_update-assemblyinfo.shade

default include='**/AssemblyInfo.cs'
default assemblyVersion=''
default assemblyFileVersion='${assemblyVersion}'

update-file each='var updateFile in Files.Include(include)'
    @{
        if (!string.IsNullOrWhiteSpace(assemblyVersion))
            updateText = Replace(updateText, "AssemblyVersion\\([^\\)]*\\)", "AssemblyVersion(\"" + assemblyVersion + "\")");
        if (!string.IsNullOrWhiteSpace(assemblyFileVersion))
            updateText = Replace(updateText, "AssemblyFileVersion\\([^\\)]*\\)", "AssemblyFileVersion(\"" + assemblyFileVersion + "\")");
    }

functions
  @{
    string Replace(string text, string pattern, string replace)
    {
        return System.Text.RegularExpressions.Regex.Replace(text, pattern, replace);
    }
  }