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Assets/ModuleEditor/TestEditorWindow.cs

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+using UnityEditor;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+public class TestEditorWindow : EditorWindow {
+	[SerializeField]
+	private VisualTreeAsset m_VisualTreeAsset = default;
+
+	[MenuItem("Window/MuHua/TestEditorWindow")]
+	public static void ShowExample() {
+		TestEditorWindow wnd = GetWindow<TestEditorWindow>();
+		wnd.titleContent = new GUIContent("TestEditorWindow");
+	}
+
+	public void CreateGUI() {
+		// Each editor window contains a root VisualElement object
+		VisualElement root = rootVisualElement;
+
+		// VisualElements objects can contain other VisualElement following a tree hierarchy.
+		VisualElement label = new Label("Hello World! From C#");
+		root.Add(label);
+
+		// Instantiate UXML
+		VisualElement labelFromUXML = m_VisualTreeAsset.Instantiate();
+		root.Add(labelFromUXML);
+	}
+}