C# ComboBox绑定值问题

使用这种方式始终绑定值有问题：

cbxschool.datasource = schoollist;
cbxschool.displaymember = "school_name";
cbxschool.valuemember = "school_id";

选择改变事件获取选中值：cbxschool.selectedvalue 始终是对象，不是想要的id。

解决方法：

if (schoollist != null && schoollist.count > 0)
{
cbxschool.items.clear();
for (int i = 0; i < schoollist.count; i++)
{
cbxschool.items.add(schoollist[i].school_name);
}

//选择默认值

int selectindex = schoollist.findindex(a => a.school_id == schoolid);
cbxschool.selectedindex = selectindex == -1 ? 0 : selectindex;

//获取选中值

  string  schoolname = schoollist[cbxschool.selectedindex].school_name;

}