Use project directory as a working directory for Aspire processes (#49901)

Author: tmat

src/BuiltInTools/dotnet-watch/Aspire/AspireServiceFactory.cs

@@ -211,7 +211,7 @@ private ProjectOptions GetProjectOptions(ProjectLaunchRequest projectLaunchInfo)
             {
                 IsRootProject = false,
                 ProjectPath = projectLaunchInfo.ProjectPath,
-                WorkingDirectory = _projectLauncher.EnvironmentOptions.WorkingDirectory,
+                WorkingDirectory = Path.GetDirectoryName(projectLaunchInfo.ProjectPath) ?? throw new InvalidOperationException(),
                 BuildArguments = _hostProjectOptions.BuildArguments,
                 Command = "run",
                 CommandArguments = GetRunCommandArguments(projectLaunchInfo, hostLaunchProfile),

test/TestAssets/TestProjects/WatchAspire/WatchAspire.ApiService/Program.cs

@@ -1,5 +1,9 @@
+using System;
+
 var builder = WebApplication.CreateBuilder(args);
 
+Console.WriteLine($"ApiService working directory: '{Environment.CurrentDirectory}'");
+
 // Add service defaults & Aspire components.
 builder.AddServiceDefaults();
 

test/dotnet-watch.Tests/HotReload/ApplyDeltaTests.cs

@@ -1054,6 +1054,9 @@ public async Task Aspire_BuildError_ManualRestart()
             // wait until after DCP session started:
             await App.WaitUntilOutputContains("dotnet watch ⭐ Session started: #1");
 
+            // working directory of the service should be it's project directory:
+            await App.WaitUntilOutputContains($"ApiService working directory: '{Path.GetDirectoryName(serviceProjectPath)}'");
+
             // Service -- valid code change:
             UpdateSourceFile(
                 serviceSourcePath,
@@ -1078,7 +1081,7 @@ public async Task Aspire_BuildError_ManualRestart()
             await App.AssertOutputLineStartsWith("  ❔ Do you want to restart these projects? Yes (y) / No (n) / Always (a) / Never (v)");
 
             App.AssertOutputContains("dotnet watch ⌚ Restart is needed to apply the changes.");
-            App.AssertOutputContains($"dotnet watch ❌ {serviceSourcePath}(36,1): error ENC0020: Renaming record 'WeatherForecast' requires restarting the application.");
+            App.AssertOutputContains($"dotnet watch ❌ {serviceSourcePath}(40,1): error ENC0020: Renaming record 'WeatherForecast' requires restarting the application.");
             App.AssertOutputContains("dotnet watch ⌚ Affected projects:");
             App.AssertOutputContains("dotnet watch ⌚   WatchAspire.ApiService");
             App.Process.ClearOutput();