修改命名空间

ShrlAlgoToolkit.RevitCore/Assists/HasActiveDocument.cs

@@ -0,0 +1,11 @@
+using Autodesk.Revit.DB;
+using Autodesk.Revit.UI;
+
+namespace ShrlAlgoToolkit.RevitCore.Assists;
+/// <summary>
+/// 已经打开文档
+/// </summary>
+public class HasActiveDocument : IExternalCommandAvailability
+{
+    public bool IsCommandAvailable(UIApplication applicationData, CategorySet selectedCategories) => applicationData.ActiveUIDocument != null;
+}