相关疑难解决方法(0)

如果一个版本号大于另一个版本号，我的 msbuild 需要采取有条件的操作。我试过像下面这样编码，但发现我收到一个错误（也在下面）。我哪里错了？

<?xml version="1.0" encoding="utf-8"?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"
     DefaultTargets="Main"
     ToolsVersion="4.0">

  <UsingTask TaskName="CompareVersions" TaskFactory="CodeTaskFactory"     AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
    <ParameterGroup>
      <LeftHandSide Required="true"/>
      <RightHandSide Required="true"/>
      <Result ParameterType="System.Int32" Output="true"/>
    </ParameterGroup>
    <Task>
      <Code Type="Fragment" Language="cs">
        Version a = Version.Parse( LeftHandSide );
        Version b = Version.Parse( RightHandSide );
        Result = a.CompareTo(b);
      </Code>
    </Task>
  </UsingTask>

   <Target Name="Main">
    <CompareVersions LeftHandSide="3.7" RightHandSide="3.6">
      <Output ItemName="ComparisonResult" TaskParameter="Result"/>
    </CompareVersions>
    <Message Text="ComparisonResult=$(ComparisonResult)"></Message>
    <PropertyGroup>
      <Setting Condition="$(ComparisonResult) &lt; 0">true</Setting>
    </PropertyGroup>
    <Message Text="Setting=$(Setting)"></Message>
   </Target>

</Project>

S:\>msbuild test.proj Microsoft (R) Build Engine version
4.0.30319.18408 [Microsoft .NET Framework, version 4.0.30319.18408] Copyright …