asp net core mvc 跨域ajax解决方案

1、配置服务端

在Startup文件中国配置Cors策略：

　　　　　　　IEnumerable<Client> clients= Configuration.GetSection("Clients").Get(typeof(IEnumerable<Client>)) as IEnumerable<Client>;
 
            List<string> urls = new List<string>();
            foreach (var client in clients)
            {
                urls.AddRange(client.AllowedCorsOrigins);
            }
            services.AddCors(options =>
            {
                options.AddPolicy("default",
                    builder => builder.WithOrigins(urls.ToArray())
                                    .AllowAnyHeader()
                                    .AllowCredentials()
                                    .AllowAnyMethod());
            });

启用CORS策略，可以在Startup文件中配置，也可以在具体的ApiController中配置，代码分别如下：

 app.UseCors("default");

    [Authorize]
    [EnableCors("default")]
    public class NavigationMenuController:Controller
    {
        private NavigationMenuService navigationMenuService;
 
        public NavigationMenuController(NavigationMenuService navigationMenuService)
        {
            this.navigationMenuService = navigationMenuService;
        }
    }

2、JQuery请求

        $.ajax({
            url: 'http://localhost:5000/api/Private/Values/Identity',
            type: 'GET',
            dataType: 'json',
            crossDomain: true,
            xhrFields: {
                withCredentials: true
            },
            success: function (result) {
                $('#platformResult').val(JSON.stringify(result));
            }
        });

红字是关键 ，值得注意的是需要配置 withCredentials，否则请求不会带上Cookie。

3、 axios请求

      axios({
        url:
        config.authority +
        "/api/xxxxxxxxxx?clientId=" +
        escape(config.client_id),
        method: "GET",
        withCredentials: true
      }).then(function (result) {
        if (result.success == undefined) {
          self.menuItems = result || [];
        }
      });

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