c# - 当我从下拉列表中选择一个值来解决网格中的值时，它会覆盖它

Question

我需要帮助用 Tardy、halfdaypenalty 和 earlyout 减去 MonthlySalary 但添加加类奖励

表格的例子

CREATE TABLE PAYROLL
(
    RegEmpID INT,
    PayID INT IDENTITY (100, 1) PRIMARY KEY,
    TardyPenalty DECIMAL,
    HalfdayPenalty DECIMAL,
    EarlyOutPenalty DECIMAL,
    MonthlySalary DECIMAL,
    OvertimeReward DECIMAL
)

我似乎找不到单独和/或一起解决它们的方法

所以基本上就是这样，asp.net 中有一个下拉列表，其中每个都有一个值，特别是 late = 50 halfday =50 earlyout = 50。薪水已经有一个设定值，每次我尝试时似乎用他们的值覆盖总值。

这是代码

protected void btnupdatepay_Click(object sender, EventArgs e)
{
    double total;
    double tardy;
    double half;
    double early;
    double payroll;
    double overtime;

    total = 0;
    tardy = 0.0;
    half = 0.0;
    early = 0.0;
    payroll = 0.0;
    overtime = 0.0;

    if (Penalty.SelectedValue == "Tardy")
    {
        tardy = 50;
        total = total - tardy;
    }

    if (Penalty.SelectedValue == "Half Day")
    {
        half = 100;
        total = total - half;
    }

    if (Penalty.SelectedValue == "Early Out")
    {
        early = 50;
        total = total - early;
    }

    if (Penalty.SelectedValue == "Overtime")
    {
        overtime = 100;
        total = total + overtime;
    }

    total = total + overtime - half - early - tardy;

    int rowsAffected;

    SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connect"].ConnectionString);
    SqlCommand cmd = new SqlCommand("UPDATE PAYROLL SET [TardyPenalty] = @TardyPenalty, [HalfdayPenalty] = @HalfdayPenalty, [EarlyOutPenalty] = @EarlyOutPenalty , [OvertimeReward] = @OvertimeReward, [MonthlySalary]= @MonthlySalary WHERE [PayID] = @PayID", con);

    cmd.Parameters.AddWithValue("@TardyPenalty", tardy);
    cmd.Parameters.AddWithValue("@HalfdayPenalty", half);
    cmd.Parameters.AddWithValue("@EarlyOutPenalty", early);
    cmd.Parameters.AddWithValue("@PayID", txtpayid.Text);
    cmd.Parameters.AddWithValue("@OvertimeReward", overtime);
    cmd.Parameters.AddWithValue("@MonthlySalary", total);

    try
    {
        con.Open();
        rowsAffected = cmd.ExecuteNonQuery();

        datapay.DataBind();
    }
    finally
    {
        con.Close();
    }
}

也许我做错了什么 - 找不到办法

Answer 1

似乎您的“总计”变量在您的处理程序中应该有不同的名称。尝试使用，例如，_total:

double _total = 0;

//work with _total

total = _total + ...