Question

我很难确定我在这里做错了什么。我的逻辑是只有在文本框发生变化时才运行存储过程（UpdateRate）。如果文本框中没有更改，只需跳过该行信息的存储过程并转到下一个。

有人可以帮我解决这个问题吗？我尝试了一切。请记住，我是新手，可能无法完全理解复杂的答案。

C＃：

public partial class MainWindow : 
{
    internal static string oldAvgRate;
    internal static string oldOTRate;
    internal static string ratetype;
    internal static string rtOT;

    public MainWindow()
    {
        InitializeComponent();

        string connectionString = "datasource=;port=;username=;password=";
        string sDate = DateTime.Now.ToString("yyyy-MM-dd");
        MySqlConnection connection = new MySqlConnection(connectionString);

        MySqlCommand avgRate = new MySqlCommand("Select ID, DateFrom, DateTo, RateType, Amount, Description from Daily.Rates where RateType = 'Average Hourly Wages' and DateTo >= @sDate", connection);
        avgRate.Parameters.Add(new MySqlParameter("sDate", sDate));

        MySqlCommand otRate = new MySqlCommand("Select ID, DateFrom, DateTo, RateType, Amount, Description from Daily.Rates where RateType = 'Average OT Hourly Wages' and DateTo >= @sDate", connection);
        otRate.Parameters.Add(new MySqlParameter("sDate", sDate));

        try
        {
            connection.Open();

            MySqlDataReader AvgR = avgRate.ExecuteReader();

            while (AvgR.Read())
            {
                txtAHW.Text = AvgR["Amount"].ToString(); 
                dfAHW.Text = AvgR["DateFrom"].ToString();
                dtAHW.Text = AvgR["DateTo"].ToString();
                txtcommAHW.Text = AvgR["Description"].ToString();

                oldAvgRate = txtAHW.Text = AvgR["Amount"].ToString();
                ratetype = AvgR["RateType"].ToString();
            }

            AvgR.Close();
            AvgR.Dispose();

            MySqlDataReader OtR = otRate.ExecuteReader();

            while (OtR.Read())
            {
                txtOTHW.Text = OtR["Amount"].ToString();
                dfOTHW.Text = OtR["DateFrom"].ToString();
                dtOTHW.Text = OtR["DateTo"].ToString();
                txtcommOTHW.Text = OtR["Description"].ToString();

                oldOTRate = txtOTHW.Text = OtR["Amount"].ToString();
                rtOT = OtR["RateType"].ToString();
            }   

            OtR.Close();
            OtR.Dispose();
        }

        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

        connection.Close();
    }

        private string UpdateRate(string dateFrom, string newRate, string oldRate, string ratetype, string description)
        {
            string connectionString = "datasource=;port=;Initial Catalog='';username=;password=";
            MySqlConnection connection = new MySqlConnection(connectionString);

            try
            {
                connection.Open();

                MySqlCommand cmd = new MySqlCommand("UpdateRate", connection);
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.Add("@p_DateFrom", MySqlDbType.Date).Value = dateFrom;
                cmd.Parameters.Add("@p_NewAmount", MySqlDbType.Decimal).Value = newRate;
                cmd.Parameters.Add("@p_OldAmount", MySqlDbType.Decimal).Value = oldRate;
                cmd.Parameters.Add("@p_RateType", MySqlDbType.VarChar).Value = ratetype;
                cmd.Parameters.Add("@p_Description", MySqlDbType.VarChar).Value = description;

                cmd.ExecuteNonQuery();              
                connection.Close();
                return newRate;            
            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            return null;
        }

        private bool txtAHWHasChangedFlag;
        private bool txtOTHWHasChangedFlag;

        private void textChangedEventHandler(object sender, TextChangedEventArgs args)
        {        
            var control = sender as TextBox;

            if (control.Name == "txtAHW" )
                txtAHWHasChangedFlag = true;
            else if (control.Name == "txtOTHW")
                txtOTHWHasChangedFlag = true;
        }

        private void btnSave_Click(object sender, RoutedEventArgs e)
        {
            if (txtAHWHasChangedFlag) //True regardless if changes are made in the textbox or not :(
            {
            oldAvgRate = UpdateRate(dfAHW.SelectedDate.Value.ToString("yyyy-MM-dd"), txtAHW.Text, oldAvgRate, ratetype, txtcommAHW.Text);
            MessageBox.Show("Done", "Test", MessageBoxButton.OK);
            }

            if (txtOTHWHasChangedFlag) //True regardless if changes are made in the textbox or not :(
            {
            oldOTRate = UpdateRate(dfOTHW.SelectedDate.Value.ToString("yyyy-MM-dd"), txtOTHW.Text, oldOTRate, rtOT, txtcommOTHW.Text);
            MessageBox.Show("Done", "Test", MessageBoxButton.OK);
            }

            if (!txtAHWHasChangedFlag && !txtOTHWHasChangedFlag)
            {    
            MessageBox.Show("Nothing has changed", "Test", MessageBoxButton.OK);
            return;
            }
        }
}

XAML：

<TextBox x:Name="txtAHW" TextChanged="textChangedEventHandler"/>
<TextBox x:Name="txtOTHW" TextChanged="textChangedEventHandler"/>

我在if语句的btnSave_Click里面设置了2个断点，启动了解决方案，更改了其中一个文本框，并注意到无论我做什么，这两个语句都会产生True。即使我停用了我的文本框并单击了保存按钮，我仍然会True而不是False。当我尝试调试时，我注意到TextChangedEvent上的以下错误，对于我更改的其中一个文本框：

我真的很感激任何建议。谢谢！

根据@ user2107843回答尝试。它解决了我的初始问题，但是当我第二次点击保存时，它会运行两个存储过程而不是仅更改的存储过程。因此，如果我更改txtAHW然后单击“保存”，它可以工作，它只运行txtAHW的存储过程。如果在此之后我也改变txtOHW，则存储过程运行两者而不是仅运行txtOHW。我的逻辑是txtAHW已经保存，所以不需要再次运行。有些人可以帮助我改善这个：

private void textChangedEventHandler(object sender, TextChangedEventArgs args)
{        
    var control = sender as TextBox;

    if (control.Name == "txtAHW")

        if (oldAvgRate != txtAHW.Text && oldAvgRate != null)
            txtAHWHasChangedFlag = true;
        else
            txtAHWHasChangedFlag = false;
    else if (control.Name == "txtOTHW")
        if (oldOTRate != txtOTHW.Text && oldOTRate != null)
            txtOTHWHasChangedFlag = true;
        else
            txtOTHWHasChangedFlag = false;
}

Answer 1

你应该在textChangedEventHandler

中伪造

private void textChangedEventHandler(object sender, TextChangedEventArgs args)
        {        
            var control = sender as TextBox;

            if (control.Name == "txtAHW" )

                if(oldAvgRate != txtAHW.Text && oldAvgRate !=null)
                   txtAHWHasChangedFlag = true;
                 else
                   txtAHWHasChangedFlag = false
            else if (control.Name == "txtOTHW")
                txtOTHWHasChangedFlag = true;
        }

文本框更改时不会触发TextChangedEvent

1 个答案: