1. 首先，在Dockerfile中，确保你已经使用的是ASP.NET Core SDK映像（例如：mcr.microsoft.com/dotnet/core/sdk:3.1）而非ASP.NET Core运行时映像。在这种情况下，你需要在Dockerfile中添加以下行来构建React应用程序并将生成文件复制到ASP.NET Core应用程序中：

FROM node AS build
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
RUN npm run build

FROM mcr.microsoft.com/dotnet/core/sdk:3.1
WORKDIR /app
COPY --from=build /app/build ./

ENTRYPOINT ["dotnet", "MyApp.dll"]

2. 其次，在React应用程序(src/index.js)中使用BrowserRouter而不是HashRouter，并将basename属性设置为应用程序根目录路径：

import React from 'react'
import ReactDOM from 'react-dom'
import { BrowserRouter } from 'react-router-dom'
import App from './App'

const baseUrl = document.getElementsByTagName('base')[0].getAttribute('href')
const rootElement = document.getElementById('root')

ReactDOM.render(
  
    
  ,
  rootElement
)

3. 最后，在ASP.NET Core中确保使用UseMvcWithDefaultRoute（而不是UseMvc）和MapFallbackToFile：

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseHttpsRedirection();
        app.UseHsts();
    }

    app.UseStaticFiles();
    app.UseRouting();
    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllers();
    });

    app.Use(async (context, next) =>
    {
        await next();

        if (context.Response.StatusCode == 404 && !Path.HasExtension(context.Request.Path.Value))
        {
            context.Request.Path = "/index.html";
            await next();
        }
    });

    app.UseMvcWithDefaultRoute();
    app.UseSpa(spa =>
    {