使用C＃.net将函数从Form调用到另一个表单 [英] call a function from Form to another form using C#.net

问题描述

项目有3个Forms.that是Form1，Form2，Form3.One按钮位于每个form.One函数位于Form中，名为Message（）。我只是从Form3调用该函数。

但它没有用。



Form1

  private   void  button1_Click（ object  sender，EventArgs e）
 {
 Form2 frm =  new  Form2（）; 
 frm.Show（）; 
} 

功能

  public   void  message（）
 {
 pictureBox1.ImageLocation =  @ < span class =code-string> C：\Documents and Settings \User\My Documents\My Pictures\ index.JPEG; 
} 

Form2

  private   void  button1_Click（ object  sender，EventArgs e）
 {
  this  .Close（）; 
 Form3 frm =  new  Form3（）; 
 frm.Show（）; 
 
} 

Form3

声明

 Form1 frm =  new  Form1; 

  private   void  button1_Click（ object  sender， EventArgs e）
 {
 
 frm.message（）; 
  this  .Close（）; 
} 

但它没有用。请帮助我。为什么？我在图片框中上传了一张图片。如何解决这个问题？请做好...

解决方案

这取决于你打电话给消息时你期望发生的事情方法。

如果你期望它在Form1的新实例（你看不到）上设置pictureBox1的ImageLocation属性，那么它正在做你正在期待的。



如果您希望它影响创建For2和Form3的现有Form1上的pictureBox1，或者影响For2或Form3的PictureBox，那么它就赢了t，你需要仔细考虑你在做什么，并访问你希望影响的表格的实际实例。



你想做什么？ ？你期望它做什么？

使形成对象并调用该功能。 。 。

喜欢：



FORM1 FRM =新FORM1（）;

FRM.MESSAGE（）;

Hi,
Project has a 3 Forms.that is Form1,Form2,Form3.One button is in the Each form.One Function is in the Form that is called Message(). I just call that function from Form3.
But It is not worked.

Form1

private void button1_Click(object sender, EventArgs e)
{
Form2 frm = new Form2();
frm.Show();
}

Function

public void message()
{
pictureBox1.ImageLocation = @"C:\Documents and Settings\User\My Documents\My Pictures\index.JPEG";
}

Form2

private void button1_Click(object sender, EventArgs e)
{
this.Close();
Form3 frm = new Form3();
frm.Show();

}

Form3
Declaration

Form1 frm = new Form1;

private void button1_Click(object sender, EventArgs e)
{

frm.message();
this.Close();
}

But it is not worked.Please help me.why?I upload a picture in the Picture Box. how to solve this issue?Please do needful...

解决方案

It depends what you are expecting to happen when you call the message method.
If you are expecting it to set the ImageLocation property of pictureBox1 on the new instance of Form1 (which you can't see) then it is doing exactly what you are expecting.

If you are expecting it to affect the pictureBox1 on the existing Form1 that created For2 and Form3, or to affect a PictureBox of For2 or Form3, then it won't, and you need to think carefully about what you are doing, and access the actual instance of the form that you expect to affect.

What are you trying to do? What do you expect it to do?

MAKE TO FORM3 OBJECT AND CALL THAT FUNCTION . . .
LIKE:

FORM1 FRM = NEW FORM1();
FRM.MESSAGE();

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