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これまで通り、dotnet コマンドで SDK テンプレートを使って色々なアプリケーションを作成できる様になっている。dotnet 3.0 から使える SDK テンプレートは以下の通り。

使用法: new [options]

  -h, --help          Displays help for this command.
  -l, --list          Lists templates containing the specified name. If no name is specified, lists all templates.
  -n, --name          The name for the output being created. If no name is specified, the name of the current directory is used.
  -o, --output        Location to place the generated output.
  -i, --install       Installs a source or a template pack.
  -u, --uninstall     Uninstalls a source or a template pack.
  --nuget-source      Specifies a NuGet source to use during install.
  --type              Filters templates based on available types. Predefined values are "project", "item" or "other".
  --dry-run           Displays a summary of what would happen if the given command line were run if it would result in a template creation.
  --force             Forces content to be generated even if it would change existing files.
  -lang, --language   Filters templates based on language and specifies the language of the template to create.
  --update-check      Check the currently installed template packs for updates.
  --update-apply      Check the currently installed template packs for update, and install the updates.

Templates                                         Short Name               Language          Tags                                 
Console Application                               console                  [C#], F#, VB      Common/Console                       
Class library                                     classlib                 [C#], F#, VB      Common/Library                       
WPF Application                                   wpf                      [C#]              Common/WPF                           
WPF Class library                                 wpflib                   [C#]              Common/WPF                           
WPF Custom Control Library                        wpfcustomcontrollib      [C#]              Common/WPF                           
WPF User Control Library                          wpfusercontrollib        [C#]              Common/WPF                           
Windows Forms (WinForms) Application              winforms                 [C#]              Common/WinForms                      
Windows Forms (WinForms) Class library            winformslib              [C#]              Common/WinForms                      
Worker Service                                    worker                   [C#]              Common/Worker/Web                    
Unit Test Project                                 mstest                   [C#], F#, VB      Test/MSTest                          
NUnit 3 Test Project                              nunit                    [C#], F#, VB      Test/NUnit                           
NUnit 3 Test Item                                 nunit-test               [C#], F#, VB      Test/NUnit                           
xUnit Test Project                                xunit                    [C#], F#, VB      Test/xUnit                           
Razor Component                                   razorcomponent           [C#]              Web/ASP.NET                          
Razor Page                                        page                     [C#]              Web/ASP.NET                          
MVC ViewImports                                   viewimports              [C#]              Web/ASP.NET                          
MVC ViewStart                                     viewstart                [C#]              Web/ASP.NET                          
Blazor Server App                                 blazorserver             [C#]              Web/Blazor                           
ASP.NET Core Empty                                web                      [C#], F#          Web/Empty                            
ASP.NET Core Web App (Model-View-Controller)      mvc                      [C#], F#          Web/MVC                              
ASP.NET Core Web App                              webapp                   [C#]              Web/MVC/Razor Pages                  
ASP.NET Core with Angular                         angular                  [C#]              Web/MVC/SPA                          
ASP.NET Core with React.js                        react                    [C#]              Web/MVC/SPA                          
ASP.NET Core with React.js and Redux              reactredux               [C#]              Web/MVC/SPA                          
Razor Class Library                               razorclasslib            [C#]              Web/Razor/Library/Razor Class Library
ASP.NET Core Web API                              webapi                   [C#], F#          Web/WebAPI                           
ASP.NET Core gRPC Service                         grpc                     [C#]              Web/gRPC                             
dotnet gitignore file                             gitignore                                  Config                               
global.json file                                  globaljson                                 Config                               
NuGet Config                                      nugetconfig                                Config                               
Dotnet local tool manifest file                   tool-manifest                              Config                               
Web Config                                        webconfig                                  Config                               
Solution File                                     sln                                        Solution                             
Protocol Buffer File                              proto                                      Web/gRPC                             

    dotnet new mvc --auth Individual
    dotnet new --help

WinForms や WPF を使ったアプリケーションの開発もできる。すばらしい。

以下の手順でアプリケーションを作成すると、SayHello というメソッドを持った Greeter サービスが作られる。

$ dotnet new grpc -o mygrpc

proto ファイルは以下の通り。

syntax = "proto3";

option csharp_namespace = "mygrpc";

package Greet;

// The greeting service definition.
service Greeter {
  // Sends a greeting
  rpc SayHello (HelloRequest) returns (HelloReply);

// The request message containing the user's name.
message HelloRequest {
  string name = 1;

// The response message containing the greetings.
message HelloReply {
  string message = 1;

dotnet コマンドを使ってそのまま実行できる。

試しにこの proto ファイルから Go のクライアントを作って接続してみる。以下のコマンドで Go のクライアントが作られる。

$ go get github.com/golang/protobuf/protoc-gen-go
$ protoc --go_out=plugins=grpc:. greet.proto

以下がそのクライアントを使ったサンプル。dotnet のサーバ側はポート 5000 番で通常ソケットの HTTP、5001 番で HTTP/2 で通信可能。dotnet run コマンドでは HTTP 通信のサーバは起動しないので dotnet build でビルドし、bin 配下にある exe ファイルを実行する。この exe ファイル出力も今回の .NET Core 3.0 の新しい機能になる。

package main

import (

    pb "github.com/mattn/grpc-greeter/Greet"

func main() {
    conn, err := grpc.Dial("", grpc.WithInsecure())
    if err != nil {
        opts = append(opts, grpc.WithTransportCredentials(creds))
    defer conn.Close()
    client := pb.NewGreeterClient(conn)

    hello := &pb.HelloRequest{
        Name: "おるみん",

    result, err := client.SayHello(context.Background(), hello)
    if err != nil {


Hello おるみん
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