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本文主要給大家介紹一下SmartSoft中用C#.Net實現AutoCAD塊屬性提取的方法，并給出實例代碼與大家共享。此類實現AutoCAD塊屬性提取功能，在VS.Net2003(2005)+AutoCAD2004(2007)下調試通過。

以下是引用片段：

using System;

using AutoCAD=Autodesk.AutoCAD.Interop;

using System.Runtime.InteropServices ;

using dbx = Autodesk.AutoCAD.Interop.Common;

namespace SmartSoft.ACAD

{

///

/// 讀取AutoCAD屬性信息

///

public class AutoCADConnector:IDisposable

{

private AutoCAD.AcadApplication _Application;

private bool _Initialized;

private bool _Disposed;

#region 類初始化及析構操作

///

/// 類初始化，試圖獲取一個正在運行的AutoCAD實例，

/// 如果沒有則新起動一個實例。

///

public AutoCADConnector()

{

try

{

//取得一個正在運行的AUTOCAD實例

this._Application = (AutoCAD.AcadApplication)Marshal.GetActiveObject("AutoCAD.Application.17");

}//end of try

catch

{

try

{

//建立一個新的AUTOCAD實例，并標識已經建立成功。

_Application = new AutoCAD.AcadApplicationClass();

_Initialized=true;

}

catch

{

throw new Exception ("無法起動AutoCAD應用程序，確認已經安裝");

}

}//end of catch

}//end of AutoCADConnector

~AutoCADConnector()

{

Dispose(false);

}

public void Dispose()

{

Dispose(true);

GC.SuppressFinalize(this);

}

protected virtual void Dispose(bool disposing)

{

if (!this._Disposed && this._Initialized )

{

//如果建立了AUTOCAD的實列，調用QUIT方法以避免內存漏洞

this._Application.ActiveDocument.Close (false,"");

this._Application.Quit();

this._Disposed=true;

}

}

#endregion

#region 公共用戶接口屬性

///

/// 取得當前類所獲得的AUTOCAD實例

///

public AutoCAD.AcadApplication Application

{

get

{

return _Application;

}

}//end of Application

#endregion

#region 公共用戶接口方法

///

/// 根據給定的文件名以AxDbDocument類型返回該文檔

///

public dbx.AxDbDocument GetThisDrawing(string FileName,string PassWord)

{

ACAD.AutoCADConnector Connector=new AutoCADConnector();

//這是AutoCAD2004的Programe ID

string programeID ="ObjectDBX.AxDbDocument.17";

AutoCAD.AcadApplication AcadApp = Connector.Application;

dbx.AxDbDocument dbxDoc;

dbxDoc=(dbx.AxDbDocument)AcadApp.GetInterfaceObject(programeID);

try

{

if (System.IO.File.Exists (FileName)==false) throw new Exception ("文件不存在。");

dbxDoc.Open(FileName,PassWord);

}// end of try

catch (Exception e)

{

System.Windows.Forms.MessageBox.Show(e.Message );

dbxDoc=null;

}

return dbxDoc;

}//end of function GetThisDrawing

///

/// 根據當前文檔和塊名取得當前塊的引用

///

public dbx.AcadBlockReference GetBlockReference(dbx.AxDbDocument thisDrawing,string blkName)

{

dbx.AcadBlockReference blkRef=null;

bool found = false;

try

{

foreach (dbx.AcadEntity entity in thisDrawing.ModelSpace )

{

if (entity.EntityName=="AcDbBlockReference")

{

blkRef=(dbx.AcadBlockReference)entity;

//System.Windows.Forms.MessageBox.Show(blkRef.Name);

if (blkRef.Name.ToLower() ==blkName.ToLower() )

{

found = true;

break;

}

}//end of entity.EntityName=="AcDbBlockReference"

}// end of foreach thisDrawing.ModelSpace

}//end of try

catch (Exception e)

{

System.Windows.Forms.MessageBox.Show ("圖形中有未知的錯誤，格式不正確或圖形數據庫需要修愎。系統錯誤提示：" + e.Message ,"信息",System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Warning);

thisDrawing=null;

}//end of catch

if (!found) blkRef = null;

return blkRef;

}//end of function GetBlockReference

///

/// 根據給定的塊引用(dbx.AcadBlockReference)和屬性名返回屬性值

///

public object GetValueByAttributeName(dbx.AcadBlockReference blkRef,string AttributeName)

{

object[] Atts=(object[])blkRef.GetAttributes();

object attValue=null;

for (int i=0;i

{

dbx.AcadAttributeReference attRef;

attRef=(dbx.AcadAttributeReference)Atts[i];

if (attRef.TagString==AttributeName)

{

attValue= attRef.TextString ;

break;

}

}//end of for i

return attValue;

}// end of function

#endregion

}//end of class CAutoCADConnector

}//end of namespace AutoCAD

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