WPF學習筆記 - 5 WPF 控制項 - TextBox、PasswordBox

用過winform應該都知道TextBox就是供使用者輸入的文字區塊

<TextBox /> - 單行

<TextBox AcceptsReturn="True" TextWrapping="Wrap" />

AcceptsReturn讓TextBox變多行，

TextWrapping="Wrap"當TextBox的字過長時，會自動把原本輸入的字往上移，讓使用者輸入新的字

其他屬性

SpellCheck.IsEnabled="True" Language="en-US" - 開啟自動拼字檢查功能

IsReadOnly="True" - TextBox只能唯讀

綁定SelectionChanged事件

<DockPanel Margin="10">

                <TextBox SelectionChanged="TextBox_SelectionChanged" DockPanel.Dock="Top" />

                <TextBox Name="txtStatus" AcceptsReturn="True" TextWrapping="Wrap" IsReadOnly="True" />

</DockPanel>

private void TextBox_SelectionChanged(object sender, RoutedEventArgs e)

{

                        TextBox textBox = sender as TextBox;

                        txtStatus.Text = "Selection starts at character #" + textBox.SelectionStart + Environment.NewLine;

                        txtStatus.Text += "Selection is " + textBox.SelectionLength + " character(s) long" + Environment.NewLine;

                        txtStatus.Text += "Selected text: '" + textBox.SelectedText + "'";

}

// textBox.SelectionStart - 判斷鼠標在哪個字元，從0開始

// Environment.NewLine - 斷行

// textBox.SelectionLength - User選了幾個字元

// textBox.SelectedText - User選了什麼字

PasswordBox - 供使用者輸入密碼的區塊

TextBox的內容改為隱藏

<PasswordBox />

可以更改成想要的字

<PasswordBox PasswordChar="X" />

設定最大長度

<PasswordBox MaxLength="6" />

用C#獲得PasswordBox的密碼

IntPtr p = System.Runtime.InteropServices.Marshal.SecureStringToBSTR(txtPassword.SecurePassword);

string password = System.Runtime.InteropServices.Marshal.PtrToStringBSTR(p);