我有三种形式(Form 1中,窗口2,form3),我的主要形式是Form1上,从我打开窗口2服用一些数据,我有窗口2,将带我去form3更新按钮,现在我想,无论用户在form3写更新为窗口2,我怎样才能使人们有可能使用C#.NET?
I have three forms(form1,form2,form3), my main form is form1, from that i opened form2 taking some data and i have an update button on form2 that will take me to form3, now i want that whatever user writes on form3 is updated to form2, how can i make it possible using c#.net?
(我使用的ShowDialog()方法中打开的窗口2,form3)
(i opened form2,form3 using showdialog() method)
//reference to form2
Form2 SecondaryForm = new Form2(mainForm);<br/>
SecondaryForm.ShowDialog();
//in the constructor of Form2 save the reference of Form1
Form1 form1 = null
Form2(Form1 mainForm)
{
form1 = mainForm;
}
//then instead of creating a new MainForm again just use reference of Form1
form1.updateText(data);
this.Close()
我已经使用了超过code,但我是越来越nullreference异常 form1.updateText(数据);
推荐答案
只是通过形式2参照形成三个在实例它。同样像你一样为Form1,同时打开窗口2。然后从form3使用窗口2引用调用UPDATETEXT这应该是对窗口2的公共方法方法
Just pass the form 2 reference to form three while instantiating it.. similarly as you did for form1 while opening form2. then from form3 use the form2 reference to call updatetext method which should be a public method on form2
下面是code所有3种形式,您可以更新任何形式从别人,我已经说得那么您可以访问Form 1和Form中form3。
here is code for all 3 forms, you can update any form from others, i have made it so that you can access form1 and form2 in form3.
using System;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form2 frm2;
public Form3 frm3;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
public void updateText()
{
this.textBox1.Text = "";
}
private void button1_Click(object sender, EventArgs e)
{
if (frm2 == null)
frm2 = new Form2(this);
frm2.ShowDialog();
}
}
}
using System;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form2 : Form
{
public Form1 refToForm1;
public Form2(Form1 f1)
{
refToForm1 = f1;
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
if (refToForm1.frm3 == null)
refToForm1.frm3 = new Form3(this);
refToForm1.frm3.ShowDialog();
}
public void UpdateForm2(string txt)
{
this.textBox1.Text = txt;
}
}
}
using System;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form3 : Form
{
Form2 refToForm2;
public Form3( Form2 f2)
{
refToForm2 = f2;
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
//Pass any data to Form1;
refToForm2.refToForm1.updateText();
//Pass data to form2
refToForm2.UpdateForm2("from form3");
}
}
}
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