add 直接替换index.html，不使用新的类库。

samples/SwaggerUI_IndexStream_Knife4jUI_Demo/Startup.cs

@@ -0,0 +1,104 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Reflection;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.FileProviders;
+using Microsoft.Extensions.Hosting;
+using Microsoft.OpenApi.Models;
+using Swashbuckle.AspNetCore.SwaggerGen;
+using Swashbuckle.AspNetCore.SwaggerUI;
+
+namespace Knife4jUIDemo
+{
+    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.AddControllers();
+            services.AddSwaggerGen(c =>
+            {
+                c.SwaggerDoc("v1", new OpenApiInfo { Title = "API V1", Version = "v1" });
+                c.AddServer(new OpenApiServer()
+                {
+                    Url = "",
+                    Description = "vvv"
+                });
+                c.CustomOperationIds(apiDesc =>
+                {
+                    return apiDesc.TryGetMethodInfo(out MethodInfo methodInfo) ? methodInfo.Name : null;
+                });
+            });
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+
+            app.UseHttpsRedirection();
+
+            app.UseRouting();
+            app.UseStaticFiles();
+
+            app.UseAuthorization();
+
+            app.UseSwagger();
+
+            app.UseSwaggerUI(c =>
+            {
+                c.RoutePrefix = ""; // serve the UI at root
+                c.SwaggerEndpoint("/v1/api-docs", "V1 Docs");//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD><D0A7>
+                c.IndexStream = () => new PhysicalFileProvider(Path.Combine(Directory.GetCurrentDirectory(), "wwwroot")).GetFileInfo("index.html").CreateReadStream();
+            });
+
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapControllers();
+                endpoints.MapSwagger("{documentName}/api-docs");
+                endpoints.MapGet("/v3/api-docs/swagger-config", async (httpContext) =>
+                {
+
+                    JsonSerializerOptions _jsonSerializerOptions = new JsonSerializerOptions();
+                    _jsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
+                    _jsonSerializerOptions.IgnoreNullValues = true;
+                    _jsonSerializerOptions.Converters.Add(new JsonStringEnumConverter(JsonNamingPolicy.CamelCase, false));
+
+                    SwaggerUIOptions _options = new SwaggerUIOptions()
+                    {
+                        ConfigObject = new ConfigObject()
+                        {
+                            Urls = new List<UrlDescriptor>
+                            {
+                                new UrlDescriptor()
+                                {
+                                    Url="/v1/api-docs",
+                                    Name="V1 Docs"
+                                }
+                            }
+                        }
+                    };
+
+                    await httpContext.Response.WriteAsync(JsonSerializer.Serialize(_options.ConfigObject, _jsonSerializerOptions));
+                });
+            });
+        }
+    }
+}