从WinForms的其他形式的访问公共财产 [英] accessing public property from other form in winforms

问题描述

例如我有Form 1和Form。
Form1上具有公共财产

For example I have Form1 and Form2. Form1 has public property

 public IMyCustomType selectedOption;

在 Form1中有组合框自定义对象列表。我想，当用户选择选项从该组合列表selectedOption与价值填充，像

Inside Form1 there is comboBox with custom object list. I want when user select option from that combo list to selectedOption populate with that value, like

public IMyCustomType selectedOption;

private void availableChoices_SelectedIndexChanged(object sender, EventArgs e)
{             
   selectedOption = (IMyCustomType)availableChoices.SelectedItem;                                        
}

在窗体2 我要创建所选类型的新实例。如何从窗口2 进入到 selectedOption 属性，并使用该值来创建新的实例？

Inside Form2 I want to create new instance of that selected type. How to access from form2 to that selectedOption property and use that value to create new instance?

推荐答案

如果窗体2从Form1中所示，你可以使用重载用owner参数：

if form2 is shown from form1, you may use overload with owner parameter:

form2.Show(form1);

然后在窗口2，你简单的把它从主人属性：

then in form2 you simple take it from owner property:

((Form1)this.Owner).selectedOption

或者您可以了解创建的窗体2公开的方法，将接受所选选项作为参数，并显示窗体2之前调用它。

Or alternatively you can craete public method in form2, that would accept selected option as parameter and call it before showing form2.

public class Form2 : Form {
  private IMyCustomType parentSelectedOption;
  ...
  public void InitParameters(IMyCustomType selectedOption) 
  {
      parentSelectedOption = selectedOption;
  }
}

public class Form1 : Form {
     ....
     var form2 = new Form2();
     form2.InitParameters(selectedOption);
     form2.Show();
}

心灵的命名虽然，公共属性（在你的情况下，它是场）通常使用驼峰而得名。

Mind naming though, public properties (in your case it is field) are usually named using CamelCase.

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