Provides an option to remove the inessential version number from the generated models

src/Umbraco.Core/Configuration/Models/ModelsBuilderSettings.cs

@@ -16,6 +16,7 @@ public class ModelsBuilderSettings
     internal const string StaticModelsDirectory = "~/umbraco/models";
     internal const bool StaticAcceptUnsafeModelsDirectory = false;
     internal const int StaticDebugLevel = 0;
+    internal const bool StaticIncludeVersionNumberInGeneratedModels = true;
     private bool _flagOutOfDateModels = true;
 
     /// <summary>
@@ -78,4 +79,16 @@ public bool FlagOutOfDateModels
     /// <remarks>0 means minimal (safe on live site), anything else means more and more details (maybe not safe).</remarks>
     [DefaultValue(StaticDebugLevel)]
     public int DebugLevel { get; set; } = StaticDebugLevel;
+
+    /// <summary>
+    ///     Gets or sets a value indicating whether the version number should be included in generated models.
+    /// </summary>
+    /// <remarks>
+    ///     By default this is written to the <see cref="System.CodeDom.Compiler.GeneratedCodeAttribute"/> output in
+    ///     generated code for each property of the model. This can be useful for debugging purposes but isn't essential,
+    ///     and it has the causes the generated code to change every time Umbraco is upgraded. In turn, this leads
+    ///     to unnecessary code file changes that need to be checked into source control. Default is <c>true</c>.
+    /// </remarks>
+    [DefaultValue(StaticIncludeVersionNumberInGeneratedModels)]
+    public bool IncludeVersionNumberInGeneratedModels { get; set; } = StaticIncludeVersionNumberInGeneratedModels;
 }

src/Umbraco.Infrastructure/ModelsBuilder/Building/TextBuilder.cs

@@ -143,14 +143,17 @@ public void WriteClrType(StringBuilder sb, Type type)
     //
     // note that the blog post above clearly states that "Nor should it be applied at the type level if the type being generated is a partial class."
     // and since our models are partial classes, we have to apply the attribute against the individual members, not the class itself.
-    private static void WriteGeneratedCodeAttribute(StringBuilder sb, string tabs) => sb.AppendFormat(
+    private void WriteGeneratedCodeAttribute(StringBuilder sb, string tabs) => sb.AppendFormat(
         "{0}[global::System.CodeDom.Compiler.GeneratedCodeAttribute(\"Umbraco.ModelsBuilder.Embedded\", \"{1}\")]\n",
-        tabs, ApiVersion.Current.Version);
+        tabs,
+        Config.IncludeVersionNumberInGeneratedModels ? ApiVersion.Current.Version : null);
 
     // writes an attribute that specifies that an output may be null.
     // (useful for consuming projects with nullable reference types enabled)
     private static void WriteMaybeNullAttribute(StringBuilder sb, string tabs, bool isReturn = false) =>
-        sb.AppendFormat("{0}[{1}global::System.Diagnostics.CodeAnalysis.MaybeNull]\n", tabs,
+        sb.AppendFormat(
+            "{0}[{1}global::System.Diagnostics.CodeAnalysis.MaybeNull]\n",
+            tabs,
             isReturn ? "return: " : string.Empty);
 
     private static string MixinStaticGetterName(string clrName) => string.Format("Get{0}", clrName);