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【AutoCAD二次开发】一键获取CAD块信息！实用技巧大公开

news 2026/7/1 13:53:30

还在手动查看CAD块属性？这个工具让你一键获取所有块信息！

为什么需要获取块信息？

在CAD设计中，块（Block）是重用图形元素的重要方式。但当你需要：

批量统计图纸中的块
分析块的属性信息
导出块数据做进一步处理
检查动态块的参数设置

传统的手动查看方式效率低下！今天分享一个实用的块信息提取工具。

功能亮点：这个工具能做什么？

✅选择块获取信息- 交互式选择任意块参照
✅通过句柄查找- 用唯一标识快速定位块
✅从文件读取- 直接分析DWG文件中的块
✅批量获取所有块- 一键获取图纸中所有块信息
✅动态属性提取- 专门处理动态块的参数
✅可视化操作- 高亮显示、缩放定位

核心代码解析

1. 选择并获取块信息（最常用）

public async Task<BlockSimpleInfo> SelectAndGetBlockInfoAsync(){ // 创建文档锁定，确保线程安全 using (DocumentLock docLock = doc.LockDocument()) { // 提示用户选择块 var promptOptions = new PromptEntityOptions("\n请选择一个块参照: "); promptOptions.AddAllowedClass(typeof(BlockReference), true); var promptResult = editor.GetEntity(promptOptions); if (promptResult.Status == PromptStatus.OK) { // 获取块参照对象 var blockRef = transaction.GetObject(promptResult.ObjectId, OpenMode.ForRead) as BlockReference; if (blockRef != null) { // 转换为简单信息对象 return ConvertToBlockSimpleInfo(blockRef, transaction); } } }}

注意在选择时必须要用下面代码去文档锁定不然会抛出下面这个异常信息

Autodesk.AutoCAD.Runtime.Exception:“eInvalidInput”

using (DocumentLock docLock = doc.LockDocument())

2. 通过句柄查找块（快速定位）

public async Task<BlockSimpleInfo> GetBlockInfoByHandleAsync(string blockHandle){ // 通过句柄获取对象ID var objectId = GetObjectIdByHandle(blockHandle); if (objectId.IsValid) { var blockRef = transaction.GetObject(objectId, OpenMode.ForRead) as BlockReference; if (blockRef != null) { return ConvertToBlockSimpleInfo(blockRef, transaction); } }}

3. 批量获取所有块信息

public async Task<List<BlockSimpleInfo>> GetAllBlocksInfoAsync(){ var blocks = new List<BlockSimpleInfo>(); // 获取模型空间 var modelSpace = (BlockTableRecord)transaction.GetObject( SymbolUtilityServices.GetBlockModelSpaceId(_currentDocument.Database), OpenMode.ForRead); // 遍历所有实体 foreach (ObjectId objectId in modelSpace) { var entity = transaction.GetObject(objectId, OpenMode.ForRead) as Entity; if (entity is BlockReference blockRef) { var blockInfo = ConvertToBlockSimpleInfo(blockRef, transaction); blocks.Add(blockInfo); } } return blocks;}

信息转换：从块参照到结构数据

private BlockSimpleInfo ConvertToBlockSimpleInfo( BlockReference blockRef, Transaction transaction){ return new BlockSimpleInfo { Id = Guid.NewGuid().ToString(), Name = GetRealBlockName(blockRef, transaction), // 获取真实块名 Handle = blockRef.Handle.ToString(), // 唯一句柄 Layer = blockRef.Layer, // 所在图层 Color = blockRef.Color.ToString(), // 颜色 Position = FormatPosition(blockRef.Position), // 位置坐标 Rotation = ToDegrees(blockRef.Rotation), // 旋转角度 Scale = FormatScale(blockRef.ScaleFactors), // 缩放比例 IsDynamicBlock = blockRef.IsDynamicBlock, // 是否动态块 HasAttributes = blockRef.AttributeCollection.Count > 0 // 是否有属性 };}

