added similar helpers for assistants

README.md

@@ -484,13 +484,7 @@ Next, create a new thread. For illustrative purposes, you could include an initi
 ```csharp
 ThreadCreationOptions threadOptions = new()
 {
- InitialMessages =
- {
- new ThreadInitializationMessage(new List<MessageContent>()
- {
- MessageContent.FromText("How well did product 113045 sell in February? Graph its trend over time."),
- }),
- }, 
+ InitialMessages = { "How well did product 113045 sell in February? Graph its trend over time." }
 };
 
 ThreadRun threadRun = assistantClient.CreateThreadAndRun(assistant.Id, threadOptions);

examples/Assistants/Example01_RetrievalAugmentedGeneration.cs

@@ -85,13 +85,7 @@ public void Example01_RetrievalAugmentedGeneration()
  // Now we'll create a thread with a user query about the data already associated with the assistant, then run it
  ThreadCreationOptions threadOptions = new()
  {
- InitialMessages =
- {
- new ThreadInitializationMessage(new List<MessageContent>()
- {
- MessageContent.FromText("How well did product 113045 sell in February? Graph its trend over time."),
- }),
- },
+ InitialMessages = { "How well did product 113045 sell in February? Graph its trend over time." }
  };
 
  ThreadRun threadRun = assistantClient.CreateThreadAndRun(assistant.Id, threadOptions);

examples/Assistants/Example02_FunctionCalling.cs

@@ -82,7 +82,7 @@ string GetCurrentWeather(string location, string unit = "celsius")
  // Create a thread with an initial user message and run it.
  ThreadCreationOptions threadOptions = new()
  {
- InitialMessages = { new ThreadInitializationMessage(["What's the weather like today?"]), },
+ InitialMessages = { "What's the weather like today?" }
  };
 
  ThreadRun run = client.CreateThreadAndRun(assistant.Id, threadOptions);

examples/Assistants/Example02_FunctionCallingAsync.cs

@@ -82,7 +82,7 @@ string GetCurrentWeather(string location, string unit = "celsius")
  // Create a thread with an initial user message and run it.
  ThreadCreationOptions threadOptions = new()
  {
- InitialMessages = { new ThreadInitializationMessage(["What's the weather like today?"]), },
+ InitialMessages = { "What's the weather like today?" }
  };
 
  ThreadRun run = await client.CreateThreadAndRunAsync(assistant.Id, threadOptions);

examples/Assistants/Example04_AllTheTools.cs

@@ -83,13 +83,10 @@ static string GetNameOfFamilyMember(string relation)
  {
  InitialMessages =
  {
- new ThreadInitializationMessage(
- [
- "Create a graph of a line with a slope that's my father's favorite number "
- + "and an offset that's my mother's favorite number.",
- "Include people's names in your response and cite where you found them."
- ]),
- },
+ "Create a graph of a line with a slope that's my father's favorite number "
+ + "and an offset that's my mother's favorite number.",
+ "Include people's names in your response and cite where you found them."
+ }
  });
 
  ThreadRun run = client.CreateRun(thread, assistant);

src/Custom/Assistants/ThreadInitializationMessage.cs

@@ -16,4 +16,15 @@ public ThreadInitializationMessage(IEnumerable<MessageContent> content) : base(c
  internal ThreadInitializationMessage(MessageCreationOptions baseOptions)
  : base(baseOptions.Role, baseOptions.Content, baseOptions.Attachments, baseOptions.Metadata, null)
  { }
+
+ /// <summary>
+ /// Implicitly creates a new instance of <see cref="ThreadInitializationMessage"/> from a single item of plain text
+ /// content.
+ /// </summary>
+ /// <remarks>
+ /// Using a <see cref="string"/> in the position of a <see cref="ThreadInitializationMessage"/> is equivalent to
+ /// using the <see cref="ThreadInitializationMessage(IEnumerable{MessageContent})"/> constructor with a single
+ /// <see cref="MessageContent.FromText(string)"/> content instance.
+ /// </remarks>
+ public static implicit operator ThreadInitializationMessage(string initializationMessage) => new([initializationMessage]);
 }

src/Custom/Chat/ChatMessageContentPart.cs

@@ -130,4 +130,14 @@ public static ChatMessageContentPart CreateImageMessageContentPart(BinaryData im
  /// </summary>
  /// <returns></returns>
  public override string ToString() => Text;
+
+ /// <summary>
+ /// Implicitly creates a new <see cref="ChatMessageContentPart"/> instance from an item of plain text.
+ /// </summary>
+ /// <remarks>
+ /// Using a <see cref="string"/> in the position of a <see cref="ChatMessageContentPart"/> is equivalent to
+ /// calling the <see cref="CreateTextMessageContentPart(string)"/> method.
+ /// </remarks>
+ /// <param name="content"> The text content to use as this content part. </param>
+ public static implicit operator ChatMessageContentPart(string content) => new(content);
 }