在应用程序的Startup.cs文件中，添加以下代码：

services.AddAuthentication(options =>
{
    options.DefaultAuthenticateScheme = "Bearer";
    options.DefaultChallengeScheme = "Bearer";
})
.AddJwtBearer(options =>
{
    options.Authority = "https://{your-auth0-domain}.auth0.com/";
    options.Audience = "{your-auth0-audience}";
    options.RequireHttpsMetadata = false;
    options.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuerSigningKey = true,
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(Configuration["Auth0:ClientSecret"])),
        ValidateIssuer = true,
        ValidAudience = "{your-auth0-audience}",
        ValidateAudience = true
    };
});

注意替换{your-auth0-domain}和{your-auth0-audience}以及在appsettings.json文件或其他位置设置“Auth0：ClientSecret”指定的客户端密钥。