清除NumericUpDown [英] Clearing NumericUpDown

问题描述

我对NumericUpDown控件的问题是，当用户从NumericUpDown中选择一个值并取消选中checkBox1并单击保存"按钮时，NumericUpDown的值未清除:

My problem with NumericUpDown control is when the user selects a value from NumericUpDown And unchecks the checkBox1 and clicks the Save button, the value of NumericUpDown not cleared:

 Public Class FormAdd


Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Me.StudenttableBindingSource.AddNew()
End Sub

Private Sub BttnSave_Click(sender As Object, e As EventArgs) Handles BttnSave.Click

    Me.StudenttableBindingSource.EndEdit()
    Me.StudenttableTableAdapter.Update(Me.StudentDataSet.studenttable)
    Me.StudenttableTableAdapter.Fill(Me.StudentDataSet.studenttable)
    MsgBox(" Student Saveed", MsgBoxStyle.Information)
    Me.StudenttableTableAdapter.Fill(Main.StudentDataSet.studenttable)
    Me.Close()
End Sub

Private Sub CheckBox1_CheckedChanged(sender As Object, e As EventArgs) Handles CheckBox1.CheckedChanged
    If CheckBox1.Checked = False Then
        AgeNumericUpDown.Value = AgeNumericUpDown.Minimum
        AgeNumericUpDown.Text = ""
    End If
End Sub

我需要用户选择一个值并取消选中AgeNumericUpDown的CheckBox1值以重置为空字符串.

I need if the user selects a value and unchecks the CheckBox1 value of AgeNumericUpDown to reset to an empty string.

说明:

推荐答案

我使用了不带旋转器的NumericUpDown控件，因为我只需要数字.该控件位于从列表视图选择中调用的子对话框中.当要加载到NumericUpDown控件中的值在listwiew中为零时，该控件中为零.始终必须清除零.这是我将其显示"为空白的方式.如果为零，则将控件的ForeColor更改为白色.我添加了一个Enter事件，该事件将ForeColor更改为黑色，并删除了零.

I was using the NumericUpDown control without the spinners because I wanted only numbers. The control was in a child dialog that was invoked from a listview selection. When the value to be loaded into the NumericUpDown control was zero in the listwiew, a zero was in the control. That zero always had to be cleared out. Here's how I made it "appear" blank. If it was zero, I change the ForeColor of the control to white. I added an Enter event that changed the ForeColor to black and deleted the zero.

这隐藏了NumericUpDown控件微调器.

This hid the NumericUpDown control spinners.

AccessCode.Controls[0].Visible = false;

这些语句采用初始化形式. (将可变代码加载到AccessCode中)

These statements were in the form initialization. (var code was to be loaded into AccessCode)

        if (code == 0)
        {
            AccessCode.ForeColor = Color.White;
        }

Enter事件代码如下所示.

The Enter event code looked like this.

    private void AccessCode_Enter(object sender, EventArgs e)
    {
        if (AccessCode.ForeColor == Color.White)
        {
            AccessCode.ForeColor = Color.Black;
            AccessCode.Focus();
            SendKeys.SendWait("{Delete}");
        }
    }

AccessCode控件还具有一个Leave事件，用于检查有效数据.

The AccessCode control also had a Leave event that checked for valid data.

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