Enhance log message

Author: Saipriya-1144

src/Detector/DotNetCore/ProjectFileProviders/ExplicitProjectFileProvider.cs

@@ -3,10 +3,10 @@
 // Licensed under the MIT license.
 // --------------------------------------------------------------------------------------------
 
+using System;
 using System.IO;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
-using Microsoft.Oryx.BuildScriptGenerator;
 
 namespace Microsoft.Oryx.Detector.DotNetCore
 {
@@ -18,7 +18,6 @@ internal class ExplicitProjectFileProvider : IProjectFileProvider
     {
         private readonly IOptions<DetectorOptions> options;
         private readonly ILogger<ExplicitProjectFileProvider> logger;
-        private readonly BuildScriptGeneratorOptions commonOptions;
 
         public ExplicitProjectFileProvider(
             IOptions<DetectorOptions> options,
@@ -44,33 +43,19 @@ public string GetRelativePathToProjectFile(DetectorContext context)
             if (context.SourceRepo.FileExists(projectFile))
             {
                 this.logger.LogDebug($"Using the given .NET Core project file to build.");
+                this.logger.LogInformation("Using the given .NET Core project file to build.");
             }
-            else 
+            else
             {
-                this.logger.LogWarning($"Could not find the .NET Core project file.");
-
-                // Check if .NET Core is the target platform before failing
-                var userProvidedPlatformName = this.commonOptions.PlatformName;
-
-                // If platform is not dotnet, skip .NET Core requirements. Dotnet file detection will still happen.
-                if (!string.IsNullOrEmpty(userProvidedPlatformName) && 
-                    !userProvidedPlatformName.Equals("dotnet", StringComparison.OrdinalIgnoreCase))
-                {
-                    this.logger.LogDebug(
-                        $"Target platform is '{userProvidedPlatformName}', not 'dotnet'. " +
-                        "Skipping .NET Core project file requirement.");
-                    return null; 
-                }
-
-                // If platform is dotnet but PROJECT doesn't specify .csproj or .fsproj file
-                if (userProvidedPlatformName.Equals("dotnet", StringComparison.OrdinalIgnoreCase) && 
-                    !IsValidDotNetProjectFile(projectFileWithRelativePath))
+                if (!this.IsValidDotNetProjectFile(projectFileWithRelativePath))
                 {
                     this.logger.LogDebug("PROJECT variable doesn't specify a valid .NET project file (.csproj or .fsproj).");
                     return null;
                 }
 
-                throw new InvalidProjectFileException("Could not find the .NET Core project file.");
+                throw new InvalidProjectFileException(
+                    $"Could not find the .NET Core project file specified in PROJECT environment variable: '{projectFileWithRelativePath}'. " +
+                    "Please ensure the file exists or update the PROJECT environment variable to point to a valid .csproj or .fsproj file.");
             }
 
             return projectFileWithRelativePath;