How to achieve multilabel form in c# winform?

Ken H

12y1.5kVisual Basic .NET

Hi all,

Detailed description of the problem as follows:

--SQL Server script:

CREATE TABLE forms_config

(

id int,

namespace_name varchar(50),

class_name varchar(50)

)

// C# codes:

namespace MulLableForms

{

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

public partial class Form1 : Form

{

public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
treeView1.Nodes.Add("Main Menu");
treeView1.Nodes[0].Nodes.Add("Submenu one");
treeView1.Nodes[0].Nodes[0].Nodes.Add("Form2");
treeView1.Nodes[0].Nodes[0].Nodes.Add("Form3");
treeView1.Nodes[0].Nodes[0].Nodes.Add("Form4");
treeView1.Nodes[0].Nodes.Add("Submenu two");
treeView1.Nodes[0].Nodes[1].Nodes.Add("Form5");
treeView1.Nodes[0].Nodes[1].Nodes.Add("Form6");
}
private void treeView1_DoubleClick(object sender, EventArgs e)
{
string formName = treeView1.SelectedNode.Text.Trim();
string queryFormConfig = @"select namespace_name,class_name from forms_config where class_name='" + formName+"'";
/*
Now,When I need to double-click the node to load the specified node form, and docked on the right side of the menu.
* When I double-click the node to continue, and continue to stop at the right of the menu. Thereby forming a multi-label style. It looks like SQL Server style.
* Description: use the reflective technology to dynamically load the specified form.
* Reflection parameters are stored in 'forms_config'.
* How to do this?
*/
}

}

Thanks.

8 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes12y ago
Accepted answer
I didn't follow some of that but the code to get the form data from the database and load it using reflection would be along these lines:

string formName = treeView1.SelectedNode.Text.Trim();
string queryFormConfig = @"select namespace_name,class_name from forms_config where class_name='" + formName+"'";

using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand command = new SqlCommand(queryFormConfig, connection);
connection.Open();
SqlDataReader reader = command.ExecuteReader();

if (reader.HasRows)
{
reader.Read())
string namespace = reader[namespace_name].ToString();
string className = reader[class_name].ToString();
string fullFormName = nameSpace + "." + className;
Type formType = Type.GetType(fullFormName);
if (formType != null)
{
Form f = (Form)Activator.CreateInstance(formType);
f.Show();
}
}
reader.Close();
}

+1
Ken H11y ago
Thank for you Vulpes :)
0
Vulpes11y ago
Adding a close button to a tab page is not so easy but check out this link:

http://www.dotnetthoughts.net/implementing-close-button-in-tab-pages/
+1
Ken H11y ago
Sorry, Vulpes, I was too late to come back to see your answer.
You are correct. Thank for your solution. :)

In addition,How to in each label embedded close icon?
It looks like this:

That would be more perfect.
0
Vulpes12y ago
Sorry to be so long in coming back on this.

Here's some code which adds a new TabPage to a TabControl for each reflection-created form. It doesn't allow you to add the same form more than once.

You'll need, of course, to make sure that the size of your forms and the size of the tab pages are compatible with each other:

private void Form1_Load(object sender, EventArgs e)
{
// start off with tabcontrol invisible
tabControl1.TabPages.Clear();
tabControl1.Visible = false;
}

private void treeView1_DoubleClick(object sender, EventArgs e)
{
string formName = treeView1.SelectedNode.Text.Trim();
string queryFormConfig = @"select namespace_name,class_name from forms_config where class_name='" + formName+"'";

using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand command = new SqlCommand(queryFormConfig, connection);
connection.Open();
SqlDataReader reader = command.ExecuteReader();

if (reader.HasRows)
{
reader.Read())
string nameSpace = reader[namespace_name].ToString();
string className = reader[class_name].ToString();
string fullFormName = nameSpace + "." + className;
Type formType = Type.GetType(fullFormName);
if (formType != null && !tabControl1.TabPages.ContainsKey(className))
{
Form f = (Form)Activator.CreateInstance(formType);
f.TopLevel = false;
TabPage tab = new TabPage(className);
tab.Name = className;
f.Parent = tab;
f.Dock = DockStyle.Fill;
f.Visible = true;
tabControl1.TabPages.Add(tab);
tabControl1.Visible = true;
tabControl1.SelectedTab = tab;
}
}

reader.Close();
}
}
0
Ken H12y ago
No, Vulpes,what I mean is: the reflections form add to the tabs.
Of course, your idea is very good.You can write a sample procedure?
thank for you.
0
Vulpes12y ago
Do you mean to do this instead of a TreeView i.e. create a TabControl which has tabs for each of the 6 possible forms and, then when one is selected, load the form using reflection?

If you do, then it would be better to use UserControls rather than Forms as it is much easier to embed the former in tab pages.

Can I also point out that, as you're using reflection, performance is not going to be great whatever you do. To improve matters, you could cache each Form or UserControl object as you create it so you don't have to create a new object of the same class each time it's selected.
0
Ken H12y ago
Hello Vulpes,

How to achieve the effect of tabs?
such as:each tab that represents a form.It looks like Microsoft SQL Server Managerment Studio style.

Renderings :

Thank for you.
0