主要包含三步：
- 设置结构体，其中的field的名字首字母大写，支持get和set
private struct keyValueList
{
public string Key{get;set;} // key
public List<string> ValueStrList{get;set;} // the string value list for the key
}
- 创建对应的结构体数组
List<keyValueList> gFootprintTypeSelList; // footprint type
gFootprintTypeSelList = new List<keyValueList>();
//1. option1: Guest Blogging
keyValueList keyValueListGuestBlogging = new keyValueList();
keyValueListGuestBlogging.Key = "Guest Blogging";
keyValueListGuestBlogging.ValueStrList = new List<string>();
//keyValueListGuestBlogging.ValueStrList.Add("Specify Footprint");
keyValueListGuestBlogging.ValueStrList.Add("Guest Blogging");
keyValueListGuestBlogging.ValueStrList.Add("Contribute");
keyValueListGuestBlogging.ValueStrList.Add("Write for us");
keyValueListGuestBlogging.ValueStrList.Add("Guest Category");
keyValueListGuestBlogging.ValueStrList.Add("Submit Content");
gFootprintTypeSelList.Add(keyValueListGuestBlogging);
- 把结构体数组赋值给ComboBox的DataSource，把DisplayMember设置为对应的结构体的field的名字（全小写）
cmbFootprintType.DataSource = gFootprintTypeSelList;
cmbFootprintType.DisplayMember = "key";
详见：【已解决】C#中给ComboBox设置数据源
