我有一份清单.
可能的成员(x123,y123,z123,a123,b123,c123).// 123是示例此"mylist"可能包含以x开头的成员,或者可能不包含.y,z,a,b,c也是如此.
If contains a member starts with x:
//Formula Contains X
If Not Contains a member starts with x:
//Formula Not Contains X
//same as all of x,y,z,a,b,c. But unlike a foreach, I must place the formulas at checking time, not after.
我怎样才能做到这一点？