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※This article is based on .NET 7
发送带有Set-Cookie标头的响应 现在，我们已经完成了设置Cookie的准备工作，接下来我们可以在控制器的某个方法中发送带有Set-Cookie标头的响应。以下是一个示例：
[HttpGet]
public IActionResult SetCookie()
{
var cookieOptions = new CookieOptions
{
Secure = true,
SameSite = SameSiteMode.None,
Expires = DateTime.Now.AddDays(1)
};
//添加Cookie
Response.Cookies.Append("token", "your_token_value", cookieOptions);
//删除某个Cookie
Response.Cookies.Delete(somekey);
return Ok("Cookie set successfully");
}
不直接使用父类 Controller 的 Request 和 HttpContext，这是因为此方式是一种强依赖，接下来给大家演示如何通过依赖注入的方式获取 HttpContext，此种更加灵活。
在 ASP.NET Core 中要想得到 cookie 必须要有 Request 对象，要想得到 Request 对象 必须要有 HttpContext，要想得到 HttpContext 必须要利用 IHttpContextAccessor 接口
public interface IHttpContextAccessor
{
HttpContext HttpContext { get; set; }
}
ASP.NET Core 中就内置了一个实现了该接口的 HttpContextAccessor 类
public class HttpContextAccessor : IHttpContextAccessor
{
public HttpContextAccessor();
public HttpContext HttpContext { get; set; }
}
为了实现依赖注入，需要将 IHttpContextAccessor 和 HttpContextAccessor 注入到 ServiceCollection 中，下面就用单例的模式进行注入 public void ConfigureServices(IServiceCollection services) {
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>(); // 逻辑代码
}
然后就可以通过依赖注入的方式获取 IHttpContextAccessor 接口的实例，再依次获取 HttpContext 对象，下面的代码片段展示了如何在 Controller 中访问 IHttpContextAccessor 实例
public class HomeController : Controller {
private readonly IHttpContextAccessor _httpContextAccessor;
public HomeController(IHttpContextAccessor httpContextAccessor)
{
this._httpContextAccessor = httpContextAccessor;
}
//写入Cookie
public IActionResult Write(string key, string value, bool isPersistent)
{
CookieOptions options = new CookieOptions();
if (isPersistent)
options.Expires = DateTime.Now.AddDays(1);
else
options.Expires = DateTime.Now.AddSeconds(10);
_httpContextAccessor.HttpContext.Response.Cookies.Append(key, value, options);
return View("WriteCookie");
}
}
public IActionResult Read(string key) {
ViewBag.Data = _httpContextAccessor.HttpContext.Request.Cookies[key];
return View("ReadCookie");
}
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