• 세종대왕

This C# Library is implemented of the LINE Developers APIs. and This is an unofficial LINE Developers library. There are so many features in LINE Developers APIs. However couldn't test such of features which are not offer in KOREA and some of pay features. but It'll works well. I hope it's helpful to develop message send and chatbot via LINE Messenger.

Since v1.1.20, It communicates based on HTTP/2.0 between LineDevelopers.NET and LINE APIs.
And it's not necessary to any migrate(such as code change) for the update.
so I strongly recommend to update v1.1.20

Install-Package LineDevelopers -Version 1.1.20 

• how to create / send a message
• webhook quick start

There are exists each class by unit of feature. for instance, it offer same features both a LineMessaingClient.Insight and a LineInsightClient class. but I recommend that you should use a LineMessagingClient class instead of each class.

• example)

  using Line.Message;
  
  using (var client = new LineMessagingClient("your access token"))
  {
      await client.Message.SendBroadcastMessageAsync(new TextMessage("hello world"));
      await client.Message.SendReplyMessageAsync("reply token", new TextMessage("hello world"));
      await client.Insight.GetNumberOfMessageDeliveriesAsync(new DateOnly(2022, 10, 31));
      await client.RichMenu.DownloadRichMenuImageAsync("test richmenu id", @"c:\temp\test.jpg");
  }

• Message

• Insight

• Rich menu

• GroupChat

• MultiPersonChat

• Users

• Account link

• Webhook settings

• Bot

• Channel access token

using Line;

using (var client = new LineChannelAccessTokenClient())
{
    try
    {
        var result = await client.IssueShortLivedChannelAccessTokenAsync("client id", "secret");

        await client.VerifyShortLonglivedChannelAccessTokenAsync(result.AccessToken);
    }
    catch (LineCredentialException ex)
    {
        Console.WriteLine($"error : {ex.Message}");
        Console.WriteLine($"error_description : {ex.Detail}");
    }
}

• LIFF Server API

using Line;
using Line.Liff;

using (var client = new LineLiffClient("access token"))
{
    try
    {
        var liffs = await client.GetAllLiffAppsAsync();

        foreach (var liff in liffs)
        {
            await client.DeleteLiffAppsFromChannelAsync(liff.LiffId);
        }
    }
    catch (LineException ex)
    {
        Console.WriteLine(ex.Message);

        foreach (var detail in ex.Details ?? Enumerable.Empty<Detail>())
        {
            Console.WriteLine(detail.Message);
            Console.WriteLine(detail.Property);
        }
    }
}

• LINE Login v2.1

using Line.Login;

using (LineLoginClient client = new LineLoginClient())
{
    var issued = await client.OAuth2dot1.IssueAccessTokenAsync("code", "redirectUrl", "clientId", "secret");
    var profile = await client.GetUserProfileAsync(issued.AccessToken);
}

• Messaging API reference
• How to serialize properties of derived classes with System.Text.Json
• System.Text.Json:How to specify a custom name for an enum value