blocks|key|846770|text|设置窗体的ActiveControl属性，就可以了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|846771|this.ActiveControl+=+yourtextboxname;|code-block|syntax|javascript|846772|entityMap^0|5|D|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Set the<code>ActiveControl</code> property of the form and you should be fine.

<pre><code>this.ActiveControl = yourtextboxname;
</code></pre>

blocks|key|846765|text|检查Tab键顺序并确保文本框设置为零|type|unstyled|depth|inlineStyleRanges|entityRanges|data|846766|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

check your tab order and make sure the textbox is set to zero

blocks|key|847161|text|如果控件尚未呈现，则不能将焦点设置为该控件。Form.Load()在呈现控件之前发生。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|847162|转到表单的事件并双击"Shown“事件。在表单显示的事件处理程序中，调用control.Focus()方法。|847163|++++private+void+myForm_Shown(object+sender,+EventArgs+e)
++++{
++++++++//+Call+textbox's+focus+method
++++++++txtMyTextbox.Focus();
++++}|code-block|syntax|javascript|847164|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You cannot set focus to a control if it has not been rendered. Form.Load() occurs before the controls are rendered.

Go to the form's events and double click the "Shown" event. In the form's shown event handler call the control.Focus() method. 

<pre><code> private void myForm_Shown(object sender, EventArgs e)
 {
 // Call textbox's focus method
 txtMyTextbox.Focus();
 }
</code></pre>

blocks|key|846807|text|如果只想在第一次显示窗体时设置焦点，请尝试处理Form.Shown事件并在那里设置焦点。否则，请使用Control.VisibleChanged。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|846808|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.windows.forms.form.shown.aspx|1|http://msdn.microsoft.com/en-us/library/system.windows.forms.control.visiblechanged.aspx^0|N|A|0|1E|M|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

If you only want to set the focus the first time the form is shown, try handling the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.form.shown.aspx">Form.Shown</a> event and doing it there. Otherwise use <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.control.visiblechanged.aspx">Control.VisibleChanged</a>.

blocks|key|630594|text|无法使其工作的原因是在绘制或呈现窗体之前调用了Load事件。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|630595|这就像是告诉披萨店如何制作你的披萨，然后让他们在制作之前给你发一张披萨上有多少意大利香肠的图片。|630596|using+System;
using+System.Windows.Forms;

namespace+Testing
{
++++public+partial+class+TestForm+:+Form
++++{
++++++++public+TestForm()
++++++++{
++++++++++++InitializeComponent();

++++++++++++Load+%2B=+TestForm_Load;

++++++++++++VisibleChanged+%2B=+TestForm_VisibleChanged;

++++++++++++Shown+%2B=+TestForm_Shown;

++++++++++++Show();

++++++++}

++++++++private+void+TestForm_Load(object+sender,+EventArgs+e)
++++++++{
++++++++++++MessageBox.Show("This+event+is+called+before+the+form+is+rendered.");
++++++++}

++++++++private+void+TestForm_VisibleChanged(object+sender,+EventArgs+e)
++++++++{
++++++++++++MessageBox.Show("This+event+is+called+before+the+form+is+rendered.");
++++++++}

++++++++private+void+TestForm_Shown(object+sender,+EventArgs+e)
++++++++{
++++++++++++MessageBox.Show("This+event+is+called+after+the+form+is+rendered.");
++++++++++++txtFirstName.Focus();
++++++++}
++++}
}|code-block|syntax|javascript|630597|entityMap^0|N|4|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

The reason you can't get it to work is because the <code>Load</code> event is called before the form is drawn or rendered.

It like telling a pizza place how to make your pizza, and then asking them to send you a picture of how much pepperoni is on your pizza before they made it.

<pre><code>using System;
using System.Windows.Forms;

namespace Testing
{
 public partial class TestForm : Form
 {
 public TestForm()
 {
 InitializeComponent();

 Load += TestForm_Load;

 VisibleChanged += TestForm_VisibleChanged;

 Shown += TestForm_Shown;

 Show();

 }

 private void TestForm_Load(object sender, EventArgs e)
 {
 MessageBox.Show("This event is called before the form is rendered.");
 }

 private void TestForm_VisibleChanged(object sender, EventArgs e)
 {
 MessageBox.Show("This event is called before the form is rendered.");
 }

 private void TestForm_Shown(object sender, EventArgs e)
 {
 MessageBox.Show("This event is called after the form is rendered.");
 txtFirstName.Focus();
 }
 }
}
</code></pre>

blocks|key|846878|text|Textbox.Focus()“尝试”在textbox元素上设置焦点。例如，在元素可见性被隐藏的情况下，Focus()将不起作用。因此，在调用Focus()之前，请确保您的元素可见。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|846879|entityMap^0|0|F|1G|7|1Z|7|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

