在List<T>中增加元素

[Li_Eric]

这可能不是关于UiPath的问题，而是关于VB的简单问题。
我想将日期或字符串加入到一个空列表中，我设置了列表的类型是System.Collections.Generic.List<System.DateTime>以及System.Collections.Generic.List<String>，然后用assign中用Date_List = Date.List.Add(StartDate)，但是提示错误“表达式不产生值"。

请问应该怎么写？谢谢。

[Yoichi]

Hi,

Unfortunately, Assign activity doesn’t support void method.
Can you try Invoke Method as the following?

Regards,

[Li_Eric]

Thank you for your prompt reply. It worked.

But I still have question about in which scenario shall we Invoke Method activity. Is this activity used to invoke a existed method in VB but not involved in UiPath?

[Yoichi]

Hi,

Invoke method can call any method for not only class of vb but also any other class including UiPath.

Regards,