Post Json data

CS029_Networking/3.HttpClientExampleSendAsync/.vscode/launch.json

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+{
+   // Use IntelliSense to find out which attributes exist for C# debugging
+   // Use hover for the description of the existing attributes
+   // For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
+   "version": "0.2.0",
+   "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            // If you have changed target frameworks, make sure to update the program path.
+            "program": "${workspaceFolder}/bin/Debug/netcoreapp3.1/HttpClientExample.dll",
+            "args": [],
+            "cwd": "${workspaceFolder}",
+            // For more information about the 'console' field, see https://aka.ms/VSCode-CS-LaunchJson-Console
+            "console": "internalConsole",
+            "stopAtEntry": false
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command:pickProcess}"
+        }
+    ]
+}

CS029_Networking/3.HttpClientExampleSendAsync/.vscode/tasks.json

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+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "build",
+                "${workspaceFolder}/HttpClientExample.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "publish",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "publish",
+                "${workspaceFolder}/HttpClientExample.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "watch",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "watch",
+                "run",
+                "${workspaceFolder}/HttpClientExample.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}

CS029_Networking/3.HttpClientExampleSendAsync/HttpClientExample.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

CS029_Networking/3.HttpClientExampleSendAsync/Program.cs

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+using System;
+using System.Linq;
+using System.Net;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Threading;
+using System.Threading.Tasks;
+using System.IO;
+using System.Text;
+namespace HttpClientExample
+{
+    public class ViduHttpClient {
+        HttpClient _httpClient = null;
+        public HttpClient httpClient => _httpClient ?? (new HttpClient());
+
+        // Post Json Data
+        public async Task<string> SendAsyncJson(string url, string json) 
+        {
+            Console.WriteLine($"Starting connect {url}");
+            try {
+
+                var request = new HttpRequestMessage(HttpMethod.Post, url);
+                HttpContent httpContent = new StringContent(json, Encoding.UTF8, "application/json");
+                request.Content = httpContent;
+                var response = await httpClient.SendAsync(request);
+                var rcontent = await response.Content.ReadAsStringAsync();
+                return rcontent;
+
+            } catch (Exception e) {
+                Console.WriteLine(e.Message);
+                throw e;
+            }
+        }
+    }
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var url = "https://xuanthulab.net/api/";
+            var json =@"
+                {
+                    ""id"":""1"", 
+                    ""method"":""timestampToDate"", 
+                    ""params"": {""routin"":""UnixTime"", ""timestamp"":""1483228800""}
+                }";
+           ViduHttpClient vidu = new ViduHttpClient();
+           var task = vidu.SendAsyncJson(url, json);
+           task.Wait();
+           Console.WriteLine(task.Result);  
+        }
+    }
+}