Question

实际上，我在c sharp dot net 2008中有2个dateTimePicker。他们两个都执行相同的事件。但是其中一个没有正常工作，直到我使用另一个。请帮帮我!!!!

    private void dtpStart_ValueChanged(object sender, EventArgs e)
    {

        if (cmbDay.SelectedIndex == -1 || cmbLeaveName.SelectedIndex == -1)
        {
            MessageBox.Show("Please select Day and Leave Name", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            dtpStart.ValueChanged -= new EventHandler(dtpStart_ValueChanged);

        }
        if (dtpStart.Value > dtpEnd.Value)
        {
              MessageBox.Show("The End date of leave cannot be occur before date of leave ", "Invalid Entry", MessageBoxButtons.OK);
            dtpStart.Value = dtpEnd.Value;
        }
        getdays();
        check = validate();
        if (check == "Incorrect")
        {
            check = "Correct";
            return;
        }
        LoadDataGridView();

    }


   private void dtpEnd_ValueChanged(object sender, EventArgs e)
    {
        if (cmbDay.SelectedIndex == -1 || cmbLeaveName.SelectedIndex == -1)
        {
            MessageBox.Show("Please select Day and Leave Name","Error",MessageBoxButtons.OK,MessageBoxIcon.Exclamation);
            dtpEnd.ValueChanged -= new EventHandler(dtpEnd_ValueChanged);
            return;

        }
        if (dtpEnd.Value < dtpStart.Value)
        {
            MessageBox.Show("The End date of leave cannot be occur before date of leave ", "Invalid Entry", MessageBoxButtons.OK);
            dtpEnd.Value = dtpStart.Value;

        }
        getdays();
        check = validate();
        if (check == "Incorrect")
        {
            check = "Correct";
            return;
        }
        LoadDataGridView();

    }



    private void getdays()
    {
        double ts = GetDateDifference();
        if (cmbDay.Text.ToString() == "Full Day")
        {
            txtLeaveApplied.Text = ts.ToString();
        }
        else if (cmbDay.Text.ToString() == "Half Day")
        {
            txtLeaveApplied.Text = ((float.Parse(ts.ToString())) / 2).ToString();
        }

    }
    private string validate()
    {
        string Name = cmbApplicantName.Text.ToString();
        string EMP_ID = GetEmpId(Name);
        DataTable dtvalidate = new DataTable();

        dtvalidate = LI.ValidateLeaveInfo(EMP_ID,
           DateTime.Parse(dtpStart.Value.ToShortDateString()),
           DateTime.Parse(dtpEnd.Value.ToShortDateString()));
        if (dtvalidate.Rows.Count > 0)
        {
            StringBuilder date = new StringBuilder();
            foreach (DataRow row in dtvalidate.Rows)
            {
                date.Append(row["Leave_Date"].ToString() + Environment.NewLine);
            }
            MessageBox.Show("Leave Already applied in following Date(s)" +
                Environment.NewLine + date, "Select valid date", MessageBoxButtons.OK,
                MessageBoxIcon.Exclamation);
            check = "Incorrect";
            dgvLeaveApplication.Rows.Clear();

        }
        dtvalidate.Rows.Clear();
        dtvalidate.Dispose();
        return check;
    }


    private void LoadDataGridView()
    {

        double ts = GetDateDifference();
        dgvLeaveApplication.Rows.Clear();
        DateTime dt = DateTime.Parse(dtpStart.Value.ToShortDateString());
        for (int i = 0; i < Convert.ToInt32(ts.ToString()); i++)
        {
            dgvLeaveApplication.Rows.Add(dgvLeaveApplication.Rows.Count,
                dt.ToShortDateString(), cmbLeaveName.SelectedValue.ToString());

            dt = dt.AddDays(1);

        }
        dgvLeaveApplication.Refresh();
    }

Answer 1

检查两个组件的AutoPostBack属性。

Answer 2

您的代码中有一些非常奇怪的结构。如，

check = validate();
if (check == "Incorrect")
{
    check = "Correct";
    return;
}

（为什么没有Validate（）返回一个bool？你为什么忽略验证错误？）我的建议是重构，重命名和更改方法的签名，以便代码变得可读。这将使您更容易找到错误。

您是否使用调试器单步执行代码？两个采摘者的活动都被提升了吗？

修改您删除处理程序但从不添加它。因此，在删除它之后，您必须决定何时再次添加它。魔术不会发生这种情况！

DateTimePicker无法正常工作

2 个答案: