1.获取当前的item在当前的Listview中的位置
var view = ItemsControl.ItemsControlFromItemContainer(item) as ListView;
var index = view.ItemContainerGenerator.IndexFromContainer(item);
2.PasswordBox用法
<PasswordBox HorizontalAlignment="Left" Margin="205,148,0,141" Name="txtPwd" FontSize="20" Width="202" Background="Yellow" />
// 使用一个IntPtr类型值来存储加密字符串的起始点
IntPtr p = System.Runtime.InteropServices.Marshal.SecureStringToBSTR(this.txtPwd.SecurePassword);
// 使用.NET内部算法把IntPtr指向处的字符集合转换成字符串
string password = System.Runtime.InteropServices.Marshal.PtrToStringBSTR(p);
info.UserPwd = password;