dotnet upgrade

DotNetSolutionTools.Core/DotNetUpgrade.cs

@@ -0,0 +1,36 @@
+using Microsoft.Build.Construction;
+using Microsoft.Build.Definition;
+using Microsoft.Build.Evaluation;
+
+namespace DotNetSolutionTools.Core;
+
+public static class DotNetUpgrade
+{
+    public static void UpdateProjectsInSolutionToNet80(string solutionFilePath)
+    {
+        var solutionFile = SolutionFile.Parse(solutionFilePath);
+        var csprojList = SolutionProjectParity.GetCSharpProjectObjectsFromSolutionFile(
+            solutionFile
+        );
+        UpdateProjectsToNet80(csprojList);
+    }
+
+    private static void UpdateProjectsToNet80(List<ProjectRootElement> projects)
+    {
+        foreach (var project in projects)
+        {
+            var evalProject = Project.FromProjectRootElement(project, new ProjectOptions(){LoadSettings = ProjectLoadSettings.IgnoreMissingImports});
+            var packages = evalProject.GetItems("PackageReference");
+            //packages.First().Metadata.First().UnevaluatedValue = "9.0.0";
+            var targetFramework = project.PropertyGroups
+                .SelectMany(x => x.Properties)
+                .FirstOrDefault(x => x.Name == "TargetFramework");
+            if (targetFramework?.Value is "net7.0")
+            {
+                targetFramework.Value = "net8.0";
+                project.Save();
+                FormatCsproj.FormatCsprojFile(project.FullPath);
+            }
+        }
+    }
+}