这里面BlockSimpleInfo类可以增加别的虎丘参数哦！不局限于实例提供的。

实战演示：创建块信息查看器

步骤1：创建Ribbon按钮

// 在之前Ribbon教程的基础上添加var blockButton = new RibbonButton{ Text = "块信息工具", ShowText = true, Size = RibbonItemSize.Large, CommandHandler = new BlockInfoCommandHandler()};panel.Items.Add(blockButton);

步骤2：创建块信息窗口

<!-- WPF窗口用于显示块信息 --><Window x:Class="BlockInfoViewer" Title="CAD块信息查看器" Height="600" Width="800"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> </Grid.RowDefinitions> <!-- 工具栏 --> <StackPanel Grid.Row="0" Orientation="Horizontal" Margin="10"> <Button Content="选择块" Click="SelectBlock_Click" Width="80"/> <Button Content="获取全部" Click="GetAllBlocks_Click" Width="80"/> <Button Content="高亮显示" Click="HighlightBlock_Click" Width="80"/> <Button Content="缩放定位" Click="ZoomToBlock_Click" Width="80"/> </StackPanel> <!-- 块信息列表 --> <DataGrid Grid.Row="1" x:Name="BlocksGrid" AutoGenerateColumns="False"> <DataGrid.Columns> <DataGridTextColumn Header="名称" Binding="{Binding Name}"/> <DataGridTextColumn Header="图层" Binding="{Binding Layer}"/> <DataGridTextColumn Header="位置" Binding="{Binding Position}"/> <DataGridTextColumn Header="句柄" Binding="{Binding Handle}"/> <DataGridCheckBoxColumn Header="动态块" Binding="{Binding IsDynamicBlock}"/> </DataGrid.Columns> </DataGrid> </Grid></Window>

步骤3：连接CAD与界面

public partial class BlockInfoViewer : Window{ private readonly BlockInfoService _blockService; public BlockInfoViewer() { InitializeComponent(); _blockService = new BlockInfoService(); LoadAllBlocks(); } private async void SelectBlock_Click(object sender, RoutedEventArgs e) { var blockInfo = await _blockService.SelectAndGetBlockInfoAsync(); if (blockInfo != null) { ShowBlockDetails(blockInfo); } } private async void LoadAllBlocks() { var blocks = await _blockService.GetAllBlocksInfoAsync(); BlocksGrid.ItemsSource = blocks; }}

高级功能：动态块属性提取

public async Task<List<BlockDynamicProperty>> GetBlockDynamicPropertiesAsync( string blockHandle){ var properties = new List<BlockDynamicProperty>(); var blockRef = GetBlockByHandle(blockHandle); if (blockRef != null && blockRef.IsDynamicBlock) { // 获取动态块属性集合 var dynamics = blockRef.DynamicBlockReferencePropertyCollection; foreach (DynamicBlockReferenceProperty property in dynamics) { properties.Add(new BlockDynamicProperty { PropertyName = property.PropertyName, Value = property.Value?.ToString() ?? "", Description = property.Description ?? "", ReadOnly = property.ReadOnly, Visible = property.Show, AllowedValues = GetAllowedValues(property) // 获取允许的值 }); } } return properties;}

选择一个块效果图如下哦:

使用技巧

// 在CAD中，选中块后输入LIST命令// 或在程序中：blockRef.Handle.ToString()

技巧2：处理动态块的特殊情况

// 动态块的真实名称在DynamicBlockTableRecord中if (blockRef.IsDynamicBlock){ var btr = transaction.GetObject(blockRef.DynamicBlockTableRecord, OpenMode.ForRead) as BlockTableRecord; string realName = btr?.Name ?? blockRef.Name;}

当发现你拿取的块名不对时那说明你拿取了动态块的名称了例如*U3，需要做一下处理才能拿到对应的名称哦！