C# 如何在asp.net core services.AddCors中使用*关键字

我想设置

所有本地主机端口

都可以允许

CORS

，然后我尝试使用

*

关键字来实现，如下代码：

readonly string MyAllowSpecificOrigins = "_myAllowSpecificOrigins";
public void ConfigureServices(IServiceCollection services)
{
    //..
    services.AddCors(options =>
    {
        options.AddPolicy(name: MyAllowSpecificOrigins,
            builder =>
            { 
                builder.WithOrigins($"http://localhost:*");
            }
        );
    });
    //..
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    //..
    app.UseCors(MyAllowSpecificOrigins);
    //..
}

但它不起作用：

csproj：

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp3.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Dapper" Version="2.0.35" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="3.0.0" />
    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
    <PackageReference Include="System.Data.SqlClient" Version="4.8.1" />
  </ItemGroup>

</Project>

netcoreapp3.0

我想设置所有本地主机端口可以允许CORS

要达到上述要求，您可以尝试：

services.AddCors(options =>
{
    options.AddPolicy(name: MyAllowSpecificOrigins,
        builder =>
        {
            builder.SetIsOriginAllowed(origin => new Uri(origin).Host == "localhost");
        }
    );
});

---

你记得调用

iaapplicationbuilder.UseCors（）吗？

@Paul Keister是的！