Question

因此，我将尝试解释我希望我的应用程序执行的操作：

1）在主表格中，我有TextBox和DataGridView。我将在TextBox中插入要搜索的内容，然后点击F1以打开第二个表单，该表单将显示在另一个DataGridView中。

2）我将双击第二个表格DataGridView，该列值将显示在主表单的TextBox中。

3）之后，TextBox被填充，并且根据该值，它将插入到详细值的主要表单DataGridView中。

在第二个表单 DataGridView中，我有双击事件：

private void dataGridView1_RowHeaderMouseDoubleClick(object sender, DataGridViewCellMouseEventArgs e)
{
    try
    {
        DataGridViewRow dr = dataGridView1.SelectedRows[0];
        this.Hide();

        frmPrincipal frm = new frmPrincipal();

        frm.Show();

        frm.txtCarga.Text = dr.Cells[0].Value.ToString();

        frm.txtCarga.Focus();
        frm.txtCarga.SelectAll();

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

这是我在主要表格中打电话给第二张表格的时候：

private void txtCarga_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.F1)
            {
                this.Hide();
                frmPesquisa frmP = new frmPesquisa();
                frmP.Show();
                con = new SqlConnection(cs.DBConnP);
                con.Open();

                string querySelect = @"SELECT CL.Cargs
                                    FROM CargsCab CC (NOLOCK)
                                    INNER JOIN CargsLin CL (NOLOCK) ON CC.Cargs = CL.Cargs
                                    INNER JOIN Stock S (NOLOCK) ON CL.Code = S.Code
                                    WHERE CC.Date >= GETDATE() - 120 AND CL.State NOT IN ('F', 'A') AND S.Type = 'P' 
                                    AND CC.TypeB = 'OCS' AND CL.Cargs LIKE '%" + txtCargs.Text + "%' GROUP BY CL.Cargs ORDER BY CL.Cargs DESC";
                cmd = new SqlCommand(querySelect);
                cmd.Connection = con;
                cmd.Parameters.Add(new SqlParameter("@Cargs", SqlDbType.NChar, 20, "CL.Cargs"));
                cmd.Parameters["@Cargs"].Value = txtCargs.Text;
                SqlDataAdapter da = new SqlDataAdapter(cmd);

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

                frmP.dataGridView1.DataSource = ds.Tables["CargsCab"].DefaultView;

                txtCarga.SelectAll();

                con.Close();
            }

        }

这里的问题是，如果我使用frm.Show();，它将打开一个新的frmPrincipal表单，但我已经有了。如果我评论frm.Show();代码将不会执行，但不会显示错误。基本上该值不会显示在TextBox。

中

我该怎么办？

Answer 1

我已根据您的新修改更新了我的答案

public class frmPrincipal
{
    // ....
    // rest of your form Code

    private void txtCarga_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyCode == Keys.F1)
        {
            this.Hide();
            frmPesquisa frmP = new frmPesquisa(this); // Pass a reference to this form
            frmP.Show();
            con = new SqlConnection(cs.DBConnP);
            con.Open();

            string querySelect = @"SELECT CL.Cargs
                                FROM CargsCab CC (NOLOCK)
                                INNER JOIN CargsLin CL (NOLOCK) ON CC.Cargs = CL.Cargs
                                INNER JOIN Stock S (NOLOCK) ON CL.Code = S.Code
                                WHERE CC.Date >= GETDATE() - 120 AND CL.State NOT IN ('F', 'A') AND S.Type = 'P' 
                                AND CC.TypeB = 'OCS' AND CL.Cargs LIKE '%" + txtCargs.Text + "%' GROUP BY CL.Cargs ORDER BY CL.Cargs DESC";
            cmd = new SqlCommand(querySelect);
            cmd.Connection = con;
            cmd.Parameters.Add(new SqlParameter("@Cargs", SqlDbType.NChar, 20, "CL.Cargs"));
            cmd.Parameters["@Cargs"].Value = txtCargs.Text;
            SqlDataAdapter da = new SqlDataAdapter(cmd);

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

            frmP.dataGridView1.DataSource = ds.Tables["CargsCab"].DefaultView;

            txtCarga.SelectAll();

            con.Close();
        }
    }
}

public class frmPesquisa
{
    private frmPrincipal frmP;

    public frmPesquisa()
    {
        InitializeComponent(); // Default constructor
    }

    public frmPesquisa(frmPrincipal frmP) : this()
    {
        this.frmP = frmP;
    }

    private void dataGridView1_RowHeaderMouseDoubleClick(object sender, DataGridViewCellMouseEventArgs e)
    {
        try
        {
            DataGridViewRow dr = dataGridView1.SelectedRows[0];
            this.Hide();

            // If we have a reference to the main form, then show it
            // and set the txtCarga text
            if (this.frmP != null && !this.frmP.IsDiposed)
            {
                frmP.Show();

                frmP.txtCarga.Text = dr.Cells[0].Value.ToString();

                frmP.txtCarga.Focus();
                frmP.txtCarga.SelectAll();
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Erro\nDetalhes: " + ex.Message, "Erro", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }
}

双击C＃中的DataGridView后重复的表单

1 个答案: