Add project files.

AuthentificationExample.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.9.34714.143
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AuthentificationExample", "ConsoleApp1\AuthentificationExample.csproj", "{CAB00FAC-2646-4ACF-B82D-7B5CD25D2D0A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{CAB00FAC-2646-4ACF-B82D-7B5CD25D2D0A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CAB00FAC-2646-4ACF-B82D-7B5CD25D2D0A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CAB00FAC-2646-4ACF-B82D-7B5CD25D2D0A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CAB00FAC-2646-4ACF-B82D-7B5CD25D2D0A}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {8E3A9267-5264-4EB3-8B2F-8D5E5D2451C0}
+	EndGlobalSection
+EndGlobal

ConsoleApp1/AuthentificationExample.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RestSharp" Version="112.1.0" />
+  </ItemGroup>
+
+</Project>

ConsoleApp1/JwtToken.cs

@@ -0,0 +1,8 @@
+// See https://aka.ms/new-console-template for more information
+using System.Text.Json.Serialization;
+
+internal class JwtToken
+{
+    [JsonPropertyName("access_token")]
+    public string AccessToken { get; set; }
+}

ConsoleApp1/Program.cs

@@ -0,0 +1,37 @@
+// See https://aka.ms/new-console-template for more information
+using RestSharp;
+using System.Text.Json;
+
+var keyCloackHost = "localhost:8080";
+var webApiHost = "localhost:44358";
+
+var restClient = new RestClient();
+var request = new RestRequest($"http://{keyCloackHost}/realms/TestRealm/protocol/openid-connect/token", Method.Post);
+//параметры для body
+request.AddParameter("username", "myuser");
+request.AddParameter("password", 123456);
+request.AddParameter("client_id", "public-client");
+request.AddParameter("grant_type", "password");
+
+var keyCloackResponse = await restClient.PostAsync(request);
+if (keyCloackResponse.IsSuccessful)
+{
+    var token = JsonSerializer.Deserialize<JwtToken>(keyCloackResponse.Content);
+    var access_token = token.AccessToken;
+
+    var webApiRequest = new RestRequest($"https://{webApiHost}/WeatherForecast", Method. Get);
+    webApiRequest.AddHeader("Authorization", "Bearer " + access_token);
+
+    var webApiResponse = await restClient.GetAsync(webApiRequest);
+    if (webApiResponse.IsSuccessful) {
+        Console.WriteLine(webApiResponse.Content);
+    }
+    else
+    {
+        Console.WriteLine(webApiResponse.StatusDescription);
+    }
+}
+else
+{
+    Console.WriteLine(keyCloackResponse.StatusDescription);
+}

ConsoleApp1/appsettings.json

@@ -0,0 +1,13 @@
+{
+  "KeyClockSettings": {
+    "BaseUri":  "http://localhost:8080"
+  }
+  "exclude": [
+    "**/bin",
+    "**/bower_components",
+    "**/jspm_packages",
+    "**/node_modules",
+    "**/obj",
+    "**/platforms"
+  ]
+}