//这是转换操作函数
private void convertToText(PromptSelectionResult SelResult)
{
//初始化转换计数
int count = 0;
//获取选择集所有实体的ID
ObjectId[] ObIDs = SelResult.Value.GetObjectIds();
//启动事务进行实体操作
using (Transaction trans = db.TransactionManager.StartTransaction())
{
//加一个try进行异常处理
try
{
//遍历选择集中的所有实体
foreach (ObjectId ObID in ObIDs)
{
//依据实体ID获取实体对象
//为加快系统处理速度，OpenMode使用ForRead，轮到需要的实体时再用UpgradeOpen()改为ForWrite
DBObject ent = trans.GetObject(ObID, OpenMode.ForRead) as DBObject;
//属性块的情况麻烦些，单独拎出来
if (ent != null)
{
if (ent.GetType().Name == "BlockReference")
{
BlockReference blk = ent as BlockReference;
//判断是否是动态块
if (blk.IsDynamicBlock)
{
AttributeCollection ac = blk.AttributeCollection;
foreach (ObjectId arID in ac)
{
AttributeReference ar = arID.GetObject(OpenMode.ForWrite) as AttributeReference;
if (ar.HasFields)
{
ar.ConvertFieldToText();
count++;
}
}
}
}
if (ent.HasFields)
{
//获取实体的类型进行判断
switch (ent.GetType().Name)
{
//单行文字
case "DBText":
{
DBText Dt = (DBText)ent;
//改为ForWrite
Dt.UpgradeOpen();
//利用DBText的ConvertFieldToText()方法转换
//注：该方法用在不含有字段的文字时会报错
Dt.ConvertFieldToText();
count++;
break;
}
//多行文字
case "MText":
{
MText Dt = (MText)ent;
Dt.UpgradeOpen();
Dt.ConvertFieldToText();
count++;
break;
}
}
}
}
}
//提交事务保存
trans.Commit();
}
catch (Autodesk.AutoCAD.Runtime.Exception Ex)
{
ed.WriteMessage("\n出错了！" + Ex.ToString());
}
finally
{
//关闭事务
trans.Dispose();
}
}
ed.WriteMessage("\n完成转换" + count + "个字段");
}