// Retrieves a property from an MSBuild project file by executing MSBuild and getting MSBuild to print the property.
// We do this by creating a custom MSBuild file which:
// * Will import the project file we're inspecting
// * Has a target that will print a given property
// and then executing MSBuild on this custom MSBuild file.
public static async Task <string> GetPropertyByMSBuildEvaluationAsync(this XmlDocument csproj, ILog log, IProcessManager processManager, string projectPath, string evaluateProperty, string dependsOnTargets = "", Dictionary <string, string> properties = null)
{
var xml =
@"<Project DefaultTargets='WriteProperty' xmlns='http://schemas.microsoft.com/developer/msbuild/2003'>
<!-- Import the project we want to inspect -->
<Import Project='$(ProjectFile)' Condition=""'$(ProjectFile)' != ''"" />
<!-- Target to write out the property we want -->
<Target Name='WriteProperty' DependsOnTargets='%DEPENDSONTARGETS%'>
<PropertyGroup>
<_Properties>$(%PROPERTY%)</_Properties>
</PropertyGroup>
<Error Text='The ProjectFile variable must be set.' Condition=""'$(ProjectFile)' == ''"" />
<Error Text='The OutputFile variable must be set.' Condition=""'$(OutputFile)' == ''"" />
<WriteLinesToFile File='$(OutputFile)' Lines='$(_Properties)' Overwrite='true' />
</Target>
</Project>
";
var dir = Path.GetDirectoryName(projectPath);
var inspector = Path.Combine(dir, "PropertyInspector.csproj");
var output = Path.Combine(dir, "PropertyInspector.txt");
try {
File.WriteAllText(inspector, xml.Replace("%PROPERTY%", evaluateProperty).Replace("%DEPENDSONTARGETS%", dependsOnTargets));
using (var proc = new Process()) {
var isDotNetProject = csproj.IsDotNetProject();
proc.StartInfo.FileName = isDotNetProject ? processManager.GetDotNetExecutable(projectPath) : processManager.MSBuildPath;
var args = new List <string> ();
if (isDotNetProject)
{
args.Add("build");
}
args.Add("/p:ProjectFile=" + projectPath);
args.Add("/p:OutputFile=" + output);
foreach (var prop in properties)
{
args.Add($"/p:{prop.Key}={prop.Value}");
}
args.Add(inspector);
proc.StartInfo.Arguments = StringUtils.FormatArguments(args);
proc.StartInfo.WorkingDirectory = dir;
var rv = await processManager.RunAsync(proc, log, timeout : TimeSpan.FromSeconds(15));
if (!rv.Succeeded)
{
throw new Exception($"Unable to evaluate the property {evaluateProperty}.");
}
return(File.ReadAllText(output).Trim());
}
} finally {
File.Delete(inspector);
File.Delete(output);
}
}