添加项目文件。

Szmedi.RvKits/Samples/ChangeElementColor.csx

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+//
+// CmdChangeElementColor.cs - Change element colour using OverrideGraphicSettings for active view
+//
+// Also change its category's material to a random material
+//
+// Copyright (C) 2020 by Jeremy Tammik, Autodesk Inc. All rights reserved.
+//
+// Keywords: The Building Coder Revit API C# .NET add-in.
+//
+using Autodesk.Revit.UI.Selection;
+
+View view = doc.ActiveView;
+ElementId id;
+
+try
+{
+    Selection sel = uidoc.Selection;
+    Reference r = sel.PickObject(ObjectType.Element, "修改元素颜色");
+    id = r.ElementId;
+}
+catch (Autodesk.Revit.Exceptions.OperationCanceledException)
+{
+    return Result.Cancelled;
+}
+
+ChangeElementColor(doc, id);
+
+ChangeElementMaterial(doc, id);
+
+return Result.Succeeded;
+
+void ChangeElementColor(Document doc, ElementId id)
+{
+    Color color = new Color(
+      (byte)200, (byte)100, (byte)100);
+
+    OverrideGraphicSettings ogs = new OverrideGraphicSettings();
+    ogs.SetProjectionLineColor(color);
+
+    using (Transaction tx = new Transaction(doc))
+    {
+        tx.Start("修改元素颜色");
+        doc.ActiveView.SetElementOverrides(id, ogs);
+        tx.Commit();
+    }
+}
+
+void ChangeElementMaterial(Document doc, ElementId id)
+{
+    Element e = doc.GetElement(id);
+
+    if (null != e.Category)
+    {
+        int im = e.Category.Material.Id.IntegerValue;
+
+        List<Material> materials = new List<Material>(
+          new FilteredElementCollector(doc)
+            .WhereElementIsNotElementType()
+            .OfClass(typeof(Material))
+            .ToElements()
+            .Where<Element>(m
+             => m.Id.IntegerValue != im)
+            .Cast<Material>());
+
+        Random r = new Random();
+        int i = r.Next(materials.Count);
+
+        using (Transaction tx = new Transaction(doc))
+        {
+            tx.Start("修改元素材质");
+            e.Category.Material = materials[i];
+            tx.Commit();
+        }
+    }
+}