webapi跨域使用session的方法示例

@{
  ViewBag.Title = "TestSetSession";
}

<h2>TestSetSession</h2>

<button onclick="Set()">设置session</button>

@section scripts{
<script src="/UploadFiles/2021-04-02/jquery-1.10.2.min.js">

然后再来个页面，获取上个页面设置的session。


@{
  ViewBag.Title = "TestGetSession";
}

<h2>TestGetSession</h2>
<button onclick="Get()">获取session</button>

@section scripts{
<script src="/UploadFiles/2021-04-02/jquery-1.10.2.min.js">

后台代码
1.先允许webapi使用session
在global中加入如下代码


public override void Init()
    {
      PostAuthenticateRequest += MvcApplication_PostAuthenticateRequest;
      base.Init();
    }

    void MvcApplication_PostAuthenticateRequest(object sender, EventArgs e)
    {
      System.Web.HttpContext.Current.SetSessionStateBehavior(
        System.Web.SessionState.SessionStateBehavior.Required);
    }


2.允许跨域。我这里使用的是Microsoft.AspNet.WebApi.Cors
先安装包，然后在WebApiConfig中加入如下代码。等同于在web.config中设置


 //允许跨域
  config.EnableCors(new EnableCorsAttribute("*", "*", "*"));


在请求方法上打上[EnableCors]标签，特指某一些域名的访问需要cookie/session


[EnableCors("http://localhost:6477,http://localhost:6478", "*","*")]
  public class TestController : ApiController
  {
    /// <summary>
    /// 设置session
    /// </summary>
    /// <returns></returns>
    public dynamic SetSession(string session)
    {
      HttpContext.Current.Response.AddHeader("Access-Control-Allow-Credentials", "true");
      //缓存state
      HttpContext.Current.Session["session_test"] = session;
      HttpCookie cookie = new HttpCookie("cookie_test")
      {
        Value = session,
        Expires = DateTime.Now.AddHours(1)
      };
      HttpContext.Current.Response.Cookies.Add(cookie);
      return new 
      {
        success = true,
        message = "设置session"
      };
    }

    /// <summary>
    /// 获取session
    /// </summary>
    /// <returns></returns>
    public dynamic GetSession()
    {
      HttpContext.Current.Response.AddHeader("Access-Control-Allow-Credentials", "true");
      var session = HttpContext.Current.Session["session_test"];
      HttpCookie _cookie = HttpContext.Current.Request.Cookies["cookie_test"];
      var cookie = _cookie"";
      string session_state = session == null "" : session.ToString();
      return new 
      {
        success = true,
        message = "获取session",
        data = new { session_state, cookie }
      };
    }


结果：


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