<code>Textbox.Focus()</code> "Tries" to set focus on the textbox element. In case of the element visibility is hidden for example, <code>Focus()</code> will not work. So make sure that your element is visible before calling <code>Focus()</code>.

blocks|key|847021|text|我解决了更改TextBox的"TabIndex“属性的问题。我将TextBox设置为0，以便在程序启动时将焦点放在Form上。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|847022|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I solved my problem with changing "TabIndex" property of TextBox. I set 0 for TextBox that I want to focus it on Form when the program start.

blocks|key|846890|text|使用表单显示事件和设置|type|unstyled|depth|inlineStyleRanges|entityRanges|data|846891|MyTextBox.Focus();|code-block|syntax|javascript|846892|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

use form shown event and set

<pre><code>MyTextBox.Focus();
</code></pre>

blocks|key|847257|text|设置Tab+Index属性的值=0，然后以加载函数的形式写入：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|847258|YourTextboxName.Focus();|code-block|syntax|javascript|847259|看起来不错。|847260|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Set Tab Index property's value = 0 and then in form load function write :

<pre><code>YourTextboxName.Focus();
</code></pre>

It will work.

blocks|key|630771|text|将Tabstop设置为True，并将TabIndex设置为需要焦点的控件的最小值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|630772|例如，如果您有两个TextBoxes+:+TextBox1和TextBox2，请将两者的Tabstop设置为True，并将TabIndex分别设置为0和1。当表单加载时，焦点将在TextBox1上，按下“Tab”键时，焦点将移动到TextBox2。|630773|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Set Tabstop to True and TabIndex to the minimum to the control on which you need focus.

e.g. If you have 2 TextBoxes : TextBox1 and TextBox2, set Tabstop to True for both and TabIndex to 0 and 1 respectively. When the form loads, the focus will be on TextBox1 and on the press of 'Tab' key, the focus will move to TextBox2.

blocks|key|630675|text|将tabindex设置为0+this.yourtextbox.TabIndex+=0对我有效；|type|unstyled|depth|inlineStyleRanges|entityRanges|data|630676|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

it's worked for me 
set tabindex to 0
this.yourtextbox.TabIndex = 0;

blocks|key|630890|text|在表单上，转到属性并确保将"TopMost“属性设置为true，这将解决您的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|630891|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

on your form, go to properties and make sure that "TopMost" property is set to true,
that will solve your problem.

blocks|key|630997|text|最后我发现了我使用metro框架的问题，你的所有解决方案都不能在metroTextBox上工作，你所有的解决方案都可以在load，show，visibility_change，events中正常的textBox下工作，甚至标签索引=0都是有效的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|630998|+++//+private+void+Form1_VisibleChanged(object+sender,+EventArgs+e)
+++//+private+void+Form1__Shown(object+sender,+EventArgs+e)
++++private+void+Form1_Load(object+sender,+EventArgs+e)
++++{

++++++++textBox1.Select();
++++++++this.ActiveControl=textBox1;
++++++++textBox1.Focus();
++++}|code-block|syntax|javascript|630999|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Finally i found the problem i was using metro framework and all your solutions will not work with metroTextBox, and all your solutions will work with normal textBox
in load , show , visibility_change ,events, even the tab index = 0 is valid.
<pre><code> // private void Form1_VisibleChanged(object sender, EventArgs e)
 // private void Form1__Shown(object sender, EventArgs e)
 private void Form1_Load(object sender, EventArgs e)
 {

 textBox1.Select();
 this.ActiveControl=textBox1;
 textBox1.Focus();
 }
</code></pre>

blocks|key|630698|text|在jquery中设置焦点|type|unstyled|depth|inlineStyleRanges|entityRanges|data|630699|$(function()+{
++$("#txtBox1").focus();
});|code-block|syntax|javascript|630700|或者在Javascript中，您可以执行以下操作|630701|window.onload+=+function()+{
++document.getElementById("txtBox1").focus();
};|630702|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In jquery set focus 

<pre><code>$(function() {
 $("#txtBox1").focus();
});
</code></pre>

or in Javascript you can do 

<pre><code>window.onload = function() {
 document.getElementById("txtBox1").focus();
};
</code></pre>

I have in my C# program textBox

I need that when the program start, the focus will be on the textBox

I try this on Form_Load:

<pre><code>MyTextBox.Focus();
</code></pre>

but it wont work

how to put focus on TextBox when the form load?

Windows

我的C#程序中有textBox我需要的是，当程序启动时，焦点将在textBox上我在Form_Load上试了一下：MyTextBox.Focus();但它不会起作用

问如何在表单加载时将焦点放在TextBox上？
EN

回答 14

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问如何在表单加载时将焦点放在TextBox上？EN

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问如何在表单加载时将焦点放在TextBox上？
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