Docker环境下ASP.NET Core无法找到programminglanguage.js文件求助

问题说明 #

本地开发时，ASP.NET Core应用可正常读取programminglanguage.js文件初始化数据库，但Docker环境运行时提示文件找不到。docker compose build构建成功，但运行时抛出以下错误：

2024-09-21 04:40:15 Unhandled exception. System.IO.FileNotFoundException: Could not find file '/app/..\..\..\..\..\mock\programminglanguages\programminglanguage.js'

现有Dockerfile #

FROM mcr.microsoft.com/dotnet/sdk:8.0 as build
WORKDIR /app
EXPOSE 80

COPY TotechsThunder.sln TotechsThunder.sln
COPY mock/programminglanguages/programminglanguage.js mock/programminglanguages/programminglanguage.js
COPY src/LightningLanes/API/LightningLanes.csproj src/LightningLanes/API/LightningLanes.csproj
COPY src/LightningLanes/Core/LightningLanes.Core/LightningLanes.Core.csproj src/LightningLanes/Core/LightningLanes.Core/LightningLanes.Core.csproj
COPY src/LightningLanes/Jobs/LightningLanes.HangfireJobHost/LightningLanes.HangfireJobHost.csproj src/LightningLanes/Jobs/LightningLanes.HangfireJobHost/LightningLanes.HangfireJobHost.csproj
COPY src/Features/GitHubFeatures/Logics/Logics.csproj src/Features/GitHubFeatures/Logics/Logics.csproj
COPY src/Features/GitHubFeatures/Tests/Tests.csproj src/Features/GitHubFeatures/Tests/Tests.csproj
COPY src/Technologies/Technologies.csproj src/Technologies/Technologies.csproj
COPY src/Projects/Projects.csproj src/Projects/Projects.csproj
COPY src/Contracts/Contracts.csproj src/Contracts/Contracts.csproj
COPY src/IdentityServer/IdentityServer.csproj src/IdentityServer/IdentityServer.csproj
COPY src/Gateway/Gateway.csproj src/Gateway/Gateway.csproj

RUN dotnet restore TotechsThunder.sln

COPY src/Technologies src/Technologies
COPY src/Contracts src/Contracts
WORKDIR /app/src/Technologies
RUN dotnet publish -c Release -o /app/src/out

FROM mcr.microsoft.com/dotnet/aspnet:8.0
WORKDIR /app
COPY --from=build /app/src/out .
ENTRYPOINT [ "dotnet", "Technologies.dll" ]

文件读取代码 #

string baseDir = AppDomain.CurrentDomain.BaseDirectory;
string relativePath = @"..\..\..\..\..\mock\programminglanguages\programminglanguage.js";
string fullPath = Path.GetFullPath(Path.Combine(baseDir, relativePath));

项目结构 #

根目录下包含：

• mock文件夹：内有programminglanguages/programminglanguage.js
• src文件夹：包含Technologies等多个子项目
• 解决方案文件TotechsThunder.sln

已尝试操作 #

• 尝试检查容器内文件，但不熟悉发布版Docker环境的文件系统，未完成排查

期望结果 #

• programminglanguage.js能被正确复制到容器内
• 现有相对路径代码无需修改即可找到文件

解决方案：保持容器内目录结构与本地一致 #

问题核心是Docker最终镜像的目录结构与本地开发环境不一致，导致相对路径解析失败。修改Dockerfile，让容器内的目录结构和本地匹配：

FROM mcr.microsoft.com/dotnet/sdk:8.0 as build
WORKDIR /app
EXPOSE 80

# 复制整个项目结构（替代单个文件/项目文件的复制，更简洁）
COPY TotechsThunder.sln TotechsThunder.sln
COPY mock/ mock/
COPY src/ src/

RUN dotnet restore TotechsThunder.sln

WORKDIR /app/src/Technologies
# 发布到和本地一致的目录结构
RUN dotnet publish -c Release -o ./bin/Release/net8.0/publish

FROM mcr.microsoft.com/dotnet/aspnet:8.0
WORKDIR /app
# 复制mock文件夹和发布后的文件，保持本地目录结构
COPY --from=build /app/mock/ mock/
COPY --from=build /app/src/Technologies/bin/Release/net8.0/publish src/Technologies/bin/Release/net8.0/publish

# 切换到和本地一致的发布目录作为工作目录
WORKDIR /app/src/Technologies/bin/Release/net8.0/publish
ENTRYPOINT [ "dotnet", "Technologies.dll" ]

验证容器内文件的方法 #

如果需要确认文件是否存在，可运行以下命令进入容器查看：

# 替换为你的镜像名称或容器ID
docker run -it --entrypoint bash your-image-name
# 查看目录结构
ls -R /app

内容的提问来源于stack exchange，提问作者strypperjason115