我需要我的应用程序从今天起30天过期，我会将当前日期存储在应用程序配置中。如何检查应用程序是否已过期？我不介意用户是否更改了时钟并且应用程序正常工作（用户太愚蠢了）。
if (appmode == "Trial") {
????
}
答案 0 :(得分：50)
string dateInString = "01.10.2009";
DateTime startDate = DateTime.Parse(dateInString);
DateTime expiryDate = startDate.AddDays(30);
if (DateTime.Now > expiryDate) {
//... trial expired
}
答案 1 :(得分：20)
DateTime.AddDays这样做：
DateTime expires = yourDate.AddDays(30);
答案 2 :(得分：13)
我可以自信地回答！
DateTime expiryDate = DateTime.Now.AddDays(30);
或者可能 - 如果您只是希望没有附加时间的日期可能更合适：
DateTime expiryDate = DateTime.Today.AddDays(30);
答案 3 :(得分：13)
DateTime.Now.Add（-30）
给你30天后的日期
答案 4 :(得分：4)
DateTime _expiryDate = DateTime.Now + TimeSpan.FromDays(30);
答案 5 :(得分：2)
可能的解决方案是首次运行，创建一个包含当前日期的文件并将其放入IsolatedStorage。对于后续运行，检查文件的内容并与当前日期进行比较;如果日期差异大于30天，请通知用户并关闭应用程序。
答案 6 :(得分：1)
更好的解决方案可能是引入带计数器的许可证文件。将许可证文件写入应用程序的安装日期（安装期间）。然后，每次运行应用程序时，您都可以编辑许可证文件并将计数增加1.每次应用程序启动时，您只需快速检查是否已达到应用程序的30次使用，即
if (LicenseFile.Counter == 30)
// go into expired mode
如果用户已将系统时钟恢复原状，这也可以解决问题，因为您可以进行简单的检查来说明
if (LicenseFile.InstallationDate < SystemDate)
// go into expired mode (as punishment for trying to trick the app!)
您当前设置的问题是用户必须每天使用该应用程序30天才能完成30天的试用。
答案 7 :(得分：1)
string[] servers = new string[] {
"nist1-ny.ustiming.org",
"nist1-nj.ustiming.org",
"nist1-pa.ustiming.org",
"time-a.nist.gov",
"time-b.nist.gov",
"nist1.aol-va.symmetricom.com",
"nist1.columbiacountyga.gov",
"nist1-chi.ustiming.org",
"nist.expertsmi.com",
"nist.netservicesgroup.com"
};
string dateStart, dateEnd;
void SetDateToday()
{
Random rnd = new Random();
DateTime result = new DateTime();
int found = 0;
foreach (string server in servers.OrderBy(s => rnd.NextDouble()).Take(5))
{
Console.Write(".");
try
{
string serverResponse = string.Empty;
using (var reader = new StreamReader(new System.Net.Sockets.TcpClient(server, 13).GetStream()))
{
serverResponse = reader.ReadToEnd();
Console.WriteLine(serverResponse);
}
if (!string.IsNullOrEmpty(serverResponse))
{
string[] tokens = serverResponse.Split(' ');
string[] date = tokens[1].Split(' ');
string time = tokens[2];
string properTime;
dateStart = date[2] + "/" + date[0] + "/" + date[1];
int month = Convert.ToInt16(date[0]), day = Convert.ToInt16(date[2]), year = Convert.ToInt16(date[1]);
day = day + 30;
if ((month % 2) == 0)
{
//MAX DAYS IS 30
if (day > 30)
{
day = day - 30;
month++;
if (month > 12)
{
month = 1;
year++;
}
}
}
else
{
//MAX DAYS IS 31
if (day > 31)
{
day = day - 31;
month++;
if (month > 12)
{
month = 1;
year++;
}
}
}
string sday, smonth;
if (day < 10)
{
sday = "0" + day;
}
if (month < 10)
{
smonth = "0" + month;
}
dateEnd = sday + "/" + smonth + "/" + year.ToString();
}
}
catch
{
// Ignore exception and try the next server
}
}
if (found == 0)
{
MessageBox.Show(this, "Internet Connection is required to complete Registration. Please check your internet connection and try again.", "Not connected", MessageBoxButtons.OK, MessageBoxIcon.Information);
Success = false;
}
}
我在某些网站的某些部分看到了该代码。上面的示例暴露了一个小故障：将当前时间和日期更改为开始日期会延长应用程序到期时间。
解决方案？请参阅在线时间服务器。
答案 8 :(得分：0)
@Ed courtenay，@ James， 我有一个愚蠢的问题。 如何让用户远离此文件？（包含失效日期的文件）。 如果用户具有安装权限，那么显然用户也可以访问查看文件。 更改文件的扩展名不会有帮助。 那么，如何保护这个文件安全并远离用户手？
答案 9 :(得分：0)
您需要存储程序的第一次运行时才能执行此操作。我怎么可能这样做是使用visual studio中的内置应用程序设置。制作一个名为InstallDate的用户设置，默认为DateTime.MinValue或类似的东西（例如1/1/1900）。
然后当程序运行时，检查很简单：
if (appmode == "trial")
{
// If the FirstRunDate is MinValue, it's the first run, so set this value up
if (Properties.Settings.Default.FirstRunDate == DateTime.MinValue)
{
Properties.Settings.Default.FirstRunDate = DateTime.Now;
Properties.Settings.Default.Save();
}
// Now check whether 30 days have passed since the first run date
if (Properties.Settings.Default.FirstRunDate.AddMonths(1) < DateTime.Now)
{
// Do whatever you want to do on expiry (exception message/shut down/etc.)
