1 #region 跨域设置
 2 //注意：放到services.AddMvc()之前
 3 services.AddCors(options => {
 4                 options.AddPolicy("any",builder => {
 5 
 6                  #region 允许任何来源主机访问
 7                    builder.AllowAnyOrigin(); 
 8                  #endregion
 9 
10                   #region 允许访问的特定域
11                     //builder.WithOrigins("http://*.*.*.*")
12                     //.AllowAnyMethod()
13                     //.AllowAnyHeader()
14                     //.AllowCredentials(); 
15                    #endregion
16        });
17 });
18 #endregion

1 //跨域设置
2 app.UseMiddleware<CorsMiddleware>();

 1 /// <summary>
 2     /// CORS 中间件 【解决跨域问题】
 3     /// </summary>
 4     public class CorsMiddleware
 5     {
 6         private readonly RequestDelegate _next;
 7         public CorsMiddleware(RequestDelegate next)
 8         {
 9             _next = next;
10         }
11 
12         public async Task Invoke(HttpContext context)
13         {
14             if (!context.Response.Headers.ContainsKey("Access-Control-Allow-Origin"))
15             {
16                 context.Response.Headers.Add("Access-Control-Allow-Origin", "*");
17             }
18             await _next(context);
19         }
20     }