如何在MSBuild ItemGroups的"循环"中执行EXEC任务？

Question

如何在MSBuild ItemGroups的"循环"中执行EXEC任务？

而不是一遍又一遍地重复这个命令,如下:

    <Exec ContinueOnError="false" Command="sqlcmd -S $(ServerName) $(SqlServerUser) -d $(DbName) -v TableName=%22account%22 -i data\add_sql_cache.sql -b" />
    <Exec ContinueOnError="false" Command="sqlcmd -S $(ServerName) $(SqlServerUser) -d $(DbName) -v TableName=%22services%22 -i data\add_sql_cache.sql -b" />
    <Exec ContinueOnError="false" Command="sqlcmd -S $(ServerName) $(SqlServerUser) -d $(DbName) -v TableName=%22servicesGroup%22 -i data\add_sql_cache.sql -b" />
    <Exec ContinueOnError="false" Command="sqlcmd -S $(ServerName) $(SqlServerUser) -d $(DbName) -v TableName=%22servicesCategory%22 -i data\add_sql_cache.sql -b" />

我宁愿定义一个ItemGroup而只是执行一个"循环".我把ItemGroup放下了:

<ItemGroup>
    <CachedTables Include="account" />
    <CachedTables Include="services" />
    <CachedTables Include="servicesGroup" />
    <CachedTables Include="servicesCategory" />

但是由于MSBuild的语法非常不直观,我不知道如何在上面的ItemGroup作为输入的循环中执行Exec任务.

Answer 1

有两种方法可以做到这一点,都是"批处理"的形式

您可以批量处理目标并执行Exec和其他操作,

<Target Name="ExecMany"
  Outputs="%(CachedTables.Identity)">
  <Exec
    Command="sqlcmd -S ... TableName=%22%(CachedTables.Identity)%22 -i ..."
    />
  <SomeOtherTask ThatUses="%(CachedTables.Identity)" />
</Target>

另一种是在Exec任务上使用任务批处理.它很相似,

<Target Name="ExecMany">
  <Exec
    Command="sqlcmd -S ... TableName=%22%(CachedTables.Identity)%22 -i ..."
    />
  <SomeOtherTask ThatUses="%(CachedTables.Identity)" />
</Target>

不同之处在于它们的运作方式.对于第一个,因为批处理是针对整个目标(使用Outputs属性实现),Exec任务,然后SomeOtherTask将对组中的每个项执行.换一种说法,

Exec with "account"
SomeOtherTask with "account"
Exec with "services"
SomeOtherTask with "services"
...

第二个选项,分别批处理每个任务,将产生以下顺序,

Exec with "account"
Exec with "services"
...
SomeOtherTask with "account"
SomeOtherTask with "services"
...

Answer 2

如果我理解这个问题,可以更简单地完成.以下示例使用<Exec />回显<ItemGroup />中的每个项目

  <ItemGroup>
    <MySpecialItem Include="one" />
    <MySpecialItem Include="two" />
    <MySpecialItem Include="three" />
  </ItemGroup>    

  <Target Name="MyTarget">
    <Exec Command="echo %(MySpecialItem.Identity)"/>
  </Target>