}
}
用户设置存储在一个非常奇怪的位置（类似于C：\ Documents and Settings \ YourName \ Local Settings \ Application Data），因此无论如何平均乔很难找到它。如果你想成为偏执狂，只需加密日期，然后再将其保存到设置中。
编辑：叹息，误读了这个问题，没有像我想象的那么复杂＆gt;。＆gt;
答案 10 :(得分：0)
这个问题有点晚了，但是我创建了一个类，其中包含在C＃中创建功能齐全的计时功能所需的所有便捷方法。我将到期时间写入Windows应用程序数据路径，而不是您的应用程序配置，即使在程序关闭后，该时间也将保持不变（找到普通用户的路径也很棘手）。
完整记录且易于使用，希望有人觉得它有用！
public class TimeTrialManager
{
private long expiryTime=0;
private string softwareName = "";
private string userPath="";
private bool useSeconds = false;
public TimeTrialManager(string softwareName) {
this.softwareName = softwareName;
// Create folder in Windows Application Data folder for persistence:
userPath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData).ToString() + "\\" + softwareName + "_prefs\\";
if (!Directory.Exists(userPath)) Directory.CreateDirectory(Path.GetDirectoryName(userPath));
userPath += "expiryinfo.txt";
}
// Use this method to check if the expiry has already been created. If
// it has, you don't need to call the setExpiryDate() method ever again.
public bool expiryHasBeenStored(){
return File.Exists(userPath);
}
// Use this to set expiry as the number of days from the current time.
// This should be called just once in the program's lifetime for that user.
public void setExpiryDate(double days) {
DateTime time = DateTime.Now.AddDays(days);
expiryTime = time.ToFileTimeUtc();
storeExpiry(expiryTime.ToString() );
useSeconds = false;
}
// Like above, but set the number of seconds. This should be just used for testing
// as no sensible time trial would allow the user seconds to test the trial out:
public void setExpiryTime(double seconds) {
DateTime time = DateTime.Now.AddSeconds(seconds);
expiryTime = time.ToFileTimeUtc();
storeExpiry(expiryTime.ToString());
useSeconds = true;
}
// Check for this in a background timer or whenever else you wish to check if the time has run out
public bool trialHasExpired() {
if(!File.Exists(userPath)) return false;
if (expiryTime == 0) expiryTime = Convert.ToInt64(File.ReadAllText(userPath));
if (DateTime.Now.ToFileTimeUtc() >= expiryTime) return true; else return false;
}
// This method is optional and isn't required to use the core functionality of the class
// Perhaps use it to tell the user how long he has left to trial the software
public string expiryAsHumanReadableString(bool remaining=false) {
DateTime dt = new DateTime();
dt = DateTime.FromFileTimeUtc(expiryTime);
if (remaining == false) return dt.ToShortDateString() + " " + dt.ToLongTimeString();
else {
if (useSeconds) return dt.Subtract(DateTime.Now).TotalSeconds.ToString();
else return (dt.Subtract(DateTime.Now).TotalDays ).ToString();
}
}
// This method is private to the class, so no need to worry about it
private void storeExpiry(string value) {
try { File.WriteAllText(userPath, value); }
catch (Exception ex) { MessageBox.Show(ex.Message); }
}
}
这是以上类的典型用法。再简单不过了！
TimeTrialManager ttm;
private void Form1_Load(object sender, EventArgs e)
{
ttm = new TimeTrialManager("TestTime");
if (!ttm.expiryHasBeenStored()) ttm.setExpiryDate(30); // Expires in 30 days time
}
