访问表单控件，例如来自其他类的openfiledialog

Question

我有使用openfileDialog1

的MainForm

public partial class MainForm : Form
{
    public MainForm()
    {
        InitializeComponent();
    }

    //I tried to return OpenFileDialog like this
    public OpenFileDialog ReturnOpenFileDialog()
    {
        return openFileDialog1;
    } 

  }

和类文件Facade.cs

public class Facade
{
   //How can I access to OpenFileDialog1 here?      

       /*Like: 
        openFileDialog1.Filter = "DLL|*.dll";
        if (openFileDialog1.ShowDialog() == DialogResult.OK)
        {....*/
}            

两个文件的命名空间相同，CakeFactory。 如何从Facade.cs访问控制MainForm的OpenFileDialog？

Answer 1

我建议在单独的实用程序类中定义ReturnOpenFileDialog（），然后创建该实用程序类的实例，并在需要时调用此方法。

另一种选择是使ReturnOpenFileDialog（）静态，然后你可以在Facade.cs中将其称为MainForm.ReturnOpenFileDialog（）

Answer 2

以下是示例代码

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        FormInstances.frm = this;
        new Facade();
    }


    public OpenFileDialog ReturnOpenFileDialog()
    {
        return openFileDialog1;
    }
}
public static class FormInstances
{
    public static Form1 frm { get; set; }
}
public class Facade
{
    public Facade()
    {
       OpenFileDialog f= FormInstances.frm.ReturnOpenFileDialog();
        f.Filter="DLL|*.dll";
        f.ShowDialog();

    }
}