implement `ThreadChannelProperties`

src/Discord.Net.Core/Entities/Channels/IThreadChannel.cs

@@ -111,5 +111,16 @@ namespace Discord
         ///     A task that represents the asynchronous operation of removing a user from this thread.
         /// </returns>
         Task RemoveUserAsync(IGuildUser user, RequestOptions options = null);
+
+        /// <summary>
+        ///     Modifies this thread channel.
+        /// </summary>
+        /// <param name="func">The delegate containing the properties to modify the channel with.</param>
+        /// <param name="options">The options to be used when sending the request.</param>
+        /// <returns>
+        ///     A task that represents the asynchronous modification operation.
+        /// </returns>
+        /// <seealso cref="ThreadChannelProperties"/>
+        Task ModifyAsync(Action<ThreadChannelProperties> func, RequestOptions options = null);
     }
 }

src/Discord.Net.Core/Entities/Channels/TextChannelProperties.cs

@@ -40,25 +40,10 @@ namespace Discord
         /// <exception cref="ArgumentOutOfRangeException">Thrown if the value does not fall within [0, 21600].</exception>
         public Optional<int> SlowModeInterval { get; set; }
 
-        /// <summary>
-        ///     Gets or sets whether or not the thread is archived.
-        /// </summary>
-        public Optional<bool> Archived { get; set; }
-
-        /// <summary>
-        ///     Gets or sets whether or not the thread is locked.
-        /// </summary>
-        public Optional<bool> Locked { get; set; }
-
         /// <summary>
         ///     Gets or sets the auto archive duration.
         /// </summary>
         public Optional<ThreadArchiveDuration> AutoArchiveDuration { get; set; }
 
-        /// <summary>
-        /// Gets or sets the tags applied to a forum thread
-        /// </summary>
-        public Optional<IEnumerable<ulong>> AppliedTags { get; set; }
-
     }
 }

src/Discord.Net.Core/Entities/Channels/ThreadChannelProperties.cs

@@ -0,0 +1,26 @@
+using System.Collections.Generic;
+
+namespace Discord;
+
+
+/// <summary>
+///     Provides properties that are used to modify an <see cref="IThreadChannel"/> with the specified changes.
+/// </summary>
+/// <seealso cref="IThreadChannel.ModifyAsync(System.Action{ThreadChannelProperties}, RequestOptions)"/>
+public class ThreadChannelProperties : TextChannelProperties
+{
+    /// <summary>
+    /// Gets or sets the tags applied to a forum thread
+    /// </summary>
+    public Optional<IEnumerable<ulong>> AppliedTags { get; set; }
+
+    /// <summary>
+    ///     Gets or sets whether or not the thread is locked.
+    /// </summary>
+    public Optional<bool> Locked { get; set; }
+
+    /// <summary>
+    ///     Gets or sets whether or not the thread is archived.
+    /// </summary>
+    public Optional<bool> Archived { get; set; }
+}

src/Discord.Net.Rest/Entities/Channels/RestThreadChannel.cs

@@ -114,6 +114,13 @@ namespace Discord.Rest
             Update(model);
         }
 
+        /// <inheritdoc/>
+        public async Task ModifyAsync(Action<ThreadChannelProperties> func, RequestOptions options = null)
+        {
+            var model = await ThreadHelper.ModifyAsync(this, Discord, func, options);
+            Update(model);
+        }
+
         /// <inheritdoc/>
         /// <remarks>
         ///     <b>This method is not supported in threads.</b>

src/Discord.Net.Rest/Entities/Channels/ThreadHelper.cs

@@ -46,10 +46,10 @@ namespace Discord.Rest
         }
 
         public static async Task<Model> ModifyAsync(IThreadChannel channel, BaseDiscordClient client,
-            Action<TextChannelProperties> func,
+            Action<ThreadChannelProperties> func,
             RequestOptions options)
         {
-            var args = new TextChannelProperties();
+            var args = new ThreadChannelProperties();
             func(args);
             var apiArgs = new ModifyThreadParams
             {

src/Discord.Net.WebSocket/Entities/Channels/SocketThreadChannel.cs

@@ -342,6 +342,10 @@ namespace Discord.WebSocket
         public override Task ModifyAsync(Action<TextChannelProperties> func, RequestOptions options = null)
             => ThreadHelper.ModifyAsync(this, Discord, func, options);
 
+        /// <inheritdoc/>
+        public Task ModifyAsync(Action<ThreadChannelProperties> func, RequestOptions options = null)
+            => ThreadHelper.ModifyAsync(this, Discord, func, options);
+
         /// <inheritdoc/>
         /// <remarks>
         ///     <b>This method is not supported in threads.</b>