添加项目文件。

Test.DotNet.RevitUI (2016)/ViewModel/DeleteElementViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Autodesk.Revit.UI;
+using DotNet.RevitUI;
+using DotNet.RevitUI.MVVM;
+using Test.DotNet.RevitUI.View;
+
+namespace Test.DotNet.RevitUI.ViewModel
+{
+    public class DeleteElementViewModel : ObservableObject
+    {
+        private int _elementId;
+
+        public int ElementId
+        {
+            get
+            {
+                return _elementId;
+            }
+
+            set
+            {
+                _elementId = value;
+
+                this.RaisePropertyChanged(nameof(ElementId));
+            }
+        }
+
+        /// <summary>
+        /// Revit动态委托命令
+        /// </summary>
+        /// <remarks>也可以直接绑定RevitCommand</remarks>
+        public RevitRelayCommand OK { get; private set; }
+
+        public RelayCommand Cancel { get; private set; }
+
+        public DeleteElementViewModel()
+        {
+            this.ElementId = 0;
+
+            this.OK = new RevitRelayCommand(OnOK, () => ElementId > 0);
+
+            this.Cancel = new RelayCommand(OnCancel);
+        }
+
+        private void OnCancel()
+        {
+            Messenger.Default.Send(this, MainDeleteMatchElement.ClosedToken);
+        }
+
+        private Result OnOK(ExternalCommandData arg)
+        {
+            var uidoc = arg.Application.ActiveUIDocument;
+
+            var doc = uidoc.Document;
+
+            if (doc.GetElement(new Autodesk.Revit.DB.ElementId(ElementId)) is Autodesk.Revit.DB.Element elem)
+            {
+                doc.Invoke(m => 
+                {
+                    try
+                    {
+                        doc.Delete(elem.Id);
+                    }
+                    catch (Exception ex)
+                    {
+                        Autodesk.Revit.UI.TaskDialog.Show("错误", ex.Message);
+                    }
+                });
+
+                Autodesk.Revit.UI.TaskDialog.Show("提示", "删除元素完成");
+
+                return Result.Succeeded;
+            }
+
+            Autodesk.Revit.UI.TaskDialog.Show("警告", "输入元素ID不合法，或者未在当前文档找到此元素ID");
+
+            return Result.Succeeded;
+        }
+    }
+}

Test.DotNet.RevitUI (2016)/ViewModel/RibbonViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using DotNet.RevitUI;
+using DotNet.RevitUI.MVVM;
+using Test.DotNet.RevitUI.Command;
+
+namespace Test.DotNet.RevitUI.ViewModel
+{
+    public class RibbonViewModel : ObservableObject
+    {
+        /// <summary>
+        /// 删除元素 测试
+        /// </summary>
+
+        public RevitCommand DeleteElement { get; set; }
+
+        /// <summary>
+        /// 删除匹配元素 测试
+        /// </summary>
+        public RevitCommand DeleteMatchElement { get; set; }
+
+        /// <summary>
+        /// This is command test 
+        /// </summary>
+        public RevitCommand SplitButton1 { get; set; }
+
+        /// <summary>
+        /// This is command test 
+        /// </summary>
+        public RevitCommand SplitButton2 { get; set; }
+
+        /// <summary>
+        /// This is command test 
+        /// </summary>
+        public RevitCommand FlowButton1 { get; set; }
+
+        /// <summary>
+        /// This is command test 
+        /// </summary>
+        public RevitCommand FlowButton2 { get; set; }
+
+
+        public RibbonViewModel()
+        {
+            this.DeleteElement = new DeleteElementCommand();
+
+            this.DeleteMatchElement = new DeleteMatchElementCommand();
+
+            this.SplitButton1 = new SplitButton1Command();
+
+            this.SplitButton2 = new SplitButton1Command();
+
+            this.FlowButton1 = new FlowButton1Command();
+
+            this.FlowButton2 = new FlowButton1Command();
+        }
+    }
+}