private void timer1_Tick(object sender, EventArgs e)
{
if (ttm.trialHasExpired()) { MessageBox.Show("Trial over! :("); Environment.Exit(0); }
}
答案 11 :(得分：-2)
if (cmb_mode_of_service.SelectedItem != null && cmb_term_of_service.SelectedItem != null)
{
if (cmb_mode_of_service.SelectedIndex > 0 && cmb_term_of_service.SelectedIndex > 0)
{
if (cmb_mode_of_service.SelectedItem.ToString() == "Single Service/Installation" || cmb_term_of_service.SelectedItem.ToString() == "Single Time")
{
int c2 = 1;
char c1 = 'A';
DataRow dr = dt.NewRow();
dr["SN"] = c2++;
dr["serviceid"] = txt_service_id.Text + "-" + c1++;
dr["servicedate"] = service_start_date.Text;
dr["servicestatus"] = "Pending";
dr["serviceexcutive"] = "Not Alowed";
dt.Rows.Add(dr);
dataGridView1.DataSource = dt;
txtexpirydate.Text = (Convert.ToDateTime(service_start_date.Text).AddDays(1)).ToString();
}
else
{
if (cmb_mode_of_service.SelectedItem.ToString() == "Weekly Service")
{
int year = 0;
if (cmb_term_of_service.SelectedItem.ToString() == "One Year")
{
year = 1;
}
if (cmb_term_of_service.SelectedItem.ToString() == "Two Year")
{
year = 2;
}
if (cmb_term_of_service.SelectedItem.ToString() == "three year")
{
year = 3;
}
DateTime currentdate = Convert.ToDateTime(service_start_date.Text);
DateTime Enddate = currentdate.AddYears(+year);
txtexpirydate.Text = Enddate.ToString();
char c1 = 'A';
int c2 = 1;
for (var dt1 = currentdate.AddDays(7); dt1 <= Enddate; dt1 = dt1.AddDays(7))
{
DataRow dr = dt.NewRow();
dr["SN"] = c2++;
dr["serviceid"] = txt_service_id.Text + "-" + c1++;
dr["servicedate"] = dt1.ToString();
dr["servicestatus"] = "Pending";
dr["serviceexcutive"] = "Not Alowed";
//txtexpirydate.Text = dt1.ToString();
dt.Rows.Add(dr);
}
dataGridView1.DataSource = dt;
}
if (cmb_mode_of_service.SelectedItem.ToString() == "Fortnight Service")
{
int year = 0;
if (cmb_term_of_service.SelectedItem.ToString() == "One Year")
{
year = 1;
}
if (cmb_term_of_service.SelectedItem.ToString() == "Two Year")
{
year = 2;
}
if (cmb_term_of_service.SelectedItem.ToString() == "three year")
{
year = 3;
}
DateTime currentdate = Convert.ToDateTime(service_start_date.Text);
DateTime Enddate = currentdate.AddYears(+year);
txtexpirydate.Text = Enddate.ToString();
char c1 = 'A';
int c2 = 1;
for (var dt1 = currentdate.AddDays(15); dt1 <= Enddate; dt1 = dt1.AddDays(15))
{
DataRow dr = dt.NewRow();
dr["SN"] = c2++;
dr["serviceid"] = txt_service_id.Text + "-" + c1++;
dr["servicedate"] = dt1.ToString();
dr["servicestatus"] = "Pending";
dr["serviceexcutive"] = "Not Alowed";
// txtexpirydate.Text = dt1.ToString();
dt.Rows.Add(dr);
}
dataGridView1.DataSource = dt;
}
if (cmb_mode_of_service.SelectedItem.ToString() == "Monthly Service")
{
int year = 0;
if (cmb_term_of_service.SelectedItem.ToString() == "One Year")
{
year = 1;
}
if (cmb_term_of_service.SelectedItem.ToString() == "Two Year")
{
year = 2;
}
if (cmb_term_of_service.SelectedItem.ToString() == "three year")
{
year = 3;
}
DateTime currentdate = Convert.ToDateTime(service_start_date.Text);
DateTime Enddate = currentdate.AddYears(+year);
