How get exec task output with msbuild - msbuild

Question

I'm trying to get simple output by exec task with msbuild:
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Target Name="Test">
<Exec Command="echo test output">
<Output TaskParameter="Outputs" ItemName="Test1" />
</Exec>
<Exec Command="echo test output">
<Output TaskParameter="Outputs" PropertyName="Test2" />
</Exec>
<Message Text="----------------------------------------"/>
<Message Text="#(Test1)"/>
<Message Text="----------------------------------------"/>
<Message Text="$(Test2)"/>
<Message Text="----------------------------------------"/>
</Target>
</Project>
But get next output:
echo test output
test output
echo test output
test output
----------------------------------------
----------------------------------------
----------------------------------------
How can I get output by my script?

Answer 1

Good news everyone! You can now capture output from <Exec> as of .NET 4.5.
Like this:
<Exec ... ConsoleToMSBuild="true">
<Output TaskParameter="ConsoleOutput" PropertyName="OutputOfExec" />
</Exec>
Simply:
Add ConsoleToMsBuild="true" to your <Exec> tag
Capture the output using the ConsoleOutput parameter in an <Output> tag
Finally!
Documentation here

Answer 2

If you want to capture output to an array-like structure and not to a plain string where the output lines are separated by a semicolon, use ItemName instead of PropertyName:
<Exec ... ConsoleToMSBuild="true">
<Output TaskParameter="ConsoleOutput" ItemName="OutputOfExec" />
</Exec>

Answer 3

I've gotten to the point where I'm so frustrated with the limitations of MSBuild, and the stuff that's supposed to work but doesn't (at least not in every context), that pretty much anytime I need to do anything with MSBuild, I create a custom build task in C#.
If none of the other suggestions are working, then you could certainly do it that way.

Answer 4

You can pipe the output to a file so to speak, and read it back.
echo test output > somefile.txt