MSBuild BuildInParallel，运行失败的自定义任务产卵过程

Question

我使用MSBuild任务的BuildInParallel属性并行地运行构建项目。根项目正在建设四个儿童项目。子项目正在使用自定义的MSBuild任务，该任务使用System.Diagnostics.Process启动新的进程。出于某种原因，当UseShellExecute为false时，派生进程无法正常运行。我不知道这是为什么，我也弄不清是什么错误 - 所发生的一切是Process.ExitCode是1，也不例外..

这里的自定义MSBuild任务：

using System; 
using Microsoft.Build.Utilities; 
using System.Diagnostics; 

public class MSBuildProcessTask : Task 
{ 
    public string Executable { get; set; } 
    public string Arguments { get; set; } 

    public override bool Execute() 
    { 
     using (var p = new Process()) 
     { 
      try 
      { 
       p.StartInfo = new ProcessStartInfo(Executable, Arguments) 
           { 
            UseShellExecute = false, 
            //RedirectStandardOutput = true 
           }; 
       //p.OutputDataReceived += (o, e) => 
       //{ 
       // if (e.Data != null) 
       // { 
       //  Log.LogMessage(MessageImportance.Normal, e.Data); 
       // } 
       //}; 
       p.Start(); 
       //p.BeginOutputReadLine(); 
       p.WaitForExit(); 
      } 
      catch (Exception e) 
      { 
       throw; // for setting breakpoint 
      } 
      finally 
      { 
       if (p.ExitCode != 0) 
       { 
        Log.LogError("Error. Exit code: " + p.ExitCode); 
       } 
       p.Close(); 
      } 
     } 
     return true; 
    } 
} 

而这里的根MSBuild项目文件（Test.proj，其实我只是在建设两个子项目在这里，但仍然得到错误..）：

<?xml version="1.0" encoding="utf-8" ?> 
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> 
    <UsingTask TaskName="MSBuildProcessTask" AssemblyFile="C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\bin\Debug\MSBuildProcessTask.dll" /> 
    <Target Name="Default"> 
     <ItemGroup> 
      <ProjectFiles Include="$(MSBuildProjectDirectory)\Test.1.proj" /> 
      <ProjectFiles Include="$(MSBuildProjectDirectory)\Test.2.proj" /> 
      <!--<ProjectFiles Include="$(MSBuildProjectDirectory)\Test.3.proj" /> 
      <ProjectFiles Include="$(MSBuildProjectDirectory)\Test.4.proj" />--> 
     </ItemGroup> 
      <MSBuild BuildInParallel="true" Projects="@(ProjectFiles)" /> 
    </Target> 
</Project> 

而这里的孩子项目文件的例子（ Test.1.proj）：

<?xml version="1.0" encoding="utf-8" ?> 
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> 
    <UsingTask TaskName="MSBuildProcessTask" AssemblyFile="C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\bin\Debug\MSBuildProcessTask.dll" /> 
    <Target Name="Default"> 
     <Message Text="Hello" /> 
     <MSBuildProcessTask Executable="sqlcmd" Arguments="-S .\SQLEXPRESS -Q &quot;SELECT @@VERSION&quot;" /> 
    </Target> 
</Project> 

我的命令行是：C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe /m /nr:false C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj

下面是一个示例输出：

C:\Users\Tom>C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe /m /nr:false C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildPr 
ocessTask\Test.proj 
Microsoft (R) Build Engine Version 4.0.30319.1 
[Microsoft .NET Framework, Version 4.0.30319.235] 
Copyright (C) Microsoft Corporation 2007. All rights reserved. 

Build started 16/08/2011 22:22:06. 
    1>Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj" on node 1 (default targets). 
    1>Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj" (1) is building "C:\Users\Tom\Sandbox\reposito 
     ry_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.1.proj" (2) on node 1 (default targets). 
    2>Default: 
     Hello 
    1>Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj" (1) is building "C:\Users\Tom\Sandbox\reposito 
     ry_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.2.proj" (3) on node 2 (default targets). 



------------------------------------------------------------------------------------------------------------------------------------------------------ 
------------------------------------------------------------------------------------------------------------------------------------------------------ 

Microsoft SQL Server 2008 (SP1) - 10.0.2531.0 (X64) 
     Mar 29 2009 10:11:52 
     Copyright (c) 1988-2008 Microsoft Corporation 
     Express Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1) 


(1 rows affected) 
    3>Default: 
     Hello 
    2>Done Building Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.1.proj" (default targets). 
    3>C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.2.proj(6,3): error : Error. Exit code: 1 
    3>Done Building Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.2.proj" (default targets). 
    1>Done Building Project "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj" (default targets). 

Build succeeded. 

     "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.proj" (default target) (1) -> 
     "C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.2.proj" (default target) (3) -> 
     (Default target) -> 
     C:\Users\Tom\Sandbox\repository_trunk\MSBuildProcessTask\MSBuildProcessTask\Test.2.proj(6,3): error : Error. Exit code: 1 

    0 Warning(s) 
    1 Error(s) 

Time Elapsed 00:00:00.23 

C:\Users\Tom> 

正如你所看到的，我们只能从SQLCMD命令之一获取输出。

Answer 1

没有机会说出究竟导致问题的原因，您必须亲自调查或至少提供有关错误的更多详细信息。

试试运行MSBuild指定诊断详细级别，将倾倒在非常详细的输出，同时运行：

MsBuild.exe /v:diag 

Answer 2

你有没有尝试给每个目标唯一的名称（不是“默认”）？

我认为，当你包含一个项目时，msbuild将包含的项目的目标扩展到当前项目中。当您添加与现有名称相同名称的另一个目标时，现有名称将被覆盖。

您可以使用here中所述的/ preprocess开关查看扩展项目的外观。