当我按取消按钮时，在form2中显示消息框 [英] Showing message box in form2 when i press the cancel button

问题描述

我有三种形式的Winform应用程序。在哪个form3中，有两个按钮和一些文本框。我想让
知道为什么当我按下表单的取消按钮时，表单显示一个名为 Duplicate的消息弹出窗口。
我实际上告诉form3取消并返回到form1。它的工作。但是在进入form1
之前，它向我显示了一个我不想看到的消息框 Duplicate。我如何避免此弹出窗口。请指导我
谢谢我提前

I have got three forms, of a winform app. in which form3 there are two butons and some textboxes. I wanted to know why my form is showing a messagepop called "Duplicate" when i press the cancel button of the form. I actually told the form3 to cancel and return to the form1. Its doing the job. but before coming to the form1 its showing me a messagebox "Duplicate" which i dont want to see. How can i avoid this popup. Please guide me Thanks i advance

form3中的代码

   private void submit_Click(object sender, EventArgs e)
    {

        // this button click event handler will raise the 
        // event which can then intercepted by any listeners
    //some codes....
        this.Dispose();
    }

private void cancel_Click(object sender, EventArgs e)
    {
        this.Close();
    }

form1中的代码

private void btn_open_form3_Click(object sender, EventArgs e)
    {
        Form3 f = new Form3();
        string l = "true";
        // Add an event handler to update this form
        // when the address form is updated (when AddressUpdated fires).
        f.AddressUpdated += new Form3.AddressUpdateHandler(AddressForm_ButtonClicked);

        f.ShowDialog();
        if (String.IsNullOrEmpty(file_NameTextBox.Text.ToString()))
        {
            frmShowMessage.Show("Try again!!!", "Missing!!!!", enumMessageIcon.Error, enumMessageButton.OK);
            //cell_check();
        }
        else
        {
            if (checkexistornot())
            {
                if (file_NameTextBox.Text == string.Empty)
                {
                    cell_check();
                }

                else
                {
                    SqlConnection con = new SqlConnection(@"Data Source=DVSQL\SQLEXPRESS;Initial Catalog=CncDB;Persist Security Info=True;User ID=CncDbUser;Password=*****");
                    con.Open();
                    SqlCommand cmd = new SqlCommand(@"INSERT INTO cncinfo (part,drawings,draftpath,comments) VALUES ('" + file_NameTextBox.Text + "','" + drawingsTextBox.Text + "','" + gcodeTextBox.Text + "','" + commentsTextBox.Text + "') ", con);
                    cmd.ExecuteNonQuery();
                    con.Close();
                    load_table();
                }
            }
        }
    }

    private void AddressForm_ButtonClicked(object sender, AddressUpdateEventArgs e)
    {
        // update the forms values from the event args
        file_NameTextBox.Text = e.File_Name;
        drawingsTextBox.Text = e.Drawings;
        gcodeTextBox.Text = e.Gcode;
        commentsTextBox.Text = e.Comments;
    }

    public bool checkexistornot()
    {
        SqlConnection con = new SqlConnection(@"Data Source=DVSQL\SQLEXPRESS;Initial Catalog=CncDB;User ID=CncDbUser;password=*****");
        con.Open();
        SqlCommand cmd = new SqlCommand("select part from cncinfo where part='" + this.file_NameTextBox.Text + "'  ;", con);
        cmd.CommandType = CommandType.Text;
        cmd.Parameters.Add("@part", SqlDbType.NVarChar).Value = Convert.ToString(dataGridView1.Rows[0].Cells["Part Number"].Value);
        object obj = cmd.ExecuteScalar();
        cmd.ExecuteNonQuery();
        con.Close();
        if (obj!=null)
        {
            frmShowMessage.Show(""Duplicate!!!!", enumMessageIcon.Warning, enumMessageButton.OK);//- - - ->>showing this line if i press the cancel_Click from FORM3
            cell_check();
            return false;
        }
        else  
            return true;
    }

推荐答案

如果您希望代码在单击在Form3中单击取消按钮，一个选项是利用DialogResult属性。

If you want your code to not execute code after clicking the cancel button in Form3, one option is taking advantage of the DialogResult property.

取消按钮单击处理程序：

private void cancel_Click(object sender, EventArgs e)
{
    this.DialogResult = DialogResult.Cancel;
    this.Close();
}

在显示Form3之后立即显示（ f.ShowDialog（ ）;）

if (f.DialogResult == DialogResult.Cancel)
{
    return;
}

希望有帮助。

这篇关于当我按取消按钮时，在form2中显示消息框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！