在C＃winform中加載用戶控件時，將焦點放在文本框中

Question

如何在用戶控件加載時將焦點置於文本框？

在winforms中，我寫了textbox1.focus()，在usercontrol.load()但它沒有工作。

Answer 1

改爲使用.Select（）方法。

textBox1.Select(); 

或

private void Form1_Load(object sender, EventArgs e) 
{ 
    this.ActiveControl = textBox1; 
} 

Alternativly你可以嘗試：

private TextBox TextFocusedFirstLoop() 
{ 
    // Look through all the controls on this form. 
    foreach (Control con in this.Controls) 
    { 
    // Every control has a Focused property. 
    if (con.Focused == true) 
    { 
     // Try to cast the control to a TextBox. 
     TextBox textBox = con as TextBox; 
     if (textBox != null) 
     { 
     return textBox; // We have a TextBox that has focus. 
     } 
    } 
    } 
    return null; // No suitable TextBox was found. 
} 

private void SolutionExampleLoop() 
{ 
    TextBox textBox = TextFocusedFirstLoop(); 
    if (textBox != null) 
    { 
    // We have the focused TextBox. 
    // ... We can modify or check parts of it. 
    } 
}