我正在使用MSBuild任务的BuildInParallel属性来同时运行构建项目。根项目正在构建四个子项目。子项目正在使用自定义的MSBuild任务，该任务使用System.Diagnostics.Process启动一个新进程。由于UseShellExecute为false时，生成的进程无法正确运行，但我不知道原因是什么，也无法找出错误在哪里——只有Process.ExitCode为1，没有异常。
以下是自定义的MSBuild任务：
以下是子项目文件（Test.1.proj）的示例：
以下是自定义的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;
}
}
这是根 MSBuild 项目文件（实际上我只在这里构建了两个子项目，但仍然出现错误..）：
<?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>
以下是子项目文件（Test.1.proj）的示例：
<?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 "SELECT @@VERSION"" />
</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
以下是示例输出：
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>
正如您所看到的，我们只从一个SQLCMD命令中获取输出。