// Search for group members by the keyword and group ID
GroupMemberSearchParam param = new GroupMemberSearchParam
{
  group_search_member_params_groupid_list = new List<string>
  {
    "group_id"
  },
  group_search_member_params_keyword_list = new List<string>
  {
    "Keyword 1"
  },
  group_search_member_params_field_list = new List<TIMGroupMemberSearchFieldKey>
  {
    TIMGroupMemberSearchFieldKey.kTIMGroupMemberSearchFieldKey_Identifier,
    TIMGroupMemberSearchFieldKey.kTIMGroupMemberSearchFieldKey_NikeName,
    TIMGroupMemberSearchFieldKey.kTIMGroupMemberSearchFieldKey_Remark,
    TIMGroupMemberSearchFieldKey.kTIMGroupMemberSearchFieldKey_NameCard,
  }
};
TIMResult res = TencentIMSDK.GroupSearchGroupMembers(param, (int code, string desc, List<GroupGetOnlineMemberCountResult> result, string user_data)=>{
 // Process the async logic
});