Adding Filter property to ConversationSelectMenu & ConversationMultiS…

…electMenu

SlackNet/Blocks/ConversationFilter.cs

@@ -0,0 +1,35 @@
+using System.Collections.Generic;
+
+namespace SlackNet.Blocks
+{
+    /// <summary>
+    /// Provides a way to filter the list of options in a <see cref="ConversationSelectMenu"/> or <see cref="ConversationMultiSelectMenu"/>.
+    /// </summary>
+    public class ConversationFilter
+    {
+        /// <summary>
+        /// Indicates which type of conversations should be included in the list.
+        /// When this field is provided, any conversations that do not match will be excluded.
+        /// </summary>
+        [IgnoreIfEmpty]
+        public IList<ConversationTypeFilter> Include { get; set; } = new List<ConversationTypeFilter>();
+
+        /// <summary>
+        /// Indicates whether to exclude external shared channels from conversation lists. 
+        /// </summary>
+        public bool ExcludeExternalSharedChannels { get; set; }
+
+        /// <summary>
+        /// Indicates whether to exclude bot users from conversation lists.
+        /// </summary>
+        public bool ExcludeBotUsers { get; set; }
+    }
+
+    public enum ConversationTypeFilter
+    {
+        Public,
+        Private,
+        Mpim,
+        Im
+    }
+}

SlackNet/Blocks/ConversationMultiSelectMenu.cs

@@ -19,6 +19,11 @@ public ConversationMultiSelectMenu() : base("multi_conversations_select") { }
         /// Specifies the maximum number of items that can be selected in the menu. Minimum number is 1.
         /// </summary>
         public int? MaxSelectedItems { get; set; }
+
+        /// <summary>
+        /// A <see cref="ConversationFilter"/> object that reduces the list of available conversations using the specified criteria.
+        /// </summary>
+        public ConversationFilter Filter { get; set; }
     }
 
     [SlackType("multi_conversations_select")]

SlackNet/Blocks/ConversationSelectMenu.cs

@@ -12,6 +12,11 @@ public ConversationSelectMenu() : base("conversations_select") { }
         /// The ID of any valid conversation to be pre-selected when the menu loads.
         /// </summary>
         public string InitialConversation { get; set; }
+
+        /// <summary>
+        /// A <see cref="ConversationFilter"/> object that reduces the list of available conversations using the specified criteria.
+        /// </summary>
+        public ConversationFilter Filter { get; set; }
     }
 
     [SlackType("conversations_select")]