How to get Build Id from tfs during the build in C#

Question

To get a log link i need the id of current build, I tried to use this in my C# code, but it didn't return Build Id:

var envVars;
envVars = Environment.GetEnvironmentVariables();

Answer 1

The solution is to put this var in txt file via PowerShell script, and than get it by C#

PS:

    if(!(Test-Path -Path C:\BuildVariables)){
    New-Item -ItemType directory -Path C:\BuildVariables
}

Out-File -FilePath C:\BuildVariables\buildId.txt -Force -InputObject $(Build.Buildid)

C#:

public static string ShowEnvironmentVariables()
{
    string var = File.ReadAllText("C:\\BuildVariables\\buildId.txt");

    return var;
}