在C＃中格式化DateTime

如何格式化日期以以下格式显示03-Feb-2011

我尝试了这个声明，但它没有正常工作

string.Format(visitDate.Value.ToShortDateString(), "dd-MMM-yyyy") 

Answer 1

 visitDate.Value.ToString("dd-MMM-yyyy"); 

假设visitDate是一个DateTime。

Answer 2

你必须使用：

 visitDate.Value.ToString("dd-MMM-yyyy"); 

Answer 3

string.format有效但您使用的参数顺序无效：

 DateTime? visitDate = null; System.Diagnostics.Debug.WriteLine(visitDate == null ? "" : String.Format("{0:dd-MMM-yyyy}", visitDate)); visitDate = DateTime.Now; System.Diagnostics.Debug.WriteLine(visitDate == null ? "" : String.Format("{0:dd-MMM-yyyy}", visitDate)); 

这应该够了吧。

Answer 4

DataTier.ClsGlobal dataBaseObj = new DataTier.ClsGlobal（）;

  string strmessage; int intResult; public string login(string username, string password)// login method { dataBaseObj.sqlconn.Open(); dataBaseObj.sqlCmd = new SqlCommand("SELECT clEmail, clPassword FROM Client where clEmail='" + username + "'", dataBaseObj.sqlconn); dataBaseObj.sqlDr = dataBaseObj.sqlCmd.ExecuteReader(); if (dataBaseObj.sqlDr.Read()) { if (dataBaseObj.sqlDr["clPassword"].Equals(password.ToString())) { strmessage = "client"; dataBaseObj.sqlconn.Close(); } else { intResult++; strmessage = "login not succesfull"; dataBaseObj.sqlconn.Close(); if (intResult == 3) { strmessage = "your Blocked"; } } } // if its not the client is gonna go to workers table else { dataBaseObj.sqlCmd = new SqlCommand("SELECT wuUsername, wuPassword, wuUserType FROM WorkUsers where wuUsername'" + username + "'", dataBaseObj.sqlconn); dataBaseObj.sqlDr = dataBaseObj.sqlCmd.ExecuteReader(); if (dataBaseObj.sqlDr.Read()) { if (dataBaseObj.sqlDr["wuPassword"].Equals(password.ToString())) { strmessage = "Receptionist"; dataBaseObj.sqlconn.Close(); } else { intResult++; strmessage = "login not succesful"; dataBaseObj.sqlconn.Close(); if (intResult == 3) { strmessage = "your Blocked"; } } } } return strmessage; } // this method is for registering the client of the client if not registered public string registration(string clID, string clFirstName, string clSurname, string clStreetAddress, string clCity, string clPostCode, string clHomePhone, string clMobilePhone, string clEmail, string clPassword, string clStatus) { dataBaseObj.sqlconn.Open(); dataBaseObj.sqlCmd = new SqlCommand("insert into Client values(@clID,@clFirstName@clSurname,@clStreetAddress,@clCity,@clPostCode,@clHomePhone,@clMobilePhone,@clEmail,@clPassword@clStatus)", dataBaseObj.sqlconn); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clID", clID); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clFirstName", clFirstName); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clSurname", clSurname); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clStreetAddress", clStreetAddress); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clCity", clCity); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clPostCode", clPostCode); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clHomePhone", clHomePhone); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clMobilePhone", clMobilePhone); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clEmail", clEmail); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clPassword", clPassword); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clStatus", clStatus); intResult = dataBaseObj.sqlCmd.ExecuteNonQuery(); if (intResult == 1) { strmessage = "registeed"; } else { strmessage = "not registeed"; } return strmessage; } // this is for the admin to register the the receptionist public string AdminRegister(string Id, string username, string password) { dataBaseObj.sqlconn.Open(); dataBaseObj.sqlCmd = new SqlCommand("INSERT INTO WorkUsers (wuID, wuUsername, wuPassword) VALUES ('" + Id + "','" + username + "','" + password + "')", dataBaseObj.sqlconn); intResult = intResult = dataBaseObj.sqlCmd.ExecuteNonQuery(); if (intResult == 1) { strmessage = "registeed"; } else { strmessage = "not registeed"; } return strmessage; } // this method is fo receptionist to inser an appoirment public string ReceptioInsert(int appID, string appDateNow, string appTimeNow, string appReason, string appDateofBooking, string appTimeofBooking, int clID, int wuID) { dataBaseObj.sqlconn.Open(); // appDateNow = Convert.ToString(System.DateTime.Now.Year + "/" + System.DateTime.Now.Month + "/" + System.DateTime.Now.DayOfWeek); appDateNow = Convert.ToString(System.DateTime.Now.ToString("m")); //appTimeNow = Convert.ToString(System.DateTime.Now.TimeOfDay); appTimeNow = Convert.ToString(System.DateTime.Now.ToString("hh:mm:ss")); dataBaseObj.sqlCmd = new SqlCommand("SELECT appDateNow, appTimeNow FROM Appointments where appDateNow='" + appTimeNow + "'AND where appTimeNow='" + appTimeNow + "'", dataBaseObj.sqlconn); if (dataBaseObj.sqlDr.Read())// if it reads it means date and time are booked { strmessage = "sorry that time is not available"; } else { dataBaseObj.sqlCmd = new SqlCommand("INSERT INTO Appointments (appID, appDateNow, appTimeNow, appReason, appDateofBooking, appTimeofBooking, clID, wuID) VALUES('" + appID + "','" + appDateNow + "','" + appTimeNow + "','" + appReason + "','" + appDateofBooking + "','" + appTimeofBooking + "','" + clID + "','" + wuID + "')", dataBaseObj.sqlconn); intResult = intResult = dataBaseObj.sqlCmd.ExecuteNonQuery(); if (intResult == 1) { strmessage = "registeed"; } else { strmessage = "not registeed"; } dataBaseObj.sqlconn.Close(); } return strmessage; } // this method is to update the appointment public void updateAppointmen(int appID, string appDateNow, string appTimeNow, string appReason, string appDateofBooking, string appTimeofBooking, int clID, int wuID) { dataBaseObj.sqlconn.Open(); appDateNow = Convert.ToString(System.DateTime.Now.Year + "/" + System.DateTime.Now.Month + "/" + System.DateTime.Now.DayOfWeek); appTimeNow = Convert.ToString(System.DateTime.Now.TimeOfDay); dataBaseObj.sqlCmd = new SqlCommand("UPDATE Appointments SET appDateNow =@appDateNow, appTimeNow =@appTimeNow, appReason =@appReason, appDateofBooking =@appDateofBooking, appTimeofBooking =@appTimeofBooking, clID =@clID, wuID =@wuID where appID='" + appID + "'", dataBaseObj.sqlconn); dataBaseObj.sqlCmd.Parameters.AddWithValue("@appDateNow", appDateNow); dataBaseObj.sqlCmd.Parameters.AddWithValue("@appTimeNow", appTimeNow); dataBaseObj.sqlCmd.Parameters.AddWithValue("@appReason", appReason); dataBaseObj.sqlCmd.Parameters.AddWithValue("@appDateofBooking", appDateofBooking); dataBaseObj.sqlCmd.Parameters.AddWithValue("@appTimeofBooking", appTimeofBooking); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clID", clID); dataBaseObj.sqlCmd.Parameters.AddWithValue("@wuID", wuID); dataBaseObj.sqlCmd.ExecuteNonQuery(); } // this method is to delete the appoinment public void deleteAppointment(int appID) { dataBaseObj.sqlconn.Open(); dataBaseObj.sqlCmd = new SqlCommand("DELETE FROM Appointments whre appID='" + appID + "'"); dataBaseObj.sqlCmd.ExecuteNonQuery(); } // method for client to view the appoinments public DataTable CLientViewAppoitnmet(string date) { dataBaseObj.sqlconn.Open(); dataBaseObj.sqlAdt = new SqlDataAdapter("SELECT appID, appDateNow, appTimeNow, appReason, appDateofBooking, appTimeofBooking, clID, wuID FROM Appointments where appDateNow='" + date + "'", dataBaseObj.sqlconn); dataBaseObj.dt = new DataTable("appoitment"); dataBaseObj.sqlAdt.Fill(dataBaseObj.dt); dataBaseObj.sqlconn.Close(); return dataBaseObj.dt; } 

