MSBuild getting property substring before underscore symbol

In MSBuild I have a property which value is Name_Something. How can I get name part of this prop开发者_StackOverflow中文版erty.

With MSBuild 4

If you use MSBuild 4, you could use the new and shiny property functions.

<PropertyGroup>
  <MyProperty>Name_Something</MyProperty>
</PropertyGroup>

<Target Name="SubString">
  <PropertyGroup>
    <PropertyName>$(MyProperty.Substring(0, $(MyProperty.IndexOf('_'))))</PropertyName>
  </PropertyGroup>

  <Message Text="PropertyName: $(PropertyName)"/>
</Target>

With MSBuild < 4

You could use the RegexReplace task of MSBuild Community Task

<PropertyGroup>
  <MyProperty>Name_Something</MyProperty>
</PropertyGroup>

<Target Name="RegexReplace">
  <RegexReplace Input="$(MyProperty)" Expression="_.*" Replacement="" Count="1">
    <Output ItemName ="PropertyNameRegex" TaskParameter="Output" />
  </RegexReplace>

  <Message Text="PropertyNameRegex: @(PropertyNameRegex)"/>
</Target>

If I understand your question correctly you are trying to get the substring of a MSBuild property. There is no direct way to do string manipulation in MSBuild, like in NAnt. So you have two options:

1). Create separate variables for each part and combine them:

<PropertyGroup>
  <Name>Name</Name>
  <Something>Something</Something>
  <Combined>$(Name)_$(Something)</Combined>
</PropertyGroup>

This works fine if the parts are known before hand, but not if you need to do this dynamically.

2). Write a customer MSBuild task that does the string manipulation. This would be your only option if it needed to done at runtime.

It looks like you could use Item MetaData instead of a Property:

<ItemGroup>
    <Something Include="SomeValue">
        <Name>YourName</Name>
        <SecondName>Foo</SecondName>
    </Something>
</ItemGroup>