async await

Author: Anton Wieslander

Async Await Task/AsyncAwait/AsyncAwait.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29905.134
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AsyncAwait", "AsyncAwait\AsyncAwait.csproj", "{7A02E0EA-683C-4C03-A721-AF94813F439C}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{7A02E0EA-683C-4C03-A721-AF94813F439C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7A02E0EA-683C-4C03-A721-AF94813F439C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7A02E0EA-683C-4C03-A721-AF94813F439C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7A02E0EA-683C-4C03-A721-AF94813F439C}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1A45E28A-9071-475F-9F30-1BD2163588E6}
+	EndGlobalSection
+EndGlobal

Async Await Task/AsyncAwait/AsyncAwait/AsyncAwait.csproj

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

Async Await Task/AsyncAwait/AsyncAwait/Program.cs

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+using System;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace AsyncAwait
+{
+    class Program
+    {
+        static async Task Main(string[] args)
+        {
+			var client = new HttpClient();
+			var task = await client.GetStringAsync("https://google.com");
+
+			int a = 0;
+			for (int i = 0; i < 1_000_000; i++)
+			{
+				a = i + 1;
+			}
+			var task2 = await client.GetStringAsync("https://google.com");
+
+			Console.WriteLine("Hello World");
+		}
+    }
+}

Async Await Task/making_tea_analogy.linq

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+<Query Kind="Program">
+  <Namespace>System.Threading.Tasks</Namespace>
+</Query>
+
+async Task Main()
+{
+	await MakeTeaAsync();
+}
+
+
+public async Task<string> MakeTeaAsync()
+{
+	var boilingWater = BoilWaterAsync();
+
+	"take the cups out".Dump();
+
+	var a = 0;
+	for (int i = 0; i < 100_000_000; i++){
+		a += i;
+	}
+
+	"put tea in cups".Dump();
+	
+	var water = await boilingWater;
+
+	var tea = $"pour {water} in cups".Dump();
+
+	return tea;
+}
+
+public async Task<string> BoilWaterAsync()
+{
+	"Start the kettle".Dump();
+
+	"waiting for the kettle".Dump();
+	await Task.Delay(300);
+
+	"kettle finished boiling".Dump();
+
+	return "water";
+}
+
+public string MakeTea()
+{
+	var water = BoilWater();
+
+	"take the cups out".Dump();
+
+	"put tea in cups".Dump();
+
+	var tea = $"pour {water} in cups".Dump();
+
+	return tea;
+}
+
+public string BoilWater()
+{
+	"Start the kettle".Dump();
+	
+	"waiting for the kettle".Dump();
+	Task.Delay(2000).GetAwaiter().GetResult();
+	
+	"kettle finished boiling".Dump();
+	
+	return "water";
+}

Async Await Task/what_thread_are_we_on.linq

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+<Query Kind="Program">
+  <Namespace>System.Net.Http</Namespace>
+  <Namespace>System.Threading.Tasks</Namespace>
+</Query>
+
+async Task Main()
+{
+	//part 1
+	Thread.CurrentThread.ManagedThreadId.Dump("1");
+	var client = new HttpClient();
+	Thread.CurrentThread.ManagedThreadId.Dump("2");
+	var task = client.GetStringAsync("http://google.com");
+	Thread.CurrentThread.ManagedThreadId.Dump("3");
+
+	var a = 0;
+	for (int i = 0; i < 1_000_000; i++)
+	{
+		a += i;
+	}
+
+	Thread.CurrentThread.ManagedThreadId.Dump("4");
+	var page = await task;
+	// part 2
+	Thread.CurrentThread.ManagedThreadId.Dump("5");
+}