c# - 我怎样才能将参数传递给这个方法

Question

这是方法:

getUsersList(ref List<RealBioSDKUser> userList, 
             int groupId = -1, 
             [DateTimeConstant(0), Optional] DateTime fromDate)

当我像这样传递参数时:

List<RealBioSDKUser> tempUserList=new List<RealBioSDKUser>();
BioClient.getUsersList(ref tempUserList,0, "1900-01-01");

显示此错误:

the best overloaded method match for collections.generic.list like this.

Answer 1

因为 "1900-01-01" 是一个字符串，而不是 DateTime。而是传递一个 DateTime 对象:

BioClient.getUsersList(ref tempUserList,0, new DateTime(1900, 1, 1));