/// <summary>
/// 依據Column * Row調整投票選項數量
/// </summary>
private void ChangeVoteCandidate()
{
int count = this.Column * this.Row;
//刪除多餘選項
while (_voteCandidateColle.Count > count)
{
VoteCandidateVM del = _voteCandidateColle.ElementAt(count);
del.Clear();
del.CommandAction = null;
_voteCandidateColle.RemoveAt(count);
}
//新增不足選項
while (_voteCandidateColle.Count < count)
{
VoteCandidateVM candidate = new VoteCandidateVM();
_voteCandidateColle.Add(candidate);
}
//初始化所有選項編號與狀態
for (int i = 0; i < _voteCandidateColle.Count; i++)
{
_voteCandidateColle.ElementAt(i).Num = i + 1;
_voteCandidateColle.ElementAt(i).IsShowStatistic = this.IsShowStatistic;
_voteCandidateColle.ElementAt(i).IsShowVoterListButton = this.IsShowVoterListButton;
_voteCandidateColle.ElementAt(i).IsShowVoterSlide = this.IsShowVoterSlide;
}
}
/// <summary>
/// 解析留言是否為有效票並進行投票
/// </summary>
/// <param name="vm">留言</param>
/// <returns>若投票成功則回傳True</returns>
public bool Vote(CommentVM vm)
{
//判斷投票是否已開始
if (!this.IsStarted)
{
return(false);
}
int voteNum = 0;
if (Int32.TryParse(vm.Message, out voteNum))
{
//判斷是否已投過票
bool isVoted = _voterTable.IsVoted(vm.AuthorID);
if (isVoted)
{
if (!this.CanChangeVote)
{
//不允許換票
//判斷投票者是否已投滿票數
if (_voterTable.GetVoterCount(vm.AuthorID) >= this.MaxVoteCount)
{
return(false);
}
}
else if (this.CanChangeVote &&
this.MaxVoteCount == 1)
{
//允許換票,單票制
//移除舊票
Dictionary <CommentVM, VoteCandidateVM> tickets = _voterTable.GetVoterTicket(vm.AuthorID);
if (tickets != null)
{
VoteCandidateVM candidate = tickets.Values.ElementAt(0);
CommentVM oldVote = tickets.Keys.ElementAt(0);
candidate.RemoveVote(oldVote);
tickets.Remove(oldVote);
_allVoteColle.Remove(oldVote);
}
}
else if (this.CanChangeVote &&
this.MaxVoteCount > 1)
{
//允許換票,多票制
}
}
//計票
bool isValidVote = false;
foreach (VoteCandidateVM candidate in _voteCandidateColle)
{
if (candidate.Num == voteNum)
{
_voterTable.Add(vm, candidate);
_allVoteColle.Add(vm);
OnPropertyChanged(nameof(this.VoteCount));
candidate.AddVoter(vm);
isValidVote = true;
break;
}
}
//計所有得票率
if (isValidVote)
{
foreach (VoteCandidateVM candidate in _voteCandidateColle)
{
candidate.Rate = Math.Round((double)candidate.Count / this.VoteCount, 4) * 100;
}
}
return(isValidVote);
}
return(false);
}