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POWhen I redo using this undo/redo code, the first thing undone cannot be redone
 

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  1. POWhen I redo using this undo/redo code, the first thing undone cannot be redone
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    <p>I am using the following code in order to implement undo/redo into my application:</p> <pre><code> public struct UndoSection { public string Undo; public int Index; } </code></pre> <p>--</p> <pre><code> public UndoSection(int index, string undo) { Index = index; Undo = undo; } </code></pre> <p>--</p> <pre><code> Stack&lt;UndoSection&gt; UndoStack = new Stack&lt;UndoSection&gt;(); private void Form1_KeyDown(object sender, KeyEventArgs e) { if (e.Modifiers == Keys.None &amp;&amp; e.KeyCode == Keys.Delete) UndoStack.Push(new UndoSection(richTextBoxPrintCtrl1.SelectionStart, richTextBoxPrintCtrl1.SelectedText)); else if (e.Control &amp;&amp; e.KeyCode == Keys.Z) { e.Handled = true; undo_Click(richTextBoxPrintCtrl1, new EventArgs()); } } public string[] RTBRedoUndo; public int StackCount = 0; public int OldLength = 0; public int ChangeToSave = 5; public bool IsRedoUndo = false; </code></pre> <p>--</p> <pre><code> public void RTBTextChanged() { if (richTextBoxPrintCtrl1.TextLength - OldLength &gt;= ChangeToSave | richTextBoxPrintCtrl1.TextLength - OldLength &lt;= ChangeToSave) { StackCount += 1; RTBRedoUndo[StackCount] = richTextBoxPrintCtrl1.Text; } } public void UndoCode() { IsRedoUndo = true; if (StackCount &gt; 0 &amp;&amp; RTBRedoUndo[StackCount - 1] != null) { StackCount = StackCount - 1; richTextBoxPrintCtrl1.Text = RTBRedoUndo[StackCount]; } } public void RedoCode() { if (IsRedoUndo == false &amp;&amp; richTextBoxPrintCtrl1.Text.Substring(richTextBoxPrintCtrl1.Text.Length - 1, 1) == " ") IsRedoUndo = true; if (StackCount &gt; 0 &amp;&amp; RTBRedoUndo[StackCount + 1] != null) { StackCount = StackCount + 1; richTextBoxPrintCtrl1.Text = RTBRedoUndo[StackCount]; } </code></pre> <p>However, if I type some text in my rich text box such as: "Hello. This is my application.", It will only let me redo up to "my". It won't let me redo "application.". And if I undo all text, I then cannot redo and restore the text.</p> <p>What is causing this to behave in this manner? I really need to get this undo/redo code working correct. Could somebody help point me in the right direction, please?</p> <p>--EDIT--</p> <p>Redo code:</p> <pre><code>public void RedoCode() { if (IsRedoUndo == false &amp;&amp; richTextBoxPrintCtrl1.Text.Substring(richTextBoxPrintCtrl1.Text.Length - 1, 1) == " ") IsRedoUndo = true; if (StackCount &gt; 0 &amp;&amp; RTBRedoUndo[StackCount + 1] != null) { StackCount = StackCount + 1; richTextBoxPrintCtrl1.Text = RTBRedoUndo[StackCount]; } } </code></pre> <p>It is called by a button click, using RedoCode();</p>
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