How do you format text in MSBuild?

Specifically, I am looking to zero pad a number to creat开发者_如何学Pythone a string based label. i.e. build 7 into build 007. You can easily add strings together, but in all my searches on formatting, padding, strings, etc... I have not been able to find any references.

Example of what I am working with.

<PropertyGroup>
  <FileParserVersion>File Parser $(Major).$(Minor).$(Build) Build $(Revision)</FileParserVersion>
  <VersionComment>Automated build: $(FileParserVersion)</VersionComment>
</PropertyGroup>

This is generated: FILEPARSER_1_0_3_BUILD_7

What is preferred: FILEPARSER_1_0_3_BUILD_007

In 4.0+ you can do it in one line with Property Functions (and on MSDN)

$([System.String]::Format('FILEPARSER_$(Major)_$(Minor)_$(Build)_BUILD_{0:000}', $([MSBuild]::Add($(Revision), 0))))

Unfortunately the bogus "Add" is necessary to trick MSBuild to coerce $(Revision) to a number before it coerces it into the object expected by String.Format. If I don't do that it uses a string, and the padding doesn't work. The coercion inside MSBuild could be a bit smarter here.

Consider the following ITask:

using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;

namespace My.MSBuild.Tasks
{
    public class FormatRevision : Task
    {
        #region Public Properties

        [Required]
        public int Revision { get; set; }

        [Required]
        public string MajorVersion { get; set; }

        [Output]
        public string OutputVersion { get; private set; }

        #endregion

        #region ITask Methods

        public override bool Execute()
        {
            OutputVersion = string.Format("{0}.{1}"
                , MajorVersion
                , Revision < 10 ?
                    "00" + Revision : Revision < 100 ?
                        "0" + Revision : Revision.ToString());

            Log.LogMessage("Revision: {0} -> Output Version: {1}"
                 , Revision, OutputVersion);

            return true;
        }

        #endregion
    }
}

MSBuild target (formatvesion.proj):

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

 <Target Name="FormatRevision"> 
    <FormatRevision MajorVersion="$(MajorVersion)" Revision="$(Revision)">
        <Output TaskParameter="OutputVersion" PropertyName="FormattedVersion"/>
     </FormatRevision>
  </Target>

 <UsingTask TaskName="My.MSBuild.Tasks.FormatRevision" AssemblyFile="My.MSBuild.Tasks.dll" /> 

 </Project>

Invoked by command:

msbuild formatvesion.proj /t:FormatRevision /p:MajorVersion=1.0;Revision=7

Alternatively, if you wish to use CreateProperty:

<PropertyGroup>
  <FileParserVersion>File Parser $(Major).$(Minor).$(Build) Build $(Revision)</FileParserVersion>
  <VersionComment>Automated build: $(FileParserVersion)</VersionComment>
</PropertyGroup>

<PropertyGroup>
  <PaddedRevision Condition="$(Revision) &lt; 1000">$(Revision)</PaddedRevision> 
  <PaddedRevision Condition="$(Revision) &lt; 100">0$(Revision)</PaddedRevision>  
  <PaddedRevision Condition="$(Revision) &lt; 10">00$(Revision)</PaddedRevision>
</PropertyGroup>

<Target Name="test"> 

    <CreateProperty 
        Value="FILEPARSER_$(Major)_$(Minor)_$(Build)_BUILD_$(PaddedRevision)">
        <Output TaskParameter="Value" PropertyName="MyFileVersion" />
    </CreateProperty>
    <Message Text="$(VersionComment) -> $(MyFileVersion)" />

</Target>