Copy file before build in .net core

最新推荐文章于 2026-01-03 23:19:37 发布

原创最新推荐文章于 2026-01-03 23:19:37 发布 · 129 阅读

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本文介绍了在Visual Studio中设置构建事件以在构建C# .NET Core项目前复制appsettings.Development.json.sample文件到appsettings.Development.json。当在Azure DevOps中使用Linux构建代理时，由于COPY命令不被支持导致构建失败。解决方案是利用MSBuild的Copy任务，将相关指令添加到.csproj文件中，实现跨平台的文件复制，确保在Debug配置下正确执行。

scenario: before build a C# .net core project, copy the appsetting.development.json.sample to appsetting.development.json if the latter doesn't exist.

In Visual Studio, we can easily add a Build Event:

IF $(ConfigurationName) == Debug (
IF NOT EXIST $(ProjectDir)appsettings.Development.json copy $(ProjectDir)appsettings.Development.json.sample $(ProjectDir)appsettings.Development.json
)

but the build will fail in Azure Devops if a linux build agent is picked, because copy is not a linux command.

solution: ms build provides a copy task, which is cross-platform Copy Task - MSBuild | Microsoft Docs

for the above task, add the following to .csproj file