/// <summary>
/// 删除实体的缩放比例
/// </summary>
/// <param name="entId">实体的Id</param>
/// <param name="scaleNames">缩放比例名列表</param>
public static void RemoveScale(this ObjectId entId, params string[] scaleNames)
{
//获取entId指示的实体对象
DBObject obj = entId.GetObject(OpenMode.ForRead);
//如果实体对象支持注释缩放
if (obj.Annotative != AnnotativeStates.NotApplicable)
{
//获得对象所有的注释比例
List <ObjectContext> scales = entId.GetAllScales();
obj.UpgradeOpen();//切换实体为写的状态
//获取当前图形的对象比例管理器
ObjectContextManager ocm = obj.Database.ObjectContextManager;
//获取当前图形的注释比例列表，名为ACDB_ANNOTATIONSCALES
ObjectContextCollection occ = ocm.GetContextCollection("ACDB_ANNOTATIONSCALES");
//遍历需要设置的注释比例
foreach (string scaleName in scaleNames)
{
//获取名为scaleName的注释比例
ObjectContext scale = occ.GetContext(scaleName);
//若不存在scaleName的注释比例，则结束本次循环
if (scale == null)
{
continue;
}
//删除名为scaleName的注释比例
ObjectContexts.RemoveContext(obj, scale);
}
obj.DowngradeOpen();//为了安全将实体切换为读的状态
}
}
