示例
String context = string.Emty;
private void BtnForward_Click(object sender, RoutedEventArgs e)
{
//First Click
context = Abcd;
TextboxText.Text = context; //Abcd
//Second Click
TextboxText.Text = context; //new context = SADASD
//Third Forth Fift click new string context
}
//Now how i can go back 5th string 4th string 3 2 1th string
private void BtnBack_Click(object sender, RoutedEventArgs e)
{
//Fift Forth Third Second First Observed string will show in the textbox
// Reverse back previous string with sequence
TextBoxText.Text = context; // Will reverse/Go back in sequence
}
我怎样才能回到字符串
甚至向前前进弦或反向后退。我的英语不够好解释,但如果你无法理解我说的话,请告诉我
答案 0 :(得分:0)
You need to keep references of the previous values. One approach is to keep a stack of strings where you push in the new value each time you hit BtnForward_Click()
and pop (the most recent one) when you hit BtnBack_Click()
. An example is given below:
Stack context = new Stack();
private void BtnForward_Click(object sender, RoutedEventArgs e)
{
// Here you would need to set the value of the Abcd based on your business logic
context.Push(Abcd);
}
private void BtnBack_Click(object sender, RoutedEventArgs e)
{
try
{
TextBoxText.Text = context.Peek(); // gets the most recently entered value of the stack that has not been removed (popped)
context.Pop();
}
catch (InvalidOperationException exc)
{
// Nothing to go back to
}
}