首先创建一个asp.net core web应用程序
第二步
目前官方预置了7种模板项目供我们选择。从中我们可以看出，既有我们熟悉的mvc、webapi，又新添加了razor page，以及结合比较流行的angular、react前端框架的模板项目。
空项目模板
program.cs
using system;
using system.collections.generic;
using system.io;
using system.linq;
using system.threading.tasks;
using microsoft.aspnetcore;
using microsoft.aspnetcore.hosting;
using microsoft.extensions.configuration;
using microsoft.extensions.logging;
namespace webapplication6
{
public class program
{
public static void main(string[] args)
{
createwebhostbuilder(args).build().run();
}
public static iwebhostbuilder createwebhostbuilder(string[] args) =>
webhost.createdefaultbuilder(args)
.usestartup<startup>();
}
}
实质就是控制台应用
startup.cs
using system;
using system.collections.generic;
using system.linq;
using system.threading.tasks;
using microsoft.aspnetcore.builder;
using microsoft.aspnetcore.hosting;
using microsoft.aspnetcore.http;
using microsoft.aspnetcore.httpspolicy;
using microsoft.aspnetcore.mvc;
using microsoft.extensions.configuration;
using microsoft.extensions.dependencyinjection;
namespace webapplication6
{
public class startup
{
public startup(iconfiguration configuration)
{
configuration = configuration;
}
public iconfiguration configuration { get; }
// this method gets called by the runtime. use this method to add services to the container.
public void configureservices(iservicecollection services)
{
services.configure<cookiepolicyoptions>(options =>
{
// this lambda determines whether user consent for non-essential cookies is needed for a given request.
options.checkconsentneeded = context => true;
options.minimumsamesitepolicy = samesitemode.none;
});
services.addmvc().setcompatibilityversion(compatibilityversion.version_2_1);
}
// this method gets called by the runtime. use this method to configure the http request pipeline.
public void configure(iapplicationbuilder app, ihostingenvironment env)
{
if (env.isdevelopment())
{
app.usedeveloperexceptionpage();
}
else
{
app.useexceptionhandler("/error");
app.usehsts();
}
app.usehttpsredirection();
app.usestaticfiles();
app.usecookiepolicy();
app.usemvc();
}
}
}
提供最原始的httpcontext。
web api
创建完整的http服务，使用controller处理请求，仅返回数据无视图返回
using system;
using system.collections.generic;
using system.linq;
using system.threading.tasks;
using microsoft.aspnetcore.mvc;
namespace webapplication7.controllers
{
[route("api/[controller]")]
[apicontroller]
public class valuescontroller : controllerbase
{
// get api/values
[httpget]
public actionresult<ienumerable<string>> get()
{
return new string[] { "value1", "value2" };
}
// get api/values/5
[httpget("{id}")]
public actionresult<string> get(int id)
{
return "value";
}
// post api/values
[httppost]
public void post([frombody] string value)
{
}
// put api/values/5
[httpput("{id}")]
public void put(int id, [frombody] string value)
{
}
// delete api/values/5
[httpdelete("{id}")]
public void delete(int id)
{
}
}
}
startup.cs也加入了相关的mvc的服务和中间件
using system;
using system.collections.generic;
using system.linq;
using system.threading.tasks;
using microsoft.aspnetcore.builder;
using microsoft.aspnetcore.hosting;
using microsoft.aspnetcore.http;
using microsoft.aspnetcore.httpspolicy;
using microsoft.aspnetcore.mvc;
using microsoft.extensions.configuration;
using microsoft.extensions.dependencyinjection;
namespace webapplication6
{
public class startup
{
public startup(iconfiguration configuration)
{
configuration = configuration;
}
public iconfiguration configuration { get; }
// this method gets called by the runtime. use this method to add services to the container.
public void configureservices(iservicecollection services)
{
services.configure<cookiepolicyoptions>(options =>
{
// this lambda determines whether user consent for non-essential cookies is needed for a given request.
options.checkconsentneeded = context => true;
options.minimumsamesitepolicy = samesitemode.none;
});
services.addmvc().setcompatibilityversion(compatibilityversion.version_2_1);
}
// this method gets called by the runtime. use this method to configure the http request pipeline.
public void configure(iapplicationbuilder app, ihostingenvironment env)
{
if (env.isdevelopment())
{
app.usedeveloperexceptionpage();
}
else
{
app.useexceptionhandler("/error");
app.usehsts();
}
app.usehttpsredirection();
app.usestaticfiles();
app.usecookiepolicy();
app.usemvc();
}
}
}
web 应用程序-razor page
在asp.net mvc中razor作为一个高级视图引擎存在，razor提供了一种新的标记语义，其大大减少了用户输入且具有表现力，主要的特点是使用@符号去书写标记。 而在asp.net core中razor不仅仅是一种视图引擎，其提供了一种新的页面设计方式——razor page。其主要的特点在于：
- 基于文件路径的路由系统；
- razor page类似于webform，一种mvvm的架构，支持双向绑定；
- razor page符合单一职责原则，每个页面独立存在，视图和代码紧密组织在一起。
web 应用程序-mvc
using system;
using system.collections.generic;
using system.diagnostics;
using system.linq;
using system.threading.tasks;
using microsoft.aspnetcore.mvc;
using webapplication5.models;
namespace webapplication5.controllers
{
public class homecontroller : controller
{
public iactionresult index()
{
return view();
}
public iactionresult about()
{
viewdata["message"] = "your application description page.";
return view();
}
public iactionresult contact()
{
viewdata["message"] = "your contact page.";
return view();
}
public iactionresult privacy()
{
return view();
}
[responsecache(duration = 0, location = responsecachelocation.none, nostore = true)]
public iactionresult error()
{
return view(new errorviewmodel { requestid = activity.current?.id ?? httpcontext.traceidentifier });
}
}
}
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