Code

.gitattributes

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+###############################################################################
+# Set default behavior to automatically normalize line endings.
+###############################################################################
+* text=auto
+
+###############################################################################
+# Set default behavior for command prompt diff.
+#
+# This is need for earlier builds of msysgit that does not have it on by
+# default for csharp files.
+# Note: This is only used by command line
+###############################################################################
+#*.cs     diff=csharp
+
+###############################################################################
+# Set the merge driver for project and solution files
+#
+# Merging from the command prompt will add diff markers to the files if there
+# are conflicts (Merging from VS is not affected by the settings below, in VS
+# the diff markers are never inserted). Diff markers may cause the following 
+# file extensions to fail to load in VS. An alternative would be to treat
+# these files as binary and thus will always conflict and require user
+# intervention with every merge. To do so, just uncomment the entries below
+###############################################################################
+#*.sln       merge=binary
+#*.csproj    merge=binary
+#*.vbproj    merge=binary
+#*.vcxproj   merge=binary
+#*.vcproj    merge=binary
+#*.dbproj    merge=binary
+#*.fsproj    merge=binary
+#*.lsproj    merge=binary
+#*.wixproj   merge=binary
+#*.modelproj merge=binary
+#*.sqlproj   merge=binary
+#*.wwaproj   merge=binary
+
+###############################################################################
+# behavior for image files
+#
+# image files are treated as binary by default.
+###############################################################################
+#*.jpg   binary
+#*.png   binary
+#*.gif   binary
+
+###############################################################################
+# diff behavior for common document formats
+# 
+# Convert binary document formats to text before diffing them. This feature
+# is only available from the command line. Turn it on by uncommenting the 
+# entries below.
+###############################################################################
+#*.doc   diff=astextplain
+#*.DOC   diff=astextplain
+#*.docx  diff=astextplain
+#*.DOCX  diff=astextplain
+#*.dot   diff=astextplain
+#*.DOT   diff=astextplain
+#*.pdf   diff=astextplain
+#*.PDF   diff=astextplain
+#*.rtf   diff=astextplain
+#*.RTF   diff=astextplain

Runny.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.27705.2000
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Runny", "Runny\Runny.csproj", "{2BBD4894-B2B0-4E5B-A226-92A71334CC5D}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{2BBD4894-B2B0-4E5B-A226-92A71334CC5D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{2BBD4894-B2B0-4E5B-A226-92A71334CC5D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{2BBD4894-B2B0-4E5B-A226-92A71334CC5D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{2BBD4894-B2B0-4E5B-A226-92A71334CC5D}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {934861F0-0D4F-43E7-B119-048325D872D6}
+	EndGlobalSection
+EndGlobal

Runny/App.cshtml

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+<!--
+    Configuring this here is temporary. Later we'll move the app config
+    into Program.cs, and it won't be necessary to specify AppAssembly.
+-->
+<Router AppAssembly=typeof(Program).Assembly />

Runny/Compiler.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.IO;
+using System.Reflection;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+
+namespace Runny
+{
+    public static class Compiler
+    {
+        public static Assembly LoadSource(string source)
+        {
+            var references = new List<MetadataReference>();
+            references.Add(MetadataReference.CreateFromFile(typeof(object).Assembly.Location));
+
+            var compilation = CSharpCompilation.Create("DynamicCode")
+                .WithOptions(new CSharpCompilationOptions(OutputKind.ConsoleApplication))
+                .AddReferences(references)
+                .AddSyntaxTrees(CSharpSyntaxTree.ParseText(source));
+
+            ImmutableArray<Diagnostic> diagnostics = compilation.GetDiagnostics();
+
+            bool error = false;
+            foreach (Diagnostic diag in diagnostics)
+            {
+                switch (diag.Severity)
+                {
+                    case DiagnosticSeverity.Info:
+                        Console.WriteLine(diag.ToString());
+                        break;
+                    case DiagnosticSeverity.Warning:
+                        Console.WriteLine(diag.ToString());
+                        break;
+                    case DiagnosticSeverity.Error:
+                        error = true;
+                        Console.Error.WriteLine(diag.ToString());
+                        break;
+                }
+            }
+
+            if (error)
+            {
+                throw new Exception("Compilation failed");
+            }
+
+            using (var outputAssembly = new MemoryStream())
+            {
+                compilation.Emit(outputAssembly);
+
+                return Assembly.Load(outputAssembly.ToArray());
+            }
+        }
+
+        public static string Format(string source)
+        {
+            var tree = CSharpSyntaxTree.ParseText(source);
+            var root = tree.GetRoot();
+            var normalized = root.NormalizeWhitespace();
+            return normalized.ToString();
+        }
+    }
+}