txtexpirydate.Text = Enddate.ToString();
char c1 = 'A';
int c2 = 1;
for (var dt1 = currentdate.AddDays(30); dt1 <= Enddate; dt1 = dt1.AddDays(30))
{
DataRow dr = dt.NewRow();
dr["SN"] = c2++;
dr["serviceid"] = txt_service_id.Text + "-" + c1++;
dr["servicedate"] = dt1.ToString();
dr["servicestatus"] = "Pending";
dr["serviceexcutive"] = "Not Alowed";
// txtexpirydate.Text = dt1.ToString();
dt.Rows.Add(dr);
}
dataGridView1.DataSource = dt;
}
if (cmb_mode_of_service.SelectedItem.ToString() == "Trimister Service")
{
int year = 0;
if (cmb_term_of_service.SelectedItem.ToString() == "One Year")
{
year = 1;
}
if (cmb_term_of_service.SelectedItem.ToString() == "Two Year")
{
year = 2;
}
if (cmb_term_of_service.SelectedItem.ToString() == "three year")
{
year = 3;
}
DateTime currentdate = Convert.ToDateTime(service_start_date.Text);
DateTime Enddate = currentdate.AddYears(+year);
txtexpirydate.Text = Enddate.ToString();
char c1 = 'A';
int c2 = 1;
for (var dt1 = currentdate.AddDays(90); dt1 <= Enddate; dt1 = dt1.AddDays(90))
{
DataRow dr = dt.NewRow();
dr["SN"] = c2++;
dr["serviceid"] = txt_service_id.Text + "-" + c1++;
dr["servicedate"] = dt1.ToString();
dr["servicestatus"] = "Pending";
dr["serviceexcutive"] = "Not Alowed";
// txtexpirydate.Text = dt1.ToString();
dt.Rows.Add(dr);
}
dataGridView1.DataSource = dt;
}
if (cmb_mode_of_service.SelectedItem.ToString() == "Half Yearly Service")
{
int year = 0;
if (cmb_term_of_service.SelectedItem.ToString() == "One Year")
{
year = 1;
}
if (cmb_term_of_service.SelectedItem.ToString() == "Two Year")
{
year = 2;
}
if (cmb_term_of_service.SelectedItem.ToString() == "three year")
{
year = 3;
}
DateTime currentdate = Convert.ToDateTime(service_start_date.Text);
DateTime Enddate = currentdate.AddYears(+year);
txtexpirydate.Text = Enddate.ToString();
char c1 = 'A';
int c2 = 1;
for (var dt1 = currentdate.AddDays(180); dt1 <= Enddate; dt1 = dt1.AddDays(180))
{
DataRow dr = dt.NewRow();
dr["SN"] = c2++;
dr["serviceid"] = txt_service_id.Text + "-" + c1++;
dr["servicedate"] = dt1.ToString();
dr["servicestatus"] = "Pending";
dr["serviceexcutive"] = "Not Alowed";
// txtexpirydate.Text = dt1.ToString();
dt.Rows.Add(dr);
}
dataGridView1.DataSource = dt;
}
if (cmb_mode_of_service.SelectedItem.ToString() == "Yearly Service")
{
int year = 0;
if (cmb_term_of_service.SelectedItem.ToString() == "One Year")
{
year = 1;
}
if (cmb_term_of_service.SelectedItem.ToString() == "Two Year")
{
year = 2;
}
if (cmb_term_of_service.SelectedItem.ToString() == "three year")
{
year = 3;
}
DateTime currentdate = Convert.ToDateTime(service_start_date.Text);
DateTime Enddate = currentdate.AddYears(+year);
txtexpirydate.Text = Enddate.ToString();
char c1 = 'A';
int c2 = 1;
for (var dt1 = currentdate.AddDays(365); dt1 <= Enddate; dt1 = dt1.AddDays(365))
{
DataRow dr = dt.NewRow();
dr["SN"] = c2++;
dr["serviceid"] = txt_service_id.Text + "-" + c1++;
dr["servicedate"] = dt1.ToString();
dr["servicestatus"] = "Pending";
dr["serviceexcutive"] = "Not Alowed";
//txtexpirydate.Text = dt1.ToString();
dt.Rows.Add(dr);
}
dataGridView1.DataSource = dt;
}
}
}