How to Show Tab page which is already open

Question

4.00/5 (1 vote)

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I got a windows form with Datagridview including Employee information. when i select say one Row from dridvie and Click on New Button it loads a new Tabcontrol which Title employee name.

I have implemented so every time user select one row from grid view and click on new Button it adds new tab control with name of Tabpage employee name. when employee already exists it do now open Particular tab which already Opens thats how i want and it works perfectly fine.

But when i select a row from gridview Employee which Tab is already open and click on new it doesnt open new tab which is ok but if it is already open every time i click new i want to go inside that Tab page How to do it???

Here is my code

SQL

private void button_New_Click(object sender, EventArgs e) 
{ 
TabPage tpEmployee = new TabPage(emp.Vorname);
tpEmployee.Tag = emp.ID;
            GUI.Ucemp ucempTes = new GUI.UCemp();
             Ucemptest.Employee = emp;
             Ucemptest.Dock = DockStyle.Fill;
            tpEmployee.Controls.Add(ucempTes);

            Boolean found = false;


            foreach (TabPage tp in tabControl.TabPages)
            {
                if (tp.Tag != null && tp.Tag.Equals(tpEmployee.Tag))
                {
                    found = true;
                 //Here i want to go inside Tab which is already open
                 //i also tried
                 //tabControl.SelectedTab = tpEmployee;
                // But it is blank
               }
            }

            if (!found)
            {

                this.tabControl.TabPages.Add(tpEmployee);
                tabControl.SelectedTab = tpEmployee;


            }

Posted 20-Nov-14 21:50pm

Member 11000455

Updated 20-Nov-14 22:29pm

v3

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2 solutions

Solution 1

C#

foreach (TabPage tabpage in tabControl.TabPages)
                {
                    
                    if (tabpage.Tag != null && tabpage.Tag.Equals(tpBewerber1.Tag))
                    {
              
                      
                       int index = tabControl.TabPages.IndexOf(tpEmp);
                         //index is always 0 but i got 3 tabpages
                         tabControl.SelectedTab = tpBewerber1;
                      }

Posted 20-Nov-14 22:34pm

Member 11000455

Updated 20-Nov-14 22:53pm

v2

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BillWoodruff · Accepted Answer · 2014-11-20T22:47:00

This is based on the idea that you should only create a new object (TabPage) when you require one:

C#

private void button_New_Click(object sender, EventArgs e) 
{ 
    foreach (TabPage tp in tabControl.TabPages)
    {
        if (tp.Tag != null && tp.Tag.Equals(tpEmployee.Tag))
        {
            //Here i want to go inside Tab which is already open
            
            tabControl.SelectedTab = tp;
            tp.Focus();
            
            // ? set Focus on a Control you have a reference to inside the TabPage
            // tp.Controls["ucempTes"].Focus();
    
            // done
            return;    
       }
    }
    
    TabPage tpEmployee = new TabPage(emp.Vorname);
    tpEmployee.Tag = emp.ID;
    GUI.Ucemp ucempTes = new GUI.UCemp();
    Ucemptest.Employee = emp;
    Ucemptest.Dock = DockStyle.Fill;
    tpEmployee.Controls.Add(ucempTes);
}

If you can get a reference to the 'ucempTes inside the TabPage, and you want to set force Focus to a Control inside the 'ucempTes, like a TextBox:

C#

tp.Controls["ucempTes"].Controls["textBox1"].Focus();
tp.Controls["ucempTes"].Controls["textBox1"].Capture = true;

This tedious repetition of dot-notation access can be eliminated by creating a Dictionary mapping the object you wish to focus on in each TabPage to the DataGridView rows.