c# winform 设置winform进入窗口后在文本框里的默认焦点

左手的ㄟ右手 2022-07-15 04:19 547阅读 0赞

[c\# winform 设置winform进入窗口后在文本框里的默认焦点][c_ winform _winform]

进入窗口后默认聚焦到某个文本框，两种方法：

①设置tabindex

把该文本框属性里的tabIndex设为0，焦点就默认在这个文本框里了。

②Winform的Activated事件

在Form的Activated事件中添加textBox1.Focus()，  即可获得焦点。

[?][Link 1]

<table> 
 <tbody> 
  <tr> 
   <td> 
    <div> 
     <div> 
      <code>private</code> 
      <code>void</code> 
      <code>Form1_Activated(</code> 
      <code>object</code> 
      <code>sender, EventArgs e)</code> 
     </div> 
     <div> 
      <code>{ </code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>textBox1.Focus();</code> 
     </div> 
     <div> 
      <code>}</code> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

TextBox是可以获得焦点的. 有几个前提：

1. TextBox所属的窗体(Form)在可操作(Active)状态. 即用户选中了Form.  
2. TextBox的Enable属性,Visiable属性为True.

刚开始时原以为在Form的Load事件中添加textBox1.Focus()，测试失败

[?][Link 1]

<table> 
 <tbody> 
  <tr> 
   <td> 
    <div> 
     <div> 
      <code>private</code> 
      <code>void</code> 
      <code>Form1_Load(</code> 
      <code>object</code> 
      <code>sender, EventArgs e)</code> 
     </div> 
     <div> 
      <code>{ </code> 
     </div> 
     <div> 
      <code>&nbsp;&nbsp;&nbsp;&nbsp;</code> 
      <code>textBox1.Focus();</code> 
     </div> 
     <div> 
      <code>}</code> 
     </div> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

因为在窗体加载时调用Focus()函数时， TextBox还未能成功的被显示到界面上。所以导致了失败。

分类: [ .NET学习笔记][.NET], [学习总结][Link 2]

标签: [ C\#][C], [WinForm][]

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posted on 2011-04-19 10:30 [ 海 华][Link 5] 阅读( 10823) 评论( 3) [ 编辑][Link 6] [ 收藏][Link 1]

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[\#1楼][1]  2013-03-12 21:39 | [ v.e.n.u.s][v.e.n.u.s] [  ][Link 7]

form1.shown+=....  
在注册时间里面可以写form1.focus();是可以有效获得焦点的，  
另外也可以调用api flashwindow来单次置顶form1,然后在form1.focus();  
  
//调用API  
\[System.Runtime.InteropServices.DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, ExactSpelling = true)\]  
public static extern IntPtr GetForegroundWindow(); //获得本窗体的句柄  
\[System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "SetForegroundWindow")\]  
public static extern bool SetForegroundWindow(IntPtr hWnd);//设置此窗体为活动窗体  
//定义变量,句柄类型  
public IntPtr Handle1;  
  
//在窗体加载的时候给变量赋值,即将当前窗体的句柄赋给变量  
  
void Form1\_Load(object sender, EventArgs e)  
\{  
Handle1 = this.Handle;  
timer2.Enabled = true;  
\}  
  
//加载一个定时器控件,验证当前WINDOWS句柄是否和本窗体的句柄一样,如果不一样,则激活本窗体  
  
private void timer2\_Tick(object sender, EventArgs e)  
\{  
if (Handle1 != GetForegroundWindow()) //持续使该窗体置为最前,屏蔽该行则单次置顶  
\{  
SetForegroundWindow(Handle1);  
  
//timer2.Stop();//此处可以关掉定时器，则实现单次置顶  
\}  
\}

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[\#2楼][2]  2013-11-14 10:58 | [ 愤怒的小黑][Link 8] [  ][Link 9]

我在load里写也可以获取焦点啊、怎么回事、

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[\#3楼][3]  3210320 2015/6/17 16:23:32 2015-06-17 16:23 | [ 野生码字员][Link 10] [  ][Link 11]

哈哈 TKS！

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