MSBuild ReadLinesFromFile 一行中的所有文本

问题描述

当我对 MSBUILD 中的文件执行 ReadLinesFromFile 并再次输出该文件时，我将所有文本放在一行上.所有的回车和 LineFeed 都被去掉了.

我从通常看起来像这样的文件中获取文本

- BLAH 的新部署工具- 随机其他东西()"

这样出来

- BLAH 的新部署工具；- 随机其他东西()""

我知道 ReadLinesFromFile 的代码会一次提取一行数据并去掉回车.

有没有办法把它们放回去?所以我的电子邮件看起来格式都很好?

谢谢

解决方案

这里的问题是您以非预期的方式使用 ReadLinesFromFile 任务.

ReadLinesFromFile 任务
从文本文件中读取 items 列表.

所以它不只是从文件中读取所有文本，而是从文件中读取单个项目并返回 ITaskItem 的项目组.每当您使用 @() 语法输出项目列表时，您将获得一个分隔列表，默认为分号.这个例子说明了这种行为:

<?xml version="1.0" encoding="utf-8"?><Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5"><项目组><颜色包括=红色"/><颜色包括=蓝色"/><颜色包括=绿色"/></项目组><目标名称="构建"><Message Text="ItemGroup 颜色:@(Color)"/></目标></项目>

输出如下所示:

 ItemGroup 颜色:Red;Blue;Green

因此，虽然解决问题的最佳方法是编写一个 MSBuild 任务，将文件作为字符串而不是项目列表读取到 property 中，但这确实不是您所要求的.您问是否有方式可以将它们放回去，并且正在使用 MSBuild 转换.

转换用于从另一个列表创建一个列表，并且还可以使用自定义分隔符进行转换.因此，答案是将使用 ReadItemsFromFile 读取的列表转换为另一个带有换行符的列表.下面是一个例子:

<?xml version="1.0" encoding="utf-8"?><Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5"><项目组><文件包含="$(MSBuildProjectDirectory)Test.txt"/></项目组><目标名称="构建"><ReadLinesFromFile File="@(File)"><输出TaskParameter="Lines" ItemName="FileContents"/></ReadLinesFromFile><Message Text="FileContents:@(FileContents)"/><Message Text="文件内容已转换:@(FileContents->'%(Identity)', '%0a%0d')"/></目标></项目>

Test.text 看起来像:

红色绿蓝色

输出如下所示:

[C:	emp]:: msbuild test.projMicrosoft (R) Build Engine 版本 3.5.21022.8[Microsoft .NET 框架，版本 2.0.50727.1433]版权所有 (C) Microsoft Corporation 2007.保留所有权利.构建开始于 2008 年 11 月 8 日上午 8:16:59.节点 0 上的项目C:	emp	est.proj"(默认目标).文件内容:红色；绿色；蓝色转换后的文件内容:红色绿蓝色完成构建项目C:	emp	est.proj"(默认目标).构建成功.0 个警告0 错误经过时间 00:00:00.03

这里发生了两件事.

@(FileContents->'%(Identity)', '%0a%0d')

• 我们使用相同的值 (Identity) 将列表从一种类型转换为另一种类型，但使用自定义分隔符 '%0a%0d'
• 我们正在使用 MSBuild Escaping 来转义换行符(%0a) 和回车 (%0d)

When I do a ReadLinesFromFile on a file in MSBUILD and go to output that file again, I get all the text on one line. All the Carriage returns and LineFeeds are stripped out.

<Project DefaultTargets = "Deploy"
xmlns="http://schemas.microsoft.com/developer/msbuild/2003" >
<Import  Project="$(MSBuildExtensionsPath)MSBuildCommunityTasksMSBuild.Community.Tasks.Targets"/>

<ItemGroup>
    <MyTextFile Include="$(ReleaseNotesDir)$(NewBuildNumber).txt"/>
</ItemGroup>

<Target Name="ReadReleaseNotes">
    <ReadLinesFromFile
        File="@(MyTextFile)" >
        <Output
            TaskParameter="Lines"
            ItemName="ReleaseNoteItems"/>
    </ReadLinesFromFile>
</Target>

<Target Name="MailUsers" DependsOnTargets="ReadReleaseNotes" >
    <Mail SmtpServer="$(MailServer)"
        To="$(MyEMail)"
        From="$(MyEMail)"
        Subject="Test Mail Task"
        Body="@(ReleaseNoteItems)" />
</Target>
<Target Name="Deploy">
    <CallTarget Targets="MailUsers" />
</Target>

</Project>

I get the text from the file which normally looks like this

Coming out like this

I know that the code for ReadLinesFromFile will pull the data in one line at a time and strip out the carriage returns.

Is there a way to put them back in?So my e-mail looks all nicely formatted?

Thanks

解决方案

The problem here is you are using the ReadLinesFromFile task in a manner it wasn't intended.

So it's not just reading all the text from a file, it's reading individual items from a file and returning an item group of ITaskItems. Whenever you output a list of items using the @() syntax you will get a separated list, the default of which is a semicolon. This example illustrates this behavior:

<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build"    xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5">

    <ItemGroup>
        <Color Include="Red" />
        <Color Include="Blue" />
        <Color Include="Green" />
</ItemGroup>

<Target Name="Build">
        <Message Text="ItemGroup Color: @(Color)" />
</Target>

</Project>

And the output looks like this:

  ItemGroup Color: Red;Blue;Green

So while the best solution to your problem is to write an MSBuild task that reads a file into a property as a string an not a list of items, that's really not what you asked for. You asked if there was a way to put them back, and there is using MSBuild Transforms.

Transforms are used to create one list from another and also have the ability to transform using a custom separator. So the answer is to transform your list read in using ReadItemsFromFile into another list with newlines. Here is an example that does just that:

<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5">

    <ItemGroup>
        <File Include="$(MSBuildProjectDirectory)Test.txt" />
    </ItemGroup>

    <Target Name="Build">
        <ReadLinesFromFile File="@(File)">
            <Output TaskParameter="Lines" ItemName="FileContents" />
        </ReadLinesFromFile>

        <Message Text="FileContents: @(FileContents)" />
        <Message Text="FileContents Transformed: @(FileContents->'%(Identity)', '%0a%0d')" />
    </Target>

</Project>

Test.text looks like:

Red
Green
Blue

And the output looks like this:

[C:	emp]:: msbuild test.proj
Microsoft (R) Build Engine Version 3.5.21022.8
[Microsoft .NET Framework, Version 2.0.50727.1433]
Copyright (C) Microsoft Corporation 2007. All rights reserved.

Build started 11/8/2008 8:16:59 AM.
Project "C:	emp	est.proj" on node 0 (default targets).
  FileContents: Red;Green;Blue
  FileContents Transformed: Red
Green
Blue
Done Building Project "C:	emp	est.proj" (default targets).


Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:00:00.03

What's going on here is two things.

@(FileContents->'%(Identity)', '%0a%0d')

• We are transforming the list from one type to another using the same values (Identity) but a custom separator '%0a%0d'
• We are using MSBuild Escaping to escape the line feed (%0a) and carriage return (%0d)

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