit => ActionType.Submit;

test/Microsoft.Teams.Apps.UnitTests/SuggestedActionsTests.cs

@@ -22,6 +22,7 @@ public void ActionTypes_Constants_HaveExpectedValues()
         Assert.Equal("downloadFile", ActionTypes.DownloadFile);
         Assert.Equal("signin", ActionTypes.SignIn);
         Assert.Equal("call", ActionTypes.Call);
+        Assert.Equal("setCachePolicy", ActionTypes.SetCachePolicy);
         Assert.Equal("Action.Submit", ActionTypes.Submit);
     }
 
@@ -250,4 +251,25 @@ public void MessageActivity_SuggestedActions_RoundTrip()
         Assert.Equal("imBack", roundTripped.SuggestedActions.Actions[1].Type!.ToString());
         Assert.Equal("Say Hi", roundTripped.SuggestedActions.Actions[1].Title);
     }
+
+    [Fact]
+    public void MessageActivity_SetCachePolicySuggestedAction_RoundTripsNoCacheValue()
+    {
+        MessageActivity activity = new("Link unfurl")
+        {
+            SuggestedActions = new SuggestedActions()
+                .AddAction(new SuggestedAction(
+                    ActionTypes.SetCachePolicy,
+                    "Disable caching",
+                    new { type = "no-cache" }))
+        };
+
+        string json = activity.ToJson();
+        CoreActivity coreActivity = CoreActivity.FromJsonString(json);
+        MessageActivity roundTripped = MessageActivity.FromActivity(coreActivity);
+
+        SuggestedAction action = Assert.Single(roundTripped.SuggestedActions!.Actions);
+        Assert.Equal("setCachePolicy", action.Type!.ToString());
+        Assert.Equal("no-cache", action.Value!["type"]!.GetValue<string>());
+    }
 }