在MSBuild中构建字符串作为n次基本字符串的连接 [英] Build a string in MSBuild as a concatenation of a base string n-times

问题描述

我在MSBuild的属性中有一个数字"n".我也有一个字符串"Str"，需要重复n次才能获得最终的字符串，该字符串是"Str"的n次重复.

I have a numer, "n" in a property in MSBuild. I also have a string "Str" that needs to be duplicated n-times to achieve a final string that is the repetition of "Str" n times.

例如.如果n为3，且Str为"abc"，我想获取的是"abcabcabc"

Eg. If n is 3 and Str is "abc", what I want to obtain is "abcabcabc"

由于无法在MSBuild中循环，所以我不知道该如何实现.也许有一个项目组，但是如何基于包含"n"个计数的属性创建一个项目?

Since one cannot loop in MSBuild, I don't know how to achieve this. Perhaps with an item group, but how do I create one based on a property containing an "n" count?

谢谢！

推荐答案

通常，对于此类问题，我决定使用内联C#，因为与在Internet上查找真正的" msbuild解决方案相比，它花费的时间更少.你去了:

usually for things like this I resolve to using inline C#, as it costs me less time than searching all over the internet to find a 'true' msbuild solution; here you go:

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

  <PropertyGroup>
    <MyString>abc</MyString>
    <Count>3</Count>
  </PropertyGroup>

  <UsingTask TaskName="RepeatString" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
    <ParameterGroup>
      <s ParameterType="System.String" Required="true" />
      <n ParameterType="System.Int32" Required="true" />
      <result ParameterType="System.String" Output="true" />
    </ParameterGroup>
    <Task>
      <Code Type="Fragment" Language="cs"><![CDATA[
        result = string.Concat( Enumerable.Repeat( s, n ) );
        ]]></Code>
    </Task>
  </UsingTask>

  <Target Name="doit">
    <RepeatString s="$(MyString)" n="$(Count)">
      <Output PropertyName="result" TaskParameter="result" />
    </RepeatString>
    <Message Text="Result = $(result)"/>
  </Target>

</Project>

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