Runny/Pages/Index.cshtml

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+@page "/"
+@inherits IndexModel
+
+<textarea bind="@Code" rows="20" cols="100"></textarea>
+<button class="btn" onclick="@Run">Run</button>
+<textarea bind="@Output" rows="20" cols="100"></textarea>

Runny/Pages/Index.cshtml.cs

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+using System;
+using System.IO;
+using Microsoft.AspNetCore.Blazor.Components;
+
+namespace Runny.Pages
+{
+    public class IndexModel : BlazorComponent
+    {
+        public string Output = "";
+        public string Code = @"using System;
+
+class Program
+{
+    public static void Main()
+    {
+        Console.WriteLine(""Hello World"");
+    }
+}";
+
+        public void Run()
+        {
+            Output = "";
+            var asm = Compiler.LoadSource(Code);
+            var hasArgs = asm.EntryPoint.GetParameters().Length > 0;
+
+            var currentOut = Console.Out;
+            var writer = new StringWriter();
+            Console.SetOut(writer);
+
+            Exception exception = null;
+            try
+            {
+                asm.EntryPoint.Invoke(null, hasArgs ? new string[][] { null } : null);
+            }
+            catch (Exception ex)
+            {
+                exception = ex;
+            }
+            Output = writer.ToString();
+            if (exception != null)
+            {
+                Output += "\r\n" + exception.ToString();
+            }
+            Console.SetOut(currentOut);
+        }
+    }
+}

Runny/Pages/_ViewImports.cshtml

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+@layout MainLayout

Runny/Program.cs

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+using Microsoft.AspNetCore.Blazor.Browser.Rendering;
+using Microsoft.AspNetCore.Blazor.Browser.Services;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+
+namespace Runny
+{
+    public class Program
+    {
+        static void Main(string[] args)
+        {
+            var serviceProvider = new BrowserServiceProvider(services =>
+            {
+                // Add any custom services here
+            });
+
+            new BrowserRenderer(serviceProvider).AddComponent<App>("app");
+        }
+    }
+}

Runny/Runny.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <RunCommand>dotnet</RunCommand>
+    <RunArguments>blazor serve</RunArguments>
+    <RestoreSources>
+      $(RestoreSources);
+      https://api.nuget.org/v3/index.json;
+      https://dotnet.myget.org/f/blazor-dev/api/v3/index.json;
+    </RestoreSources>
+    <LangVersion>7.3</LangVersion>
+    <BlazorLinkOnBuild>false</BlazorLinkOnBuild>
+    <!--<AdditionalMonoLinkerOptions>- -skip-unresolved true</AdditionalMonoLinkerOptions>-->
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="2.7.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Blazor.Browser" Version="0.4.0-preview1-10298" />
+    <PackageReference Include="Microsoft.AspNetCore.Blazor.Build" Version="0.4.0-preview1-10298" />
+    <DotNetCliToolReference Include="Microsoft.AspNetCore.Blazor.Cli" Version="0.4.0-preview1-10298" />
+  </ItemGroup>
+
+</Project>

Runny/Shared/MainLayout.cshtml

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+@inherits BlazorLayoutComponent
+
+<div class="sidebar">
+    <NavMenu />
+</div>
+
+<div class="main">
+    <div class="top-row px-4">
+        <a href="http://blazor.net" target="_blank" class="ml-md-auto">About</a>
+    </div>
+
+    <div class="content px-4">
+        @Body
+    </div>
+</div>

Runny/Shared/NavMenu.cshtml

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+<div class="top-row pl-4 navbar navbar-dark">
+    <a class="navbar-brand" href="">Runny</a>
+    <button class="navbar-toggler" onclick=@ToggleNavMenu>
+        <span class="navbar-toggler-icon"></span>
+    </button>
+</div>
+
+<div class=@(collapseNavMenu ? "collapse" : null) onclick=@ToggleNavMenu>
+    <ul class="nav flex-column">
+        <li class="nav-item px-3">
+            <NavLink class="nav-link" href="" Match=NavLinkMatch.All>
+                <span class="oi oi-home" aria-hidden="true"></span> Home
+            </NavLink>
+        </li>
+    </ul>
+</div>
+
+@functions {
+    bool collapseNavMenu = true;
+
+    void ToggleNavMenu()
+    {
+        collapseNavMenu = !collapseNavMenu;
+    }
+}

Runny/_ViewImports.cshtml

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+@using System.Net.Http
+@using Microsoft.AspNetCore.Blazor.Layouts
+@using Microsoft.AspNetCore.Blazor.Routing
+@using Runny
+@using Runny.Shared

Runny/global.json

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+{
+  "sdk": {
+    "version": "2.1.300-preview2-008533"
+  }
+}