Swagger自定义默认首页

 app.UseSwaggerUI(option =>
            { 
　　　　　　　　option.IndexStream = (Func<Stream>) (() => Assembly.GetExecutingAssembly()
　　　　　　　　.GetManifestResourceStream("GreenUnity.GuangMing.WebApi.wwwroot.html.index.html"));
            });

Stream _stream=  (Func<Stream>) (() => typeof (SwaggerUIOptions).GetTypeInfo().Assembly.GetManifestResourceStream("Swashbuckle.AspNetCore.SwaggerUI.index.html"));
byte[] _byte=new byte[_stream.Length];
_stream.Read(_byte,0,_byte.Length);
string _html=Encoding.UTF8.GetString(_byte);