如果一个版本号大于另一个版本号,我的msbuild需要采取条件操作。 我试图像下面这样编码,但发现我得到一个错误(也在下面)。我哪里出错?
<?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="$(ComparisonResult) < 0">true</Setting>
</PropertyGroup>
<Message Text="Setting=$(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 (C) Microsoft Corporation. All rights reserved.
Build started 04/12/2013 15:26:38.
Project "S:\test.proj" on node 1 (default targets).
Main:
ComparisonResult=
S:\test.proj(28,16): error MSB4086: A numeric comparison was attempted on "$(ComparisonResult)" that evaluates to "" instead of a number, in conditio n "$(ComparisonResult) < 0".
Done Building Project "S:\test.proj" (default targets) -- FAILED.
Build FAILED.
"S:\test.proj" (default target) (1) ->
(Main target) ->
S:\test.proj(28,16): error MSB4086: A numeric comparison was attempted on "$(ComparisonResult)" that evaluates to "" instead of a number, in condit ion "$(ComparisonResult) < 0".
0 Warning(s)
1 Error(s)
Time Elapsed 00:00:00.09
S:\>
答案 0 :(得分:2)
好的,愚蠢。
<CompareVersions LeftHandSide="3.7" RightHandSide="3.6">
<Output ItemName="ComparisonResult" TaskParameter="Result"/>
</CompareVersions>
应该是这样的:
<CompareVersions LeftHandSide="3.7" RightHandSide="3.6">
<Output PropertyName="ComparisonResult" TaskParameter="Result"/>
</CompareVersions>
PropertyName而不是ItemName
答案 1 :(得分:0)
升级的Visual Studio为我提供了帮助。 帮助->检查更新
答案 2 :(得分:0)
更新所有NueGet软件包