C＃如果每次都生成新表单，我如何处理表单的一次启动条件？ [英] C# How do I handle a one time startup condition for a form if the form is generated new each time?

问题描述

我有形式的A ，它在一个事件后打开形式B 然后隐藏自己。 表格B 为表格A 生成条件，然后返回到表格A >并关闭;但是，由于与代码冲突，我必须重新生成 form A ，以免遇到一个stackoverflow异常/我的应用程序无法正常关闭（由于形式A ，主窗体被隐藏）

这有点让人困惑，基本上我已经通过声明main然而，我希望能够处理首次启动事件，例如某些应用程序的教程消息。没有必须创建日志来存储我的布尔值的开销，我将如何检测它是否是第一次打开表单？

通常我会：

  Event（）{
 bool startup; 
 if（startup = true）{
 startup = false; 
 return; 
} 
 //其余代码
} 
  

然而，因为每次都会产生新的表单，所以这个表单将始终保持为真。

以下是代码：

表单一个变量：

  Account AccountForm = new Account（）; 
  

按钮事件：

  AccountForm.QR = this; 
 this.Hide（）; 
 AccountForm.ShowDialog（）; 
  

表格B：

  public Form QR {get;组; } 
  

按钮事件：

  QR = new QueryRefiner（）; 
 this.QR.Show（）; 
 this.Close（）; 
  

我认为这就是全部。我从QR中取出新的声明，并且会收到StackOverflow异常。我想我应该为此创造一个新的问题，但它就是这样。 （我认为我还在计时器中）

解决方案

好了，一个简单的解决方案是在 FormA 来获取一个参数，指示它是从 FormB 创建的，如下所示：

  public FormA（bool byFormB）
 {
 if（byFormB）
 {
 //做你必须做的从FormB 
} 
} 
  

创建它，然后创建它从 FormB ： FormA frm = new FormA（true）;

无论如何，我不会每次创建新的 FormA ，只是隐藏/显示它。

I have form A, which opens form B after an event then hides itself. Form B generates conditions for form A then returns to form A and closes itself; however, due to conflict with code, I will have to generate form A anew lest I encounter a stackoverflow exception / my application not closing properly (due to form A, the main form, being hidden)

This has gotten a bit confusing, essentially I've already solved this by declaring the main form as new each time, however, I wish to be able to handle first time startup events like those tutorial messages for certain applications. Without the overhead of having to create a log to store my boolean, how will I detect if it's the first time the form is opened?

Normally I would:

Event(){
  bool startup;
  if (startup = true) {
  startup = false;
  return;
  }
  //Rest of code
}

However, since the form is generated new each time, this will always remain true.

Here's the code:

Form A variables:

 Account AccountForm = new Account();

Button event:

        AccountForm.QR = this;
        this.Hide();
        AccountForm.ShowDialog();

Form B:

public Form QR { get; set; }

Button event:

    QR = new QueryRefiner();
    this.QR.Show();
    this.Close();

This is all of it I think. I take the new declaration out of QR, and I would receive a StackOverflow exception. I guess I should have created a new question for this, but there it is. (I think i'm on the timer still)

解决方案

Well,an easy solution is to make a new constructor in your FormA to get a parameter indicating that it is created from FormB, something like:

public FormA(bool byFormB)
{
    if (byFormB)
    {
        //do what you have to do when it's created from FormB
    }
}

And just create it like this from FormB: FormA frm=new FormA(true);

Anyway, I would not create a new FormA each time, just hide/show it.

这篇关于C＃如果每次都生成新表单，我如何处理表单的一次启动条件？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！