//此方法用于客户端插入注释公共字符串CLinetInformRecep（int anID，int appID，string anNotes）{dataBaseObj.sqlconn.Open（）; dataBaseObj.sqlCmd = new SqlCommand（“INSERT INTO AppointmentNotes（anID，appID，anNotes）VALUES（’”+ anID +“’，’”+ appID +“’，’”+ anNotes +“’）”，dataBaseObj.sqlconn） ; intResult = intResult = dataBaseObj.sqlCmd.ExecuteNonQuery（）; if（intResult == 1）{strmessage =“registeed”; } else {strmessage =“not registeed”; } dataBaseObj.sqlconn.Close（）; 返回strmessage; } //这是为了接待者查看客户端添加的注释

  public DataTable selectAppointmentNotes() { dataBaseObj.sqlconn.Open(); dataBaseObj.sqlAdt = new SqlDataAdapter("SELECT FROM AppointmentNotes", dataBaseObj.sqlconn); dataBaseObj.dt = new DataTable("appoitment"); dataBaseObj.sqlAdt.Fill(dataBaseObj.dt); dataBaseObj.sqlconn.Close(); return dataBaseObj.dt; } // this methiod is for therapist to view cuurent day appointment public DataTable TherapisViewAppoiments() { dataBaseObj.sqlconn.Open(); dataBaseObj.sqlAdt = new SqlDataAdapter("SELECT appID, appDateNow, appTimeNow, appReason, appDateofBooking, appTimeofBooking, clID, wuID FROM Appointments where appDateNow ='" +System.DateTime.Now.DayOfWeek+"'", dataBaseObj.sqlconn); dataBaseObj.dt = new DataTable("appoitment"); dataBaseObj.sqlAdt.Fill(dataBaseObj.dt); dataBaseObj.sqlconn.Close(); return dataBaseObj.dt; } // this method here is for the therapist to view cuurent day appointment with oppoetunit to filter them public DataTable ViewAllAppoiements(int id, string date) { // this method return the information of appointmenet where the id and date matchs since i have user the operatoe AND dataBaseObj.sqlconn.Open(); dataBaseObj.sqlAdt = new SqlDataAdapter("SELECT appID, appDateNow, appTimeNow, appReason, appDateofBooking, appTimeofBooking, clID, wuID FROM Appointments where appID ='" + id + "'AND where appDateNow='" + date +"'", dataBaseObj.sqlconn); dataBaseObj.dt = new DataTable("appoitment"); dataBaseObj.sqlAdt.Fill(dataBaseObj.dt); dataBaseObj.sqlconn.Close(); return dataBaseObj.dt; } // this method is to update appoitment by therapist public void UpdateAppoiment(int appID, string appDateNow, string appTimeNow, string appReason, string appDateofBooking, string appTimeofBooking, int clID, int wuID) { dataBaseObj.sqlconn.Open(); appDateNow = Convert.ToString(System.DateTime.Now.Year + "/" + System.DateTime.Now.Month + "/" + System.DateTime.Now.DayOfWeek); appTimeNow = Convert.ToString(System.DateTime.Now.TimeOfDay); dataBaseObj.sqlCmd = new SqlCommand("UPDATE Appointments SET appDateNow =@appDateNow, appTimeNow =@appTimeNow, appReason =@appReason, appDateofBooking =@appDateofBooking, appTimeofBooking =@appTimeofBooking, clID =@clID, wuID =@wuID where appID='" + appID + "'", dataBaseObj.sqlconn); dataBaseObj.sqlCmd.Parameters.AddWithValue("@appDateNow", appDateNow); dataBaseObj.sqlCmd.Parameters.AddWithValue("@appTimeNow", appTimeNow); dataBaseObj.sqlCmd.Parameters.AddWithValue("@appReason", appReason); dataBaseObj.sqlCmd.Parameters.AddWithValue("@appDateofBooking", appDateofBooking); dataBaseObj.sqlCmd.Parameters.AddWithValue("@appTimeofBooking", appTimeofBooking); dataBaseObj.sqlCmd.Parameters.AddWithValue("@clID", clID); dataBaseObj.sqlCmd.Parameters.AddWithValue("@wuID", wuID); dataBaseObj.sqlCmd.ExecuteNonQuery(); } // this method is to delete the appoinmet public string deleteAppoinment(int appID) { dataBaseObj.sqlconn.Open(); dataBaseObj.sqlCmd = new SqlCommand("DELETE FROM Appointments whre appID='" + appID + "'"); dataBaseObj.sqlCmd.ExecuteNonQuery(); intResult = intResult = dataBaseObj.sqlCmd.ExecuteNonQuery(); if (intResult == 1) { strmessage = "registeed"; } else { strmessage = "not registeed"; } dataBaseObj.sqlconn.Close(); return strmessage; } // report order by date public DataTable listOfCLient() { dataBaseObj.sqlconn.Open(); dataBaseObj.sqlAdt = new SqlDataAdapter("SELECT clID, clFirstName, clSurname, clStreetAddress, clCity, clPostCode, clHomePhone, clMobilePhone, clEmail, clPassword, clStatus FROM Client", dataBaseObj.sqlconn); dataBaseObj.dt = new DataTable("appoitment"); dataBaseObj.sqlAdt.Fill(dataBaseObj.dt); dataBaseObj.sqlconn.Close(); return dataBaseObj.dt; } public DataTable listOfAppoint() { dataBaseObj.sqlconn.Open(); dataBaseObj.sqlAdt = new SqlDataAdapter("SELECT appID, appDateNow, appTimeNow, appReason, appDateofBooking, appTimeofBooking, clID, wuID FROM Appointments ORDER BY appDateNow", dataBaseObj.sqlconn); dataBaseObj.dt = new DataTable("appoitment"); dataBaseObj.sqlAdt.Fill(dataBaseObj.dt); dataBaseObj.sqlconn.Close(); return dataBaseObj.dt; } public DataTable listAppontBytherapy() { dataBaseObj.sqlconn.Open(); dataBaseObj.sqlAdt = new SqlDataAdapter("SELECT Appointments.appID, Appointments.appDateNow, Appointments.appTimeNow, Appointments.appReason, Appointments.appDateofBooking,Appointments.appTimeofBooking, Appointments.clID, Appointments.wuID, WorkUsers.wuUserType FROM Appointments INNER JOIN WorkUsers ON Appointments.wuID = WorkUsers.wuID ORDER BY WorkUsers.wuUserType", dataBaseObj.sqlconn); dataBaseObj.dt = new DataTable("appoitment"); dataBaseObj.sqlAdt.Fill(dataBaseObj.dt); dataBaseObj.sqlconn.Close(); return dataBaseObj.dt; } } 

}