如何在方法之外使用在方法中声明的变量? [英] How do I use a variable declared in a method, outside that method?

问题描述

我正在使用VS 2008(C#)...我已经在GlobalClass中创建了一个函数以全局使用它..这是用于打开对话框的.当我在方法中调用此函数时，它可以工作，但是我无法使用在此创建的对象"OFD" ...

I am using VS 2008 (C#)... I have created a function in a GlobalClass to use it globally.. This is for opening a dialog box. When I call this function in my method it works but I am not able to use the Object "OFD" that I have created here...

static class GlobalClass
{
 public static void OFDbutton()
  {
   OpenFileDialog ofd = new OpenFileDialog();
   ofd.Filter = "Image files|*.jpg;*.jpeg;*.png;*.gif";
   DialogResult dr = ofd.ShowDialog();
  }
}

在表单方法中.我正在使用

In the form method. I am using

globalclass.ofdbutton(); //Calling the function
lable1.text=ofd.filename;

我想使用对象"ofd"，但无法使用..为此，我必须做的事，请帮忙

I want to use object "ofd" but I am unable to do so.. What I have to do about this, please help

推荐答案

我想你想要的是

static class GlobalClass
{
 public static OpenFileDialog OFDbutton()
  {
   OpenFileDialog ofd = new OpenFileDialog();
   ofd.Filter = "Image files|*.jpg;*.jpeg;*.png;*.gif";
   DialogResult dr = ofd.ShowDialog();
   return ofd;
  }
}

会返回 OpenFileDialog 对象.现在您可以

which gives back the OpenFileDialog object. Now you can

OpenFileDialog ofd = globalclass.ofdbutton(); //Calling the function
label1.text=ofd.filename;

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