测试图片：
测试代码段：
//中文
class InvisibleQueryConditionCollection : ControlCollection
3: {
public InvisibleQueryConditionCollection(Control owner)
base(owner)
6: {
7: }
8:
void Add(Control child)
10: {
is InvisibleQueryCondition)
12: {
base.Add(child);
14: }
15: }
16: }