GitLabApiClient is a .NET rest client for GitLab API v4 (https://docs.gitlab.com/ce/api/README.html).

1. Targets .NET Standard 2.0.
2. Fully async.
3. Thread safe.
4. Multi core paging.
5. Simple and natural to use.

1. Authenticate:

// if you have auth token:
var client =  new GitLabClient("https://gitlab.example.com", "your_private_token");

// if you want to use username & password:
var client =  new GitLabClient("https://gitlab.example.com");
await client.LoginAsync("username", "password");

2. Use it:

// create a new issue.
await client.Issues.CreateAsync(new CreateIssueRequest("projectId", "issue title"));  

// list issues for a project  with specified assignee and labels.
await client.Issues.GetAsync("projectId", o => o.AssigneeId = 100 && o.Labels == new[] { "test-label" });

// create a new merge request featureBranch -> master.
await client.MergeRequests.CreateAsync(new CreateMergeRequest("projectId", "featureBranch", "master", "Merge request title")
{
    Labels = new[] { "bugfix" },
    Description = "Implement feature"
}); 

1. Issues API:
   Create issue.
   Update issue.
   Query issues.

2. Merges API:
   Create merge request.
   Update merge request.
   Accept merge request.
   Delete merge request.
   Query merge requests.

3. Projects API: Create project.
   Update project.
   Delete project.
   Get project users.
   Query projects.
   Archive/Unarchive
   Labels (contributed by @DTeuchert)
   Milestones (contributed by @DTeuchert)

4. Users API:
   Create user.
   Update user.
   Delete user.
   Get current user session.
   Query users.

5. Groups API (contributed by @ilijamitkov):
   Create group.
   Get projects for a group.
   Transfer group.
   Update group.
   Delete group.
   Sync group with linked LDAP group.
   Create LDAP group link.
   Delete LDAP group link.
   Delete LDAP for a specific LDAP provider.
   Query groups.
   Milestones. (contributed by @DTeuchert)