MSbuild Copy whole folder

If you put the folder in the root of your c# project then you can simple put this in your csproj.

<ItemGroup>
    <None Update="FolderToCopy\**\*.*">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
</ItemGroup>

I have only tested in the 2017 version of csproj, but I assume it's backwards compatible. Could be wrong on that though

Copying files can be done with the following code snippet which handles antivirus programs and subdirectories

  <ItemGroup>
        <SomeAppStuff Include="$(SolutionDir)\ProjectXXX\bins\**\*.*" />
  </ItemGroup>
  <Copy 
      SourceFiles="@(SomeAppStaff)" 
      DestinationFolder="$(OutputPath)\%(RecursiveDir)" 
      SkipUnchangedFiles="true"
      OverwriteReadOnlyFiles="true" 
      Retries="3"
      RetryDelayMilliseconds="300"/>

Specifying $(OutputPath)\%(RecursiveDir) will ask Copy task to respect subfolders, so it will place subfolders of source directory to subfolders of target directories.

SkipUnchangedFiles will increase build speed on computers with enough memory, because Windows optimizes IO for frequently used files when there's enough RAM.

Retries and RetryDelayMilliseconds handles issues related a) Compressed NTFS file system, when builds fails in seldom cases b) Antivirus Software with SSD drives.

Specify your ItemGroup for SourceFiles explicitly.

<ItemGroup>
    <_CopyItems Include="$(TargetDir)\*.*" />
</ItemGroup>
<Copy
    SourceFiles="@(_CopyItems)"
    DestinationFolder="$(BuildOutput)\SomeDir"
    />

Note that _CopyItems is an item type, so it's referenced using '@' symbol rather than '$'.