項目中經常會遇到跨域問題，解決方法：

在appsettings.json? 文件中添加json項

{"Logging": {"LogLevel": {"Default": "Warning"}},"AllowedHosts": "*","AppCores": "https://www.xxx0.com,https://www.xxx1.com" }

在Startup文件中進行設置

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; using SignalRTestCore.SignalR;namespace SignalRTestCore {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;}); var urls = Configuration["AppCores"].Split(',');services.AddCors(options => options.AddPolicy("AllowAll",policy => policy.WithOrigins(urls).AllowAnyMethod().AllowAnyHeader().AllowCredentials()));services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);}// 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");// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.app.UseHsts();}app.UseHttpsRedirection();app.UseStaticFiles();app.UseCookiePolicy();app.UseCors("AllowAll");app.UseMvc();}} }

　　

在Controller類上進行跨域設置???[EnableCors("AllowAll")]

?

轉載于:https://www.cnblogs.com/zengxia/p/11143601.html

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