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var list = (List<DepartmentExtend>)this.TreeList_Department.DataSource;
var item = list.Find(x => x.ID == department.ID);
if (item != null)
{
item = new DepartmentExtend(department);
}
this.TreeList_Department.RefreshDataSource(); 刷新数据源
或者
this.TreeList_Department.DataSource = list;