<PackageReference Update="Microsoft.NETCore.App" Version="2.1.22" />
    <PackageReference Include="Platform.Core" Version="1.8.0" />

What is the difference between "Update" and "Include" in the above two lines?

CodePudding user response：

See these docs.

It looks like Update is used when you want to modify only some properties on a pre-existing item with the same name

So you could do:

<PackageReference Include="Some.Package" Version="1.2.3"/>
<PackageReference Update="Some.Package" PrivateAssets="all"/>

The Update line would add the PrivateAssets="all" property to the pre-existing Some.Package item, with the end result being the same as:

<PackageReference Include="Some.Package" Version="1.2.3" PrivateAssets="all"/>

If you had used Include instead of Update, you'd have overwritten the first line entirely, and lost the Version="1.2.3" property.

Note that just using Update when there isn't a pre-existing item to update seems to be harmless, but is pointless.