вынесла в конфиг

BusinessLogic/BusinessLogic.csproj

@@ -6,6 +6,10 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="System.Configuration.ConfigurationManager" Version="7.0.0" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\TransportGuideContracts\TransportGuideContracts.csproj" />
   </ItemGroup>

TransportGuide/App.config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <appSettings>
+    <add key="connectToDb" value="Host=192.168.56.101;Port=5432;Database=TransportSubd;Username=postgres;Password=1502"/>
+  </appSettings>
+</configuration>

TransportGuide/TransportGuide.csproj

@@ -14,6 +14,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <PackageReference Include="System.Configuration.ConfigurationManager" Version="7.0.0" />
   </ItemGroup>
 
   <ItemGroup>

TransportGuideContracts/TransportGuideContracts.csproj

@@ -6,6 +6,10 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="System.Configuration.ConfigurationManager" Version="7.0.0" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\TransportGuideDataModels\TransportGuideDataModels.csproj" />
   </ItemGroup>

TransportGuideDataModels/TransportGuideDataModels.csproj

@@ -8,6 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="7.0.5" />
+    <PackageReference Include="System.Configuration.ConfigurationManager" Version="7.0.0" />
   </ItemGroup>
 
 </Project>

TransportGuideDatabaseImplements/TransportGuideDB.cs

@@ -2,6 +2,7 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Configuration;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -11,12 +12,14 @@ namespace TransportGuideDatabaseImplements
 {
     public class TransportGuideDB : DbContext
     {
+		string dbName = ConfigurationManager.AppSettings["connectToDb"];
+
 
 		protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
 		{
 			if (optionsBuilder.IsConfigured == false)
 			{
-				optionsBuilder.UseNpgsql("Host=192.168.56.101;Port=5432;Database=TransportSubd;Username=postgres;Password=1502");
+				optionsBuilder.UseNpgsql(dbName);
 			}
 			base.OnConfiguring(optionsBuilder);
 		}

TransportGuideDatabaseImplements/TransportGuideDatabaseImplements.csproj

@@ -13,6 +13,7 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="7.0.4" />
+    <PackageReference Include="System.Configuration.ConfigurationManager" Version="7.0.0" />
   </ItemGroup>
 
   <ItemGroup>