为多个 TextBox 控件简化 TextChange 事件处理程序

Question

我只是想知道是否可以简化这些代码？我有多个文本框具有相同的 textchange 事件

    private void txtOvertimeHours_TextChanged(object sender, EventArgs e)
    {
        if (txtOvertimeHours.Text.Length <= 0 || 
            txtOvertimeHours.Text == null || 
            txtOvertimeHours.Text == "0.00" || 
            txtOvertimeHours.Text == "0" || 
            txtOvertimeHours.Text == "0.0")
        {
            txtOvertimeHours.Text = "0.00";
        }

    }

    private void txtAllowance_TextChanged(object sender, EventArgs e)
    {
        if (txtAllowance.Text.Length <= 0 ||
            txtAllowance.Text == null ||
            txtAllowance.Text == "0.00" ||
            txtAllowance.Text == "0" ||
            txtAllowance.Text == "0.0")
        {
            txtAllowance.Text = "0.00";
        }
    }

//等等

Answer 1

另一种方式。您可以对多个事件使用相同的事件处理程序：

private void ZeroOutTextBox_TextChanged(object sender, EventArgs e)
{
    TextBox txt = (TextBox) sender;

    if (txt.Text.Length <= 0 ||
        txt.Text == null ||
        txt.Text == "0.00" ||
        txt.Text == "0" ||
        txt.Text == "0.0")
    {
        txt.Text = "0.00";
    }
}

您可能还可以简化条件。下面的代码我没有测试过：

private void ZeroOutTextBox_TextChanged(object sender, EventArgs e)
{
    decimal result;
    TextBox txt = (TextBox) sender;

    if (String.IsNullOrWhitespace(txt.Text) ||
        (decimal.TryParse(txt.Text, out result) && result == 0M))
    {
        txt.Text = "0.00";
    }
}

Answer 2

private void txtOvertimeHours_TextChanged(object sender, EventArgs e)
{
    ZeroOutTextBox(txtOvertimeHours);
}

private void txtAllowance_TextChanged(object sender, EventArgs e)
{
    ZeroOutTextBox(txtAllowance);
}

private void ZeroOutTextBox(Textbox txt)
{
    if (txt.Text.Length <= 0 ||
        txt.Text == null ||
        txt.Text == "0.00" ||
        txt.Text == "0" ||
        txt.Text == "0.0")
    {
        txt.Text = "0.00";
    }
}