C# Windows 窗体:遍历动态创建的文本框并检查文本是否已更改



我正在尝试创建各种图形SQL编辑器 - 但我不喜欢表格的视觉效果,并试图添加更多的交互性(拖放等)。

我已经浏览并基于每条记录创建了面板,并根据表中的每条记录向每个面板添加了文本框。我现在坚持的是循环浏览动态创建的控件并检查其状态或与它们交互的概念。

如果您发现我如何构建此问题,请告诉我。

我的代码如下:

生成面板的代码:

  private void comboBox1_SelectedIndexChanged_1(object sender, EventArgs e)
    {
        groupBox1.Controls.Clear();
        string pDBString = null;
        SqlConnection cnn;
        pDBString = "Data Source=localhost\" + Form1.host + ";Initial Catalog=" + Form1.db + ";Integrated Security=SSPI;";
        cnn = new SqlConnection(pDBString);
        string sqlForProps = "select * from PROPS where user_id_txt ='" + comboBox1.SelectedItem.ToString() + "'";
        try
        {
            using (cnn)
            {
                cnn.Open();
                SqlCommand cmd = new SqlCommand(sqlForProps, cnn);
                SqlDataReader sqlReader = cmd.ExecuteReader();
                int x = 0;
                int count = 0;
                while (sqlReader.Read())
                {
                    Panel panel = new System.Windows.Forms.Panel();
                    panel.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
                    x += 30;
                    panel.Location = new System.Drawing.Point(3, x);
                    panel.Name = "panel" + count;
                    panel.Size = new System.Drawing.Size(519, 30);
                    panel.TabIndex = 3;
                    PropsPanels.Add(panel);
                    groupBox1.Controls.Add(panel);
                    TextBox textbox = new System.Windows.Forms.TextBox();
                    panel.Controls.Add(textbox);
                    textbox.Location = new System.Drawing.Point(1, 3);
                    textbox.Name = "textBox" + count;
                    textbox.Size = new System.Drawing.Size(100, 20);
                    textbox.TabIndex = 4;
                    textbox.Text = sqlReader["USER_ID_TXT"].ToString();
                    TextBox textboxAM = new System.Windows.Forms.TextBox();
                        panel.Controls.Add(textboxAM);
                        textboxAM.Location = new System.Drawing.Point(126, 3);
                        textboxAM.Name = "textBoxAM" + count;
                        textboxAM.Size = new System.Drawing.Size(100, 20);
                        textboxAM.TabIndex = 4;
                        textboxAM.Text = sqlReader["PROP_TXT"].ToString();
                    TextBox textboxAMSet = new System.Windows.Forms.TextBox();
                        panel.Controls.Add(textboxAMSet);
                        textboxAMSet.Location = new System.Drawing.Point(232, 3);
                        textboxAMSet.Name = "textBoxAM" + count;
                        textboxAMSet.Size = new System.Drawing.Size(100, 20);
                        textboxAMSet.TabIndex = 4;
                        textboxAMSet.Text = sqlReader["VAL_TXT"].ToString();
                    count++;
                }
                sqlReader.Close();
                cnn.Close();
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Can not open connection !");
        }
    }

假定要检查面板的代码:

        public AMMain()
    {
        InitializeComponent();
        string pDBString = null;
        SqlConnection cnn;
        pDBString = "Data Source=US7-AHACKETT\SQLEXPRESS;Initial Catalog=OrchestroConfigurationDB;Integrated Security=SSPI;";
        MessageBox.Show(pDBString);
        cnn = new SqlConnection(pDBString);
        try
        {
            using (cnn)
            {
                SqlCommand sqlForUserList = new SqlCommand("select UserName from users a join Company b on a.CompanyID = b.CompanyID where CompanyCode='" + Form1.company + "'", cnn);
                cnn.Open();
                MessageBox.Show("Connection Open !");
                SqlDataReader sqlReader = sqlForUserList.ExecuteReader();
                while (sqlReader.Read())
                {
                    comboBox1.Items.Add(sqlReader["UserName"].ToString());
                }
                sqlReader.Close();
                cnn.Close();
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Can not open connection !");
        }
        foreach (Panel p in PropsPanels)
        {
            foreach (Control c in p.Controls)
            {
                if(c is TextBox)
                {
                    object sender = new object();
                    EventArgs e = new EventArgs();
                    if(c.TextChanged()??????)
                    {
                     //DOSOMETHING   
                    }
                }
            }
        }
    }

例如:如果我想检查我放在表单上的文本框的文本是否发生了变化,我会这样做:

        private void textBox1_TextChanged(object sender, EventArgs e)
    {
    }

所以我想我无法弄清楚如何在运行时检查这一点,因为我是在运行时创建文本框。

感谢您的任何帮助!

例如:如果我想检查文本框的文本是否发生了变化,我 放在我会这样做的表格上:

private void textBox1_TextChanged(object sender, EventArgs e)
{
}

所以我想我无法弄清楚我将如何检查这一点 运行时,因为我在运行时创建文本框。

你也一样!

首先创建一个处理事件的方法:

private void TextBoxTextChanged(object sender, EventArgs e) {
    // you can use the sender argument to check exactly which text box's text changed
}

初始化表单时,请执行以下操作:

textbox.TextChanged += TextBoxTextChanged;
textboxAM.TextChanged += TextBoxTextChanged;
textboxAMSet.TextChanged += TextBoxTextChanged;

您可以像手动将文本框放到位一样执行此操作。 你只需要订阅每个新TextBoxTextChanged事件。

var x = new TextBox();
x.TextChanged += textBox1_TextChanged;

在旧版本的 .Net 中,可能需要指定委托。有关详细信息,请参阅 MSDN 有关此主题的信息。

创建控件时,需要在TextChanged委托上注册。

TextBox textbox = new System.Windows.Forms.TextBox();
panel.Controls.Add(textbox);
textbox.Location = new System.Drawing.Point(1, 3);
textbox.Name = "textBox" + count;
textbox.TextChanged += TextBox_TextChanged

然后,在事件处理程序中,使用 sender 参数强制转换为触发事件的控件实例。

  private void(object sender, EventArgs e)
    {
        //get name of textbox
        var tb = (TextBox) sender;
        // do whatever with text box
    }

相关内容

  • 没有找到相关文章

最新更新