diff --git a/src/Pharmacist.MsBuild.NuGet/PharmacistNuGetTask.cs b/src/Pharmacist.MsBuild.NuGet/PharmacistNuGetTask.cs
index 79dee28..11e5fba 100644
--- a/src/Pharmacist.MsBuild.NuGet/PharmacistNuGetTask.cs
+++ b/src/Pharmacist.MsBuild.NuGet/PharmacistNuGetTask.cs
@@ -7,10 +7,10 @@
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.IO;
-
+using System.Linq;
 using Microsoft.Build.Framework;
 using Microsoft.Build.Utilities;
-
+using NuGet.Frameworks;
 using NuGet.LibraryModel;
 using NuGet.Versioning;
 
@@ -41,10 +41,20 @@ public class PharmacistNuGetTask : Task, IEnableLogger
         [Required]
         public ITaskItem[] PackageReferences { get; set; }
 
+        /// <summary>
+        /// Gets or sets the guids of the project types.
+        /// </summary>
+        public string ProjectTypeGuids { get; set; }
+
+        /// <summary>
+        /// Gets or sets the version of the project type.
+        /// </summary>
+        public string TargetFrameworkVersion { get; set; }
+
         /// <summary>
         /// Gets or sets the target framework.
         /// </summary>
-        public string TargetFramework { get; set; } = DefaultTargetFramework;
+        public string TargetFramework { get; set; }
 
         /// <summary>
         /// Gets or sets the output file.
@@ -64,40 +74,22 @@ public override bool Execute()
                 return false;
             }
 
-            if (string.IsNullOrWhiteSpace(TargetFramework))
+            var nugetFrameworks = GetTargetFrameworks();
+            if (nugetFrameworks == null)
             {
-                TargetFramework = DefaultTargetFramework;
+                Log.LogError("Neither TargetFramework nor ProjectTypeGuids have been correctly set.");
+                return false;
             }
 
             using (var writer = new StreamWriter(Path.Combine(OutputFile)))
             {
-                var packages = new List<LibraryRange>();
-
-                // Include all package references that aren't ourselves.
-                foreach (var packageReference in PackageReferences)
-                {
-                    var include = packageReference.GetMetadata("PackageName");
-
-                    if (ExclusionPackageReferenceSet.Contains(include))
-                    {
-                        continue;
-                    }
-
-                    if (!VersionRange.TryParse(packageReference.GetMetadata("Version"), out var nuGetVersion))
-                    {
-                        this.Log().Error($"Package {include} does not have a valid Version.");
-                        continue;
-                    }
-
-                    var packageIdentity = new LibraryRange(include, nuGetVersion, LibraryDependencyTarget.Package);
-                    packages.Add(packageIdentity);
-                }
+                var packages = GetPackages();
 
                 ObservablesForEventGenerator.WriteHeader(writer, packages).ConfigureAwait(false).GetAwaiter().GetResult();
 
                 try
                 {
-                    ObservablesForEventGenerator.ExtractEventsFromNuGetPackages(writer, packages, TargetFramework.ToFrameworks()).GetAwaiter().GetResult();
+                    ObservablesForEventGenerator.ExtractEventsFromNuGetPackages(writer, packages, nugetFrameworks).GetAwaiter().GetResult();
                 }
                 catch (Exception ex)
                 {
@@ -108,5 +100,56 @@ public override bool Execute()
 
             return true;
         }
+
+        private IReadOnlyCollection<NuGetFramework> GetTargetFrameworks()
+        {
+            IReadOnlyCollection<NuGetFramework> nugetFrameworks;
+            if (!string.IsNullOrWhiteSpace(TargetFramework))
+            {
+                nugetFrameworks = TargetFramework.ToFrameworks();
+            }
+            else
+            {
+                if (string.IsNullOrWhiteSpace(ProjectTypeGuids) || string.IsNullOrWhiteSpace(TargetFrameworkVersion))
+                {
+                    return null;
+                }
+
+                var splitProjectTypeGuids = ProjectTypeGuids
+                    .Split(new[] { ";" }, StringSplitOptions.RemoveEmptyEntries)
+                    .Select(x => new Guid(x.Trim()));
+
+                nugetFrameworks = new List<NuGetFramework> { splitProjectTypeGuids.GetTargetFramework(TargetFrameworkVersion) };
+            }
+
+            return nugetFrameworks;
+        }
+
+        private List<LibraryRange> GetPackages()
+        {
+            var packages = new List<LibraryRange>();
+
+            // Include all package references that aren't ourselves.
+            foreach (var packageReference in PackageReferences)
+            {
+                var include = packageReference.GetMetadata("PackageName");
+
+                if (ExclusionPackageReferenceSet.Contains(include))
+                {
+                    continue;
+                }
+
+                if (!VersionRange.TryParse(packageReference.GetMetadata("Version"), out var nuGetVersion))
+                {
+                    this.Log().Error($"Package {include} does not have a valid Version.");
+                    continue;
+                }
+
+                var packageIdentity = new LibraryRange(include, nuGetVersion, LibraryDependencyTarget.Package);
+                packages.Add(packageIdentity);
+            }
+
+            return packages;
+        }
     }
 }
diff --git a/src/Pharmacist.MsBuild.NuGet/ProjectGuidToTargetFramework.cs b/src/Pharmacist.MsBuild.NuGet/ProjectGuidToTargetFramework.cs
new file mode 100644
index 0000000..2317d40
--- /dev/null
+++ b/src/Pharmacist.MsBuild.NuGet/ProjectGuidToTargetFramework.cs
@@ -0,0 +1,38 @@
+// Copyright (c) 2019 .NET Foundation and Contributors. All rights reserved.
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+using System;
+using System.Collections.Generic;
+using NuGet.Frameworks;
+
+namespace Pharmacist.MsBuild.NuGet
+{
+    /// <summary>
+    /// Converts the project guid format into a target framework value.
+    /// </summary>
+    internal static class ProjectGuidToTargetFramework
+    {
+        private static readonly Dictionary<Guid, string> _guidToFramework = new Dictionary<Guid, string>()
+        {
+            [new Guid("EFBA0AD7-5A72-4C68-AF49-83D382785DCF")] = "MonoAndroid",
+            [new Guid("6BC8ED88-2882-458C-8E55-DFD12B67127B")] = "Xamarin.iOS",
+            [new Guid("A5A43C5B-DE2A-4C0C-9213-0A381AF9435A")] = "uap",
+            [new Guid("A3F8F2AB-B479-4A4A-A458-A89E7DC349F1")] = "Xamarin.Mac",
+        };
+
+        public static NuGetFramework GetTargetFramework(this IEnumerable<Guid> projectGuids, string projectVersionId)
+        {
+            foreach (var projectGuid in projectGuids)
+            {
+                if (_guidToFramework.TryGetValue(projectGuid, out var targetFrameworkValue))
+                {
+                    return new NuGetFramework(targetFrameworkValue, new Version(projectVersionId));
+                }
+            }
+
+            return null;
+        }
+    }
+}
diff --git a/src/Pharmacist.MsBuild.NuGet/targets/Pharmacist.MSBuild.targets b/src/Pharmacist.MsBuild.NuGet/targets/Pharmacist.MSBuild.targets
index 2bd89ee..62283b2 100644
--- a/src/Pharmacist.MsBuild.NuGet/targets/Pharmacist.MSBuild.targets
+++ b/src/Pharmacist.MsBuild.NuGet/targets/Pharmacist.MSBuild.targets
@@ -45,6 +45,8 @@
   <Target Name="GeneratePharmacist" BeforeTargets="CoreCompile">
     <PharmacistNuGetTask PackageReferences="@(PharmacistPackageReference -> WithMetadataValue('InProject', True) )"
                          TargetFramework="$(TargetFramework)"
+                         TargetFrameworkVersion="$(TargetFrameworkVersion)"
+                         ProjectTypeGuids="$(ProjectTypeGuids)"
                          OutputFile="$(IntermediateOutputPath)\Pharmacist.NuGet.g.cs" />
 
     <Message Text="Processed Pharmacist Packages" />