如何从窗体级别检测文本框中的按键事件 [英] how to detect a keypress event in textbox from the form level

问题描述

嗨 我在一个Windows窗体上有大约50个文本框.我不想为每个文本框编写按键事件.是否有任何父级表单事件检测到任何文本框上都有按键.
到目前为止，我已经尝试过:

 [DllImport(" ]
内部 静态 外部 私有控件GetFocusedControl()
        {
            Control focusControl = 空;
             IntPtr  focusedHandle = GetFocus();
            如果(focusedHandle！=  IntPtr .零)
            focusControl = Control.FromHandle(focusedHandle);
            返回 focusedControl；
        }
私有 无效 Form1_KeyPress(对象发​​件人，KeyPressEventArgs e)
        {
            如果(GetFocusedControl().GetType().ToString()== " )
           
            {
               // 我的代码... 
            }
                     
           
        } 

但是当活动控件是文本框form1_keypress事件未触发时??
任何帮助将不胜感激....

解决方案

set

 此.KeyPreview=  true ; 

并使用此代码

 私有  void  Form1_KeyPress(对象发​​件人，KeyPressEventArgs e)
       {
            foreach (控制项 in   this . )
           {
               如果(例如，是文本框)
               {
                   如果(重点关注)
                   {
                       // 为聚焦"文本框做些事情
                       con.Text = " ;
                   }
               }
           }
       }

或使用以下代码:

 私有  void  Form1_KeyPress(对象发​​件人，KeyPressEventArgs e)
{
    Control con = 此 .ActiveControl;
    如果(例如，是文本框)
    {
            // 对焦点"文本框或写"事件进行处理
            con.Text = " ;
    }
}

  public  Form1()
{
    InitializeComponent();
    CreateKeyPressEvent(此 .Controls);
}

无效 CreateKeyPressEvent(System.Windows.Forms.Control.ControlCollection ctrls)
{
     foreach (Ctrls   ctrls中的控件)
    {
        如果(c 是文本框)
        {
            c.KeyPress + = 新 KeyPressEventHandler(c_KeyPress);
        }
        其他
            CreateKeyPressEvent(c.Controls);
    }
}

无效 c_KeyPress(对象发​​送者，KeyPressEventArgs e)
{
    TextBox tb =(TextBox)发送器;
    // 使用此"tb"做任何您想做的事
} 

this 中设置.KeyPreview= true ;

构造函数您将能够接收所有KeyPress，KeyDown和KeyUp事件

hi i have about 50 textboxes on a single windows form. i dont want to write keypress event for each textbox. is there any parent form level event which detect that there is keypress on any of the textbox.
i have tried so far:

[DllImport("user32.dll"]
internal static extern IntPtr GetFocus();
private Control GetFocusedControl()
        {
            Control focusedControl = null;
            IntPtr focusedHandle = GetFocus();
            if (focusedHandle != IntPtr.Zero)               
            focusedControl = Control.FromHandle(focusedHandle);
            return focusedControl;
        }
private void Form1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (GetFocusedControl().GetType().ToString() == "System.Windows.Forms.TextBox")
           
            {
               //my code...
            }
                     
           
        }

but when the active control is a textbox form1_keypress event not being fired??
any help will be highly appreciated....

解决方案

set

this.KeyPreview = true;

and use this code

private void Form1_KeyPress(object sender, KeyPressEventArgs e)
       {
           foreach (Control con in this.Controls)
           {
               if (con is TextBox)
               {
                   if (con.Focused)
                   {
                       //Do somthing for Focused text box
                       con.Text = "s";
                   }
               }
           }
       }

or use this code:

private void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
    Control con = this.ActiveControl;
    if (con is TextBox)
    {
            //Do somthing for Focused text box or Write event
            con.Text = "s";
    }
}

public Form1()
{
    InitializeComponent();
    CreateKeyPressEvent(this.Controls);
}

void CreateKeyPressEvent(System.Windows.Forms.Control.ControlCollection ctrls)
{
    foreach (Control c in ctrls)
    {
        if (c is TextBox)
        {
            c.KeyPress += new KeyPressEventHandler(c_KeyPress);
        }
        else
            CreateKeyPressEvent(c.Controls);
    }
}

void c_KeyPress(object sender, KeyPressEventArgs e)
{
    TextBox tb = (TextBox)sender;
    // Do whatever you want with this "tb"
}

Form.KeyPreview Property[^]

Just set

this.KeyPreview = true;

in the constructor & you will able to receive all KeyPress, KeyDown, and KeyUp events

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