Question

关于C#中的选项卡的问题 tabcontrol

我做了一个窗体From1，然后这个窗体上面有两个按钮，一个是Btn_A，一个是Btn_B，然后我又做了另外一个窗体From2，在上面做了一个选项卡，选项卡里有两个tabPage，一个是tabPage1，一个是tabPage2。然后我现在想让它点击From1中的Btn_A时，打开From2，并且显示在tabPage1，然后点击From1的Btn_B时，打开From2，并且显示在tabPage2上，这应该怎么做呢？最好能详细点。
帮忙回答下啊

Answer 1

//这是MainForm类:
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

namespace testWinForm
{
/// <summary>
/// Description of MainForm.
/// </summary>
public partial class MainForm : Form
{
public MainForm()
{
//
// The InitializeComponent() call is required for Windows Forms designer support.
//
InitializeComponent();

//
// TODO: Add constructor code after the InitializeComponent() call.
//
}

void BtnAClick(object sender, EventArgs e)
{
Form2 frm2=new Form2(0);
frm2.ShowDialog();
}

void BtnBClick(object sender, EventArgs e)
{
Form2 frm2=new Form2(1);
frm2.ShowDialog();
}
}
}

============下面是Form2类=================
using System;
using System.Drawing;
using System.Windows.Forms;

namespace testWinForm
{
/// <summary>
/// Description of Form2.
/// </summary>
public partial class Form2 : Form
{
public Form2(int index)
{
//
// The InitializeComponent() call is required for Windows Forms designer support.
//
InitializeComponent();

//
// TODO: Add constructor code after the InitializeComponent() call.
//

if(index >= 0 && index < tabControl1.TabPages.Count)
{
tabControl1.SelectedIndex=index;
}
}
}
}

==========================================
如果不想每次都新建一个Form2的实例，可以在MainForm类中添加一个字段（成员变量），字段类型为Form2，然后为Form2添加一个public 方法来更改选取哪一页。
================下面是修改后的MainForm类==============
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

namespace testWinForm
{
/// <summary>
/// Description of MainForm.
/// </summary>
public partial class MainForm : Form
{
public MainForm()
{
//
// The InitializeComponent() call is required for Windows Forms designer support.
//
InitializeComponent();

//
// TODO: Add constructor code after the InitializeComponent() call.
//
}

private Form2 frm2;

void BtnAClick(object sender, EventArgs e)
{
if(frm2==null)frm2=new Form2(0);

frm2.SelectTabPage(0);
frm2.ShowDialog();
}

void BtnBClick(object sender, EventArgs e)
{
if(frm2==null)frm2=new Form2(0);

frm2.SelectTabPage(1);
frm2.ShowDialog();
}
}
}

===========下面是修改后的Form2类==================
using System;
using System.Drawing;
using System.Windows.Forms;

namespace testWinForm
{
/// <summary>
/// Description of Form2.
/// </summary>
public partial class Form2 : Form
{
public Form2(int index)
{
//
// The InitializeComponent() call is required for Windows Forms designer support.
//
InitializeComponent();

//
// TODO: Add constructor code after the InitializeComponent() call.
//

if(index >= 0 && index < tabControl1.TabPages.Count)
{
tabControl1.SelectedIndex=index;
}
}

public void SelectTabPage(int index)
{
if(index >= 0 && index < tabControl1.TabPages.Count)
{
this.tabControl1.SelectedIndex=index;
}
}
}
}