使用C#中的TextBox验证事件

时间:2017-02-01 11:10:53

标签: c# winforms datagridview

所以,我有2个表格。主要内容为TextBox,如果按F1,则会根据DataGridView上的插入值打开一个TextBox的新表单。双击第二个表单中的该行后,它将再次显示主表单并填充TextBox所选行。

然后,在主窗体中,我在TextBox上有一个验证事件,它将能够根据该值在主窗体DataGridView中显示它。

不幸的是它没有用,我认为问题来自其他组件的CauseValidation。我使用例如dataGridView1.CauseValidation = false;禁用它,但仍然相同。

这是TextBox事件的代码:

    private void txtCargs_Validating(object sender, CancelEventArgs e)
    {
        e.Cancel = false;
        try
        {
            SqlConnection con = new SqlConnection(cs.DBConnP);
            con.Open();

            string querySelect = @"SELECT RTRIM(CL.Cargs) AS 'Cargs', RTRIM(S.Abvs) AS 'Abss',  RTRIM(CL.Linha) AS 'Linha', RTRIM(CL.Qtd) AS 'Quantity'
                                    FROM CargaCab CC (NOLOCK)
                                    INNER JOIN CargsLin CL (NOLOCK) ON CC.Cargs = CL.Cargs
                                    INNER JOIN Stock S (NOLOCK) ON CL.Code = S.Code 
                                    INNER JOIN Marks M (NOLOCK) ON S.Marks = M.Marks
                                    WHERE CC.Date >= GETDATE() - 120 AND CL.State NOT IN ('F', 'A') AND S.TypeEmb = 'P' 
                                    AND CC.TypeD = 'OCS' AND CL.Cargs = '" + txtCargs.Text.Trim() + "' ORDER BY CL.Carga, S.Marks DESC, S.Abvs";
            cmd = new SqlCommand(querySelect);
            cmd.Connection = con;

            SqlDataAdapter da = new SqlDataAdapter(cmd);

            DataSet ds = new DataSet();
            da.Fill(ds, "CargaCab");

            dataGridView1.DataSource = ds.Tables["CargaCabee"].DefaultView;

            dataGridView1.Columns[0].ReadOnly = true;
            dataGridView1.Columns[1].ReadOnly = true;
            dataGridView1.Columns[2].ReadOnly = true;
            dataGridView1.Columns[3].ReadOnly = false;

            con.Close();
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error\nDetalhes: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }

我该怎么办?

4 个答案:

答案 0 :(得分:1)

短期

不要将所有逻辑放在txtCargs_Validating事件中,而是创建第二个表单在关闭时调用的方法。您可以通过将第1个表单的实例传递给第2个来完成此操作,例如,

public class SecondForm : Form {

  private Form _1stForm;
  public SecondForm(Form 1stForm)
  {
    _1stForm = 1stForm;
  }

...

public SecondForm_Closing(object sender, EventArgs e)
{
_1stForm.SetTheTextBox(theRowValueSelected);
}

从主表单中调用代码:

var frm = new SecondForm(this);
frm.Show();

长期

更好的解决方案是将所有代码放在业务逻辑层(如MVC中的Controller,或MVVM中的ModelView)中,并将 BIND 所有UI控件放到业务中的数据结构中逻辑层。

无论哪种方式保存验证事件以进行验证,例如:

 MessageBox.Show("Error\nDetalhes: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

答案 1 :(得分:0)

我建议,使用bool返回类型将此事件设为自定义函数。在文本框中使用text_changed事件,然后调用Validate函数。我已经尝试过示例Textbox_Validating事件,并在表单关闭时调用它。

答案 2 :(得分:0)

 private void txtCargs_TextChanged(object sender, EventArgs e)
        {
            if (ValidateText())
            {
                //Then do this
            }
        }

        private bool ValidateText()
        {
            bool Isvalidated = false;

            try
            {
                SqlConnection con = new SqlConnection(cs.DBConnP);
                con.Open();

                string querySelect = @"SELECT RTRIM(CL.Cargs) AS 'Cargs', RTRIM(S.Abvs) AS 'Abss',  RTRIM(CL.Linha) AS 'Linha', RTRIM(CL.Qtd) AS 'Quantity'
                                    FROM CargaCab CC (NOLOCK)
                                    INNER JOIN CargsLin CL (NOLOCK) ON CC.Cargs = CL.Cargs
                                    INNER JOIN Stock S (NOLOCK) ON CL.Code = S.Code 
                                    INNER JOIN Marks M (NOLOCK) ON S.Marks = M.Marks
                                    WHERE CC.Date >= GETDATE() - 120 AND CL.State NOT IN ('F', 'A') AND S.TypeEmb = 'P' 
                                    AND CC.TypeD = 'OCS' AND CL.Cargs = '" + txtCargs.Text.Trim() + "' ORDER BY CL.Carga, S.Marks DESC, S.Abvs";
                cmd = new SqlCommand(querySelect);
                cmd.Connection = con;

                SqlDataAdapter da = new SqlDataAdapter(cmd);

                DataSet ds = new DataSet();
                da.Fill(ds, "CargaCab");

                dataGridView1.DataSource = ds.Tables["CargaCabee"].DefaultView;

                dataGridView1.Columns[0].ReadOnly = true;
                dataGridView1.Columns[1].ReadOnly = true;
                dataGridView1.Columns[2].ReadOnly = true;
                dataGridView1.Columns[3].ReadOnly = false;

                con.Close();
                Isvalidated = true;
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error\nDetalhes: " + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                Isvalidated = false;
            }

            return Isvalidated;
        }

答案 3 :(得分:0)

我认为问题在于您需要修复解决方案,而不是解决问题。

以下是我认为可以实现这一目标的快速草图:

public class Form1 : Form
{
    public TextBox textBox1 { get; set; }

    public Button button1 { get; set; }

    private void button1_Click(object sender, EventArgs e)
    {
        var form = new Form2();
        form.Show();
        textBox1.Text = form.val;
        //do your sql stuff here
    }
}

public class Form2 : Form
{
    public DataGridView datagriview1 { get; set; }

    public string val { get; set; }

    private void datagriview1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
    {
        if (e.RowIndex > -1)
            val = datagriview1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();
        Close();
    }
}