netcore多语言使用命令行编译中文包出不来的问题解决

多语言功能比较常见。.netcore里，我们一般都会使用资源包，也就是在Resources目录下创建语言包。

第二步：startup里写代码：

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.OpenApi.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace WebApplication4
{
    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.AddLocalization(options => options.ResourcesPath = "Resources");
            services.AddControllers();
            services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new OpenApiInfo { Title = "WebApplication4", Version = "v1" });
            });
             
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {

            var supportedCultures = new[] { "zh-CN","en-US" };
            var localizationOptions = new RequestLocalizationOptions().SetDefaultCulture(supportedCultures[0])
                .AddSupportedCultures(supportedCultures)
                .AddSupportedUICultures(supportedCultures);

            app.UseRequestLocalization(localizationOptions);

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseSwagger();
                app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "WebApplication4 v1"));
            }

            app.UseRouting();

            app.UseAuthorization();

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

在VS2022里 F5运行没任何问题。但是若使用在Docker里编译+运行，就出现问题了，中文一直无法出来。

我们在Docker里 使用 dotnet build来编译的，完整的Dockerfile如下：

#See https://aka.ms/containerfastmode to understand how Visual Studio uses this Dockerfile to build your images for faster debugging.

FROM mcr.microsoft.com/dotnet/aspnet:5.0 AS base
WORKDIR /app
EXPOSE 80

FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
WORKDIR /src
COPY ["WebApplication4/WebApplication4.csproj", "WebApplication4/"]
RUN dotnet restore "WebApplication4/WebApplication4.csproj"
COPY . .
WORKDIR "/src/WebApplication4"
RUN dotnet build "WebApplication4.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "WebApplication4.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "WebApplication4.dll"]

各种疑点排查，发现dotnet build竟然无法生成 zh-CN  。这个就是问题所在。

那么如何解决呢？根据官方文档，发现标准里竟然没有 zh-CN   。

中文只有  zh-Hans和 zh-Hant，以及父类  zh     。

知道这个就可以了，我们将资源包 Lang.zh-CN改名为   Lang.zh就可以了。当然也可改为  Lang.zh-Hans  。

官方文档如下：

https://docs.microsoft.com/zh-cn/aspnet/core/fundamentals/localization?view=aspnetcore-5.0

https://docs.microsoft.com/zh-cn/dotnet/api/system.globalization.cultureinfo?view=net-6.0