<Project Sdk="Microsoft.NET.Sdk.Web">
1. 复制目录下所有文件
<ItemGroup>
<Content Update="wwwroot\*">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</Content>
</ItemGroup>
2复制目录及子目录下所有文件
<ItemGroup>
<Content Update="wwwroot\**">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</Content>
</ItemGroup>