/// <summary>
/// 创建一个新的多线样式
/// </summary>
/// <param name="db">数据库对象</param>
/// <param name="styleName">多线样式名</param>
/// <param name="elements">加入到多线样式的元素集合</param>
/// <returns>返回加入的多线样式的Id</returns>
public static ObjectId CreateMLineStyle(this Database db, string styleName, List <MlineStyleElement> elements)
{
//打开当前数据库的多线样式字典对象
DBDictionary dict = (DBDictionary)db.MLStyleDictionaryId.GetObject(OpenMode.ForRead);
if (dict.Contains(styleName)) // 如果已经存在指定名称的多线样式
{
return((ObjectId)dict[styleName]); // 返回该多线样式的Id
}
MlineStyle mStyle = new MlineStyle(); // 创建一个多线样式对象
mStyle.Name = styleName; //设置多线样式的名称
//为多线样式添加新的元素
foreach (var element in elements)
{
mStyle.Elements.Add(element, true);
}
dict.UpgradeOpen(); //切换多线字典为写
//在多线样式字典中加入新创建的多线样式对象，并指定搜索关键字为styleName
dict.SetAt(styleName, mStyle);
//通知事务处理完成多线样式对象的加入
db.TransactionManager.AddNewlyCreatedDBObject(mStyle, true);
dict.DowngradeOpen(); //为了安全，将多线样式字典切换成读
return(mStyle.ObjectId); // 返回该多线样式的Id
}
/// <summary>
/// Gets a MLineStyle from the ACAD_MLINESTYLE dictionary.
/// </summary>
/// <param name="transaction">Running transaction.</param>
/// <param name="styleName">Name of the Style.</param>
/// <returns>MLineStyle if the name exists; Otherwise null.</returns>
public static MlineStyle GetMultilineStyle(Transaction transaction, string styleName)
{
MlineStyle style = null;
DBDictionary mlineStyles = GetNamedObjectsDictionary(ACAD_MLINESTYLE);
if (mlineStyles.Contains(styleName))
{
style = transaction.GetObject <MlineStyle>(mlineStyles.GetAt(styleName), OpenMode.ForRead);
}
return(style);
}