C# 错误：无法将项目值的类型“int”隐式转换为“short”

Question

I am learning C# and keep getting an error "Cannot implicitly convert type 'int' to 'short'".

In Microsoft SQL Server where my database is, U_Weeks_In_Month is defined as smallint. What do I need to do to solve this error?

I tried to use short.Parse just like in the year textfields but this does not work for the item, ie

U_Weeks_In_Month = short.Parse(item.WeekNumber),

Any solution?

My code is:

var weekInfos = SAPUtility.GetWeekInfo(dateTimePicker1.Value, 52);

// Create object
foreach (var item in weekInfos)
{
    // Get new code
    var newWeeklyCode = weeklyPeriodService.GenerateSAPCode();

    var weeklyPeriodAdd =
        new WeeklyPeriod
        {
            Code = newWeeklyCode,
            Name = newWeeklyCode,
            U_Tax_Year = short.Parse(txt_tax_year.Text),
            U_Month = item.Month.ToString(),
            U_Pay_Process_Status = "N",
            U_Payroll_Year = short.Parse(txt_tax_year.Text),
            U_Weeks_In_Month = item.WeekNumber,
            U_Starting_date = item.FirstDayOfWeek,
            U_Ending_date = item.LastDayOfWeek,
        };

    // Save record
    weeklyPeriodService.AddWeeklyPeriod(weeklyPeriodAdd);
}

Answer 1

I suspect you just need:

U_Weeks_In_Month = (short) item.WeekNumber

An alternative is to change your WeekNumber property to short to start with.

Additionally, I'd pull the parsing of txt_tax_year.Text outside the loop:

short taxYear = short.Parse(txt_tax_year.Text);
foreach (var item in weekInfos)
{
    // Use taxYear in here
}

Answer 2

You can cast the item eg: U_Weeks_In_Month = (short)item.WeekNumber,

But I would check why item.WeekNumber is an integer and correct it (assuming the code is yours).

Answer 3

It seems that item.WeekNumber is of type int . In that case compiler is giving the right error. You should be using short.Parse or short.TryParse if you not sure that parsing will succeed.