C# 从主窗体打开现有窗体
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Open an existing form from the main form
提问by
I designed two forms: Form1and Form2. Form1is the main form. There is a button in Form1, if I click the button, then Form2will pop out. I want to do something on Form2.
我设计了两种形式：Form1和Form2。Form1是主要形式。中有一个按钮Form1，如果我单击该按钮，Form2则会弹出。我想做点什么Form2。
// click button in Form1.
private void button1_Click(object sender, EventArgs e)
{
Form form2= new Form();
form2.ShowDialog();
}
But Form2is a new form rather than an existing form.
但是Form2是一种新形式而不是现有形式。
It is wrong.
这是错误的。
How? Thanks.
如何？谢谢。
采纳答案by Adil
You are creating instance of Form class not the Form2 which you have in your project. Create instance of Form2 which you created earlier and then call ShowDialog in it.
您正在创建 Form 类的实例，而不是您项目中的 Form2。创建您之前创建的 Form2 实例，然后在其中调用 ShowDialog。
You might have notice the in the program.cs something like Application.Run(new Form1()); Here we create the instance of Form1 and pass to Run method.
您可能已经注意到 program.cs 中的类似 Application.Run(new Form1()); 这里我们创建 Form1 的实例并传递给 Run 方法。
Do it this way by creating instance of Form2 and calling ShowDialog() method to show it
通过创建 Form2 的实例并调用 ShowDialog() 方法来显示它来做到这一点
Form2 form2= new Form2();
form2.ShowDialog();
回答by Tigran
Declare
宣布
Form2 form2= new Form2();
like your class member and use it like this:
像你的班级成员一样使用它：
private void button1_Click(object sender, EventArgs e)
{
form2.ShowDialog(); //blocking call
//or form2.Show() //non blocking call
}
EDIT
编辑
Based on correct comments, to make this work instead of executing the Close()on the function which will lead to Dispose()you need to use form2.Hide()to make is simply invisible
基于正确的注释，要使这项工作而不是执行Close()on 将导致Dispose()您需要使用form2.Hide()make 的函数根本不可见
回答by igofed
You create blank form with
您创建空白表单
Form Form2= new Form();
You should use
你应该使用
Form2 form2= new Form2();
Complete code:
完整代码：
private void button1_Click(object sender, EventArgs e)
{
Form2 form2= new Form2();
form2.ShowDialog();
}
回答by Shefat
private void button1_Click(object sender, EventArgs e)
{
InputForm form1 = new InputForm();
form1.Show();
}
Here InputForm means which form you want to open.
此处 InputForm 表示您要打开的表单。
回答by KaizenLouie
The question is "Open an existing form from the main form"
问题是“从主表单打开现有表单”
Okay lets change it a little, Open an existing instance of form from the main form.
好的，让我们稍微改变一下，从主窗体打开一个现有的窗体实例。
when you show a form
当你展示一个表格时
new Form2().Show();
lets say you hidit using
让我们说你隐藏它使用
Form2.Hide();
you guys canuse this
你们可以用这个
var Form2_instance = Application.OpenForms.OfType<Form2>().Single();
Form2_instance.Show();
