some fix

.vs/VSWorkspaceState.json

@@ -0,0 +1,8 @@
+{
+  "ExpandedNodes": [
+    "",
+    "\\Controllers"
+  ],
+  "SelectedNode": "\\Program.cs",
+  "PreviewInSolutionExplorer": false
+}

Controllers/DeletePost.cs

@@ -0,0 +1,19 @@
+using Microsoft.AspNetCore.Mvc;
+using System.Data;
+using System.Text.Json;
+
+namespace NeDvachAPI.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class DeletePostController : ControllerBase
+    {
+        [HttpDelete("{id}")]
+        public JsonResult Get(string id)
+        {
+            DBchat.DeletePost(id);
+            return new JsonResult("Deleted Successfully!");
+
+        }
+    }
+}

Controllers/GetPosts.cs

@@ -12,8 +12,10 @@ namespace NeDvachAPI.Controllers
         {
             Post[] posts  = DBchat.DbList();
             string postsJson = JsonSerializer.Serialize(posts);
+            Console.WriteLine("Запрошен список постов.");
             return postsJson ;
 
+
         }
     }
 }

Controllers/PostPost.cs

@@ -8,9 +8,11 @@ namespace NeDvachAPI.Controllers
     public class PostToController : ControllerBase
     {
         [HttpPost(Name = "PostPosts")]
-        public void ReceivePost([FromBody] Post ReceivedPost)
+        public JsonResult ReceivePost([FromBody] Post ReceivedPost)
         {
+            Console.WriteLine("Принят пост");
             DBchat.SendPost(ReceivedPost);
+            return new JsonResult("Posted Successfully!");
         }
     }
 }

Controllers/TestPosting.cs

@@ -1,4 +1,5 @@
 using Microsoft.AspNetCore.Mvc;
+using System.Net;
 using System.Text.Json;
 
 namespace NeDvachAPI.Controllers
@@ -8,10 +9,11 @@ namespace NeDvachAPI.Controllers
     public class TestPostingController : ControllerBase
     {
         [HttpPost]
-        public int Area(int altitude , int height)
+        public int Area([FromForm] int height , int altitude)
         {
             //DBchat.SendPost(ReceivedPost);
-            return altitude+height;
+            Console.WriteLine("Received! " + height + " " + altitude );
+            return 200;
         }
     }
 }

DBchat.cs

@@ -1,4 +1,5 @@
 using Npgsql;
+using static System.Net.Mime.MediaTypeNames;
 
 namespace NeDvachAPI
 {
@@ -131,5 +132,37 @@ namespace NeDvachAPI
 
             Console.WriteLine("С добавлением закончено");
         }
+        public static void DeletePost(string idToDel) //удалялка
+        {
+            string connString =
+                String.Format(
+                    "Server={0}; User Id={1}; Database={2}; Port={3}; Password={4};SSLMode=Prefer",
+                    Host,
+                    User,
+                    DBname,
+                    Port,
+                    Password);
+
+            using (var conn = new NpgsqlConnection(connString))
+            {
+
+                //Console.Out.WriteLine("Opening connection");
+                conn.Open();
+
+                using (var command = new NpgsqlCommand(@"
+                DELETE FROM dvach 
+                WHERE post_id = @ID", conn))
+                {
+                    command.Parameters.AddWithValue("ID", int.Parse(idToDel)); ;
+
+                    int nRows = command.ExecuteNonQuery();
+                    Console.Out.WriteLine(String.Format("Number of rows updated={0}", nRows));
+                }
+            }
+
+            Console.WriteLine("Данные удалены!");
+            Console.ReadLine();
+
+        }
     }
 }

NeDvachAPI.csproj.user

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <Controller_SelectedScaffolderID>MvcControllerEmptyScaffolder</Controller_SelectedScaffolderID>
+    <Controller_SelectedScaffolderID>MvcControllerWithActionsScaffolder</Controller_SelectedScaffolderID>
     <Controller_SelectedScaffolderCategoryPath>root/Common/MVC/Controller</Controller_SelectedScaffolderCategoryPath>
   </PropertyGroup>
 </Project>

Post.cs

@@ -8,4 +8,11 @@ namespace NeDvachAPI
 
         public string Text { get; set; }
     }
+
+    public class ReceivedValues
+    {
+        public string height { get; set; }
+
+        public string altitude { get; set; }
+    }
 }

Program.cs

@@ -3,9 +3,17 @@ var builder = WebApplication.CreateBuilder(args);
 // Add services to the container.
 
 builder.Services.AddControllers();
-// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+
 builder.Services.AddEndpointsApiExplorer();
-//builder.Services.AddSwaggerGen();
+
+builder.Services.AddCors(setup =>
+{
+    setup.AddDefaultPolicy(policyBuilder =>
+    {
+        policyBuilder.WithOrigins("http://www.vdk2ch.ru:4200").WithMethods("PUT", "POST").WithHeaders("*");
+    });
+
+});
 
 var app = builder.Build();
 
@@ -18,6 +26,8 @@ if (app.Environment.IsDevelopment())
 
 //app.UseHttpsRedirection();
 
+app.UseCors();
+
 app.UseAuthorization();
 
 app.MapControllers();