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Editorial Team
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Asked: 2026-05-28T15:52:11+00:00

I have the following string called MasterVersion : 1.1-SNAPSHOT I need to split it

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I have the following string called MasterVersion:

1.1-SNAPSHOT

I need to split it by the . and the – so it becomes a string[] array called SplitVersion, i.e.:

1
1
SNAPSHOT

I’ve tried everything I can think of including about a dozen variations of the below, with no joy:

<!-- doesn't work -->
<ItemGroup>
    <VersionDelimiters Include="." />
    <VersionDelimiters Include="-" />
    <SplitVersion Include="$(MasterVersion.Split(@VersionDelimiters))" />
</ItemGroup>

<!-- doesn't work either -->
<ItemGroup>
    <SplitVersion Include="$(MasterVersion.Split([`.`; `-`]))" />
</ItemGroup>

What obscure MSBuild syntax am I missing/mucking up?

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1 Answer

  1. Editorial Team

    MSBuild 4.0 property functions cannot handle arrays (well basically), however when you do a

    Split(`,`, `-`)

    You are invoking the String.Split(params string[]) overload, which requires an array (even in C# the params keyword will create an array behind the scene and do something like Split(new string[] { ',', '-' }) internally).

    What you could do is the following:

    <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"
 ToolsVersion="4.0">

    <PropertyGroup>
        <MasterVersion>1.1-SNAPSHOT</MasterVersion>
    </PropertyGroup>

    <ItemGroup>
        <SplitVersion Include="$(MasterVersion.Replace(`-`, `.`).Split(`.`))" />
    </ItemGroup>

    <Target Name="Test">
        <Message Importance="high" Text="@(SplitVersion)"/>
    </Target>
</Project>

    Or you could first create the (string) array to be passed to Split:

    <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">
    <PropertyGroup>
        <MasterVersion>1.1-SNAPSHOT</MasterVersion>
        <Delimiters>.;-</Delimiters>
        <DelimitersArray>$(Delimiters.Split(`;`))</DelimitersArray>
    </PropertyGroup>
    <ItemGroup>
        <SplitVersion Include="$(MasterVersion.Split($(DelimitersArray)))" />
    </ItemGroup>
    <Target Name="Test">
        <Message Importance="high" Text="@(SplitVersion)"/>
    </Target>
</Project>

    Which is not really better in this case 😉

    Oh, and you might want to check out this MSDN blog entry for more useful information.

    Update for a comment:

    • The “content” of SplitVersion is technically an “array of ITaskItem”, yes.
      You would deal with it however you would deal with Items (of ItemGroups);
      including things like “batching”, etc.

    • You cannot really “access things by index” in msbuild project files. Expressions like
      $(SplitVersion)[0] or @(SplitVersion)[0] or @(SplitVersion[0]) don’t
      do what you’d think/like. If you really would to you could assign individual
      properties for “array elements” by “index”.

    Example:

    <PropertyGroup>
  <SplitVersion0>$(MasterVersion.Split($(DelimitersArray))[0])</SplitVersion0>
  <SplitVersion1>$(MasterVersion.Split($(DelimitersArray))[1])</SplitVersion1>
  <SplitVersion2>$(MasterVersion.Split($(DelimitersArray))[2])</SplitVersion2>
</PropertyGroup>

    The array-indexing operator works here, because in this case you are still “in the context” of the .NET expression. Once that is assigned to a property (or item group) you cannot do that anymore.

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