If you need to export your bug reports from your YouTrack instance, this is how to get it done using C#. Its a small example that will print all the issues,comments and attachments for each project in your instance.

Don’t forget to enable the REST API in your YourTrack settings page.

Create a new project called YouTrackExport and use NuGet to install the YouTrackSharp package

PM> Install-Package YouTrackSharp
Attempting to resolve dependency 'EasyHttp (≥ 1.6.29.0)'.
Attempting to resolve dependency 'JsonFX (≥ 2.0.1209.2802)'.
Installing 'JsonFx 2.0.1209.2802'.
...
...

The following code will print out the information:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Dynamic;
using YouTrackSharp.Infrastructure;
using YouTrackSharp.Projects;
using YouTrackSharp.Issues;
using YouTrackSharp.Admin;
using System.Net;

namespace YouTrackExport
{
    class Program
    {
        static void Main(string[] args)
        {
            String Username = "xxx";
            String Password = "yyy";
            String Site = "zzz.myjetbrains.com";

            YouTrackSharp.Infrastructure.Connection Connection;
            YouTrackSharp.Projects.ProjectManagement ProjectManager;
            IEnumerable<YouTrackSharp.Projects.Project> Projects;
            YouTrackSharp.Issues.IssueManagement IssueManager;
            IEnumerable<YouTrackSharp.Issues.Issue> Issues;
            IEnumerable<YouTrackSharp.Issues.Comment> Comments;


            Connection = new Connection(Site, 80, false, "youtrack");
            Connection.Authenticate(Username, Password);
                    
            ProjectManager = new ProjectManagement(Connection);
            Projects    = ProjectManager.GetProjects();
            foreach (Project project in Projects)
            {
               
                Console.WriteLine(String.Format("Found project {0} - {1} ", project.ShortName, project.Name));
                IssueManager = new IssueManagement(Connection);
                Issues = IssueManager.GetAllIssuesForProject(project.ShortName); 
                
                //An issue in youtrack can have many fields that we dont know at compile time.
                //Therefore its a .Net DynamicObject
                foreach (dynamic Issue in Issues) 
                {
                    Console.WriteLine(String.Format("\tFound issue {0}", Issue.Id));

                    Comments = IssueManager.GetCommentsForIssue(Issue.Id);
                    foreach (Comment Comment in Comments)
                    {
                        Console.WriteLine(String.Format("\t\tComment: {0} - {1} - {2}", Comment.Author, Comment.Created, Comment.Text));
                    }

                    foreach (dynamic Attachment in Issue.Attachments)
                    {
                        String Name = Attachment.name;
                        String Url = Attachment.url;
                        String Author = Attachment.authorLogin;
                        String Id = Attachment.id;
                        String Group = Attachment.group;
                        long Created = Attachment.created;
                        Console.WriteLine(String.Format("\t\tAttachment: {0} - {1} - {2}", Name, Author, Url));
                    }
                }
            }
        }
    }
}

Some gotcha’s that I encountered

The following code wont work if your YouTrack instance is hosted in the cloud:

var connection = new Connection("http://zzz.myjetbrains.com/youtrack"); 
var connection = new Connection("zzz.myjetbrains.com/youtrack"); 
var connection = new Connection("zzz.myjetbrains.com"); 

The following code will raise a HTTPException: NotFound Not Found exception. You need to to use the ShortName member:

Issues = IssueManager.GetAllIssuesForProject(project.Name);