不能string类型隐式转换为System.date.time但在申报日期时间 [英] Cannot Implicitly convert type string to System.date.time but declare in datetime

问题描述

我是一个初学者到C＃和放大器;写一些code.but得到的错误。
错误是：无法string类型隐式转换为System.date.time但我在这里看到我的字符串声明

I'm a begginer to C# & write some code.but getting error there. Error is : Cannot Implicitly convert type string to System.date.time but i see here i declare in string

  public partial class HDate
    {
        private string StartYear;

        public string StartYear1
        {
            get { return StartYear; }
            set { StartYear = value; }
        }
        private string EndYear;

        public string EndYear1
        {
            get { return EndYear; }
            set { EndYear = value; }
        }
        private string Year;

        public string Year1
        {
            get { return Year; }
            set { Year = value; }
        }
        private DateTime StartDate;

        public DateTime StartDate1
        {
            get { return StartDate; }
            set { StartDate = value; }
        }
        private DateTime EndDate;

        public DateTime EndDate1
        {
            get { return EndDate; }
            set { EndDate = value; }
        }
        private string StartMonth;

        public string StartMonth1
        {
            get { return StartMonth; }
            set { StartMonth = value; }
        }
        private string EndMonth;

        public string EndMonth1
        {
            get { return EndMonth; }
            set { EndMonth = value; }
        }
        private DateTime StartDay;

        public DateTime StartDay1
        {
            get { return StartDay; }
            set { StartDay = value; }
        }
        private DateTime EndDay;

        public DateTime EndDay1
        {
            get { return EndDay; }
            set { EndDay = value; }
        }


        public HDate() { }

        public HDate(){
        DateTime today = DateTime.Now;
        int year = today.Year;
        int month = today.Month;
        DateTime day = today;

        DateTime StartDate = (StartYear + StartMonth + StartDay);
        DateTime EndDate   = (EndYear + EndMonth + EndDay);

        if (month <= 6)
        {
            //string StartYear = Convert.ToString(year-1);
            string StartYear = (year - 1).ToString();
            string StartMonth = Convert.ToString(7);
            string EndYear = Convert.ToString(year);
            string EndMonth = Convert.ToString(6);
            string EndDay = Convert.ToString(30);
        }
        else if(month >= 7)

        {
            string StartYear =Convert.ToString(year);
            string StartMonth = Convert.ToString(7);
            string StartDay = Convert.ToString(1);
            string EndYear = Convert.ToString(year+1);
            string EndMonth = Convert.ToString(6);
            string EndDay = Convert.ToString(30);

        }
           return StartDate+';'+EndDate;
       }

这些数据返回给另一个函数..

those data return it to another function..

推荐答案

您已经定义了 StartYear 私人字符串字段中，同样有StartMonth，在C＃中你不能做到以下几点：

You have defined StartYear as private string field, same with StartMonth, In C# you can't do the following:

DateTime StartDate = (StartYear + StartMonth + StartDay)

朝九特派是DateTime类型的，我不知道到底要怎么做，它看起来像你正试图建立从StartYear，StartMonth和StardDay日期。

StartDay is of type DateTime, I am not sure what exactly you want to do, it looks like you are trying to construct the Date from StartYear, StartMonth and StardDay.

如果你可以转换的起始日期，StartMonth和朝九特派到整数，那么你可以使用datetime Constructore，的日期时间（年，月，日）;类似以下;

If you can convert the StartDate, StartMonth and StartDay to integer then you can use the DateTime Constructore , DateTime(Year,month,day); something like following;

    int StartYear = 2012;
    int StartMonth = 06;
    int StartDay = 15;

    DateTime dt = new DateTime(StartYear, StartMonth, StartDay);

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