C# 如何使用 public get set 从 Form 2 启用 Form 1 中的按钮？
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How to enable button in Form 1 from Form 2 using public get set?
提问by jhyap
I have two buttons in Form 1, one is "ShowForm2" button and one is "button1" button.
我在 Form 1 中有两个按钮，一个是“ShowForm2”按钮，一个是“button1”按钮。
Button 1 is disable by default. And when I click "ShowForm2" button, Form 2 will show.
默认情况下，按钮 1 处于禁用状态。当我单击“ShowForm2”按钮时，将显示 Form 2。
So, what I want is, when I click the "button2" in form 2, it will enable the "button1" in form 1.
所以，我想要的是，当我单击表单 2 中的“button2”时，它将启用表单 1 中的“button1”。
So, I try to code like this in my form2 class:
所以，我尝试在我的 form2 类中这样编码：
public partial class Form2 : Form
{
bool enable_form1_button1;
public bool Enable_form1_button1
{
get { return this.enable_form1_button1; }
set { this.enable_form1_button1 = value; }
}
public Form2()
{
InitializeComponent();
}
private void button2_Click(object sender, EventArgs e)
{
enable_form1_button1 = true;
}
}
Then in my Form1 class, I am expecting to get the "enable_form1_button1 = true" to pass into form 1 and enable my form 1 button1. But how to do this?
然后在我的 Form1 类中，我希望将“enable_form1_button1 = true”传递到表单 1 并启用我的表单 1 button1。但是如何做到这一点呢？
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void btb_Showfrm2_Click(object sender, EventArgs e)
{
Form2 frm2 = new Form2();
frm2.Show();
button1.Enabled = frm2.Enable_form1_button1; // I put it here, and it just does not seems right
}
}
采纳答案by Mukesh Sakre
Form1.cs
表格1.cs
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
button1.Enabled = false;
}
private void button2_Click(object sender, EventArgs e)
{
Form2 oFrm2 = new Form2();
oFrm2.evtFrm += new ShowFrm(oFrm2_evtFrm);
oFrm2.Show();
}
void oFrm2_evtFrm()
{
button1.Enabled = true;
}
}
Form2.cs
表格2.cs
public delegate void ShowFrm();
public partial class Form2 : Form
{
public event ShowFrm evtFrm;
public Form2()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
if (evtFrm != null)
{
evtFrm();
}
}
}
回答by Dimitar Dimitrov
Well what you can do is, expose the button as a property and send a reference of your current form to the form that needs to take control:
那么您可以做的是，将按钮作为属性公开，并将当前表单的引用发送到需要控制的表单：
Form1
表格1
public partial class Form1 : Form
{
public Button BtnShowForm2
{
get { return btnShowForm2; }
set { btnShowForm2 = value; }
}
private void btnShowForm2_Click(object sender, EventArgs e)
{
// pass the current form to form2
Form2 form = new Form2(this);
form.Show();
}
}
Then in Form2:
然后在Form2 中：
public partial class Form2 : Form
{
private readonly Form1 _form1;
public Form2(Form1 form1)
{
_form1 = form1;
InitializeComponent();
}
private void btnEnabler_Click(object sender, EventArgs e)
{
// access the exposed property here <-- in this case disable it
_form1.BtnShowForm2.Enabled = false;
}
}
I hope this is what you're looking for.
我希望这就是你要找的。
回答by hm1984ir
you can send a refrence of your form1 to your form2 in the from2 constructor for example : and then in button clicked event handler in form2 call a public method in form1 to enable the button :
例如，您可以在 from2 构造函数中将您的 form1 的引用发送到您的 form2：然后在 form2 中的按钮单击事件处理程序中调用 form1 中的公共方法以启用按钮：
this could be your form1 code :
这可能是您的 form1 代码：
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Form2 frm = new Form2(this);
frm.Show();
}
public void enableButton()
{
button2.Enabled = true;
}
this could be your form2 code :
这可能是您的 form2 代码：
public partial class Form2 : Form
{
private Form1 frm;
public Form2(Form1 frm)
{
InitializeComponent();
this.frm = frm;
}
private void button1_Click(object sender, EventArgs e)
{
frm.enableButton();
}
回答by dharmatech
If you'll only have one instance of Form1you can also get away with having a static Buttonmember in Programwhich references the button you want to enable from Form2.
如果您只有一个实例，Form1您也可以使用一个静态Button成员，Program其中引用您要启用的按钮Form2。
Form1.cs:
Form1.cs：
using System;
using System.Windows.Forms;
namespace StackOverflow_2013_05_19_Form1_Form2_buttons
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
button2.Enabled = false;
Program.button = button2;
}
private void button1_Click(object sender, EventArgs e)
{ new Form2().Show(); }
private void button2_Click(object sender, EventArgs e) { }
}
}
Form2.cs:
Form2.cs：
using System;
using System.Windows.Forms;
namespace StackOverflow_2013_05_19_Form1_Form2_buttons
{
public partial class Form2 : Form
{
public Form2()
{ InitializeComponent(); }
private void button1_Click(object sender, EventArgs e)
{ Program.button.Enabled = true; }
}
}
Program.cs:
程序.cs：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
namespace StackOverflow_2013_05_19_Form1_Form2_buttons
{
static class Program
{
public static Button button;
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}
回答by Mukesh Sakre
I would recommend you to use event/delegates to perform this task. This is the standard way of doing so.
我建议您使用事件/委托来执行此任务。这是这样做的标准方法。
Again passing reference in constructor or making static func/var/properties are just workaround and Called as bad programming.
再次在构造函数中传递引用或制作静态 func/var/properties 只是解决方法，并被称为糟糕的编程。
