several more methods

Program.cs

@@ -9,8 +9,21 @@ namespace ttrss_co_client
             var conf = Configure();
             var ttrssClient = new ttrss.ApiClient(conf.BaseURI);
             await ttrssClient.Login(conf.Username, conf.Password);
+
+            var loggedin = await ttrssClient.IsLoggedIn();
+            Console.WriteLine($"logged in: {loggedin}");
+
             var apiLevel = await ttrssClient.GetApiLevel();
-            Console.WriteLine(apiLevel);
+            Console.WriteLine($"api level: {apiLevel}");
+
+            var unread = await ttrssClient.GetUnread();
+            Console.WriteLine($"{unread} unread article{(unread == 1 ? "" : "s")}");
+            
+            var loggedout = await ttrssClient.Logout();
+            Console.WriteLine($"logged out: {loggedout}");
+
+             loggedin = await ttrssClient.IsLoggedIn();
+            Console.WriteLine($"logged in: {loggedin}");
         }
         static Configuration Configure(string configurationPath = "appsettings.json")
         {

ttrss/ApiClient.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.ComponentModel;
 using Newtonsoft.Json;
 using System.Net.Http.Json;
 
@@ -11,7 +12,7 @@ namespace ttrss_co_client.ttrss
         public Uri BaseURI { get; private set; }
         private HttpClient httpClient { get; set; }
         private string SessionId { get; set; } = null;
-        private int api_level{get;set;}
+        private int api_level { get; set; }
 
         public ApiClient(Uri baseUri)
         {
@@ -45,36 +46,26 @@ namespace ttrss_co_client.ttrss
         public async Task<int> GetApiLevel()
         {
             assertInitialized();
-
+            return await oneValueGet<int>("getApiLevel", "level");
-            var json =JsonContent.Create(new
-            {
-                op = "getApiLevel",
-                sid = this.SessionId
-            });
-            var response = await (await httpClient.PostAsync(BaseURI, json)).Content.ReadAsStringAsync();
-            var apiResult = JsonConvert.DeserializeObject<ttrss.messages.GenericApiResponse>(response);
-            int level = 0;
-            if(int.TryParse(apiResult.Content["level"], out level))
-                return level;
-            else
-                return 0;
         }
 
         public async Task<bool> Logout()
         {
             assertInitialized();
-            throw new NotImplementedException();
+
+            return (await oneValueGet<string>("logout", "status"))?.ToLower() == "ok";
         }
         public async Task<bool> IsLoggedIn()
         {
-            assertInitialized();
+            //assertInitialized();
-            throw new NotImplementedException();
+            return (await oneValueGet<bool>("isLoggedIn", "status"));
         }
         public async Task<int> GetUnread()
         {
             assertInitialized();
-            throw new NotImplementedException();
+            return await oneValueGet<int>("getUnread", "unread");
         }
+
         public async Task GetFeeds(int cat_id, bool unread_only, int limit, int offset, bool include_nested)
         {
             assertInitialized();
@@ -155,7 +146,7 @@ namespace ttrss_co_client.ttrss
         public async Task GetLabels(int? article_id)
         {
             assertInitialized();
-            if(article_id != null)
+            if (article_id != null)
             {
                 assertApiLevel(5);
             }
@@ -171,7 +162,7 @@ namespace ttrss_co_client.ttrss
         {
             assertInitialized();
             assertApiLevel(4);
-            if(!sanitize)
+            if (!sanitize)
                 assertApiLevel(20);
             throw new NotImplementedException();
         }
@@ -206,10 +197,37 @@ namespace ttrss_co_client.ttrss
         }
         private void assertApiLevel(int ApiLevel)
         {
-            if(ApiLevel > this.api_level)
+            if (ApiLevel > this.api_level)
             {
                 throw new NotSupportedException($"method requires api level {ApiLevel}, have {this.api_level}");
             }
         }
+
+
+        private async Task<T> oneValueGet<T>(string op, string key)
+        {
+            //mostly you post {"op": "aThingToDo", "sid": "sessionId", "some other param": "some other value"}
+            //and get back something like {"seq": 0, "status", "content": {"the value you asked for": 0}}
+            var json = JsonContent.Create(new
+            {
+                op = op,
+                sid = this.SessionId
+            });
+            var response = await (await httpClient.PostAsync(BaseURI, json)).Content.ReadAsStringAsync();
+            var apiResult = JsonConvert.DeserializeObject<ttrss.messages.GenericApiResponse>(response);
+            try
+            {
+                var converter = TypeDescriptor.GetConverter(typeof(T));
+                if (converter != null)
+                {
+                    return (T)converter.ConvertFromString(apiResult.Content[key]);
+                }
+                return default(T);
+            }
+            catch (NotSupportedException)
+            {
+                return default(T);
+            }
+        }
     }
 }