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In MsBuild, is it possible to create an MSBuild condition (or another situation) that will evaluate whether a Property is 'defined' (presuming that this is previous to assigning the property a value somewhere)?
The following seems a little too clumsy to be reliable:
<PropertyGroup Label="Undefined State"> <Defined></Defined> </PropertyGroup> <Choose> <When Condition="('$(Defined)' == '' OR '$(Defined)' != '')"> <Message Text="Defined is probably/likely/assuredly defined"/> </When> <Otherwise> <Message Text="Defined is reportedly/maybe/possibly not defined"/> </Otherwise> <Choose> 
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MSBuild lets you set properties on the command line by using the -property (or -p) switch. These global property values override property values that are set in the project file. This includes environment properties, but does not include reserved properties, which cannot be changed.
For example, bin\Debug. Specifies the path to the output directory, relative to the project directory, for example, bin\Debug.
MSBuildProjectDirectory is the property that will give you the full path to the project file which was invoked on the command line.
This file is installed by Visual Studio to the standard $(MSBuildExtensionsPath) location (C:\Program Files\MSBuild).
There exists common method for overriding properties.
Sample from C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets
<PropertyGroup> <TargetFrameworkIdentifier Condition="'$(TargetFrameworkIdentifier)' == ''">.NETFramework</TargetFrameworkIdentifier> <TargetFrameworkVersion Condition=" '$(TargetFrameworkVersion)' == '' ">v4.0</TargetFrameworkVersion> </PropertyGroup> If you will try to get value from $(NeverDefinedProperty) you just get an empty string. Can you describe the problem you want to solve?
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