如何用預設文本替換輸入的文本c＃

Question

我想在Visual Studio中創建一個Windows窗體應用程序。我想要做的是，當用戶在RichTextBox中鍵入內容時，它會刪除您鍵入的內容並用預設的字母替換它。我到目前爲止是：

private void richTextBox1_TextChanged(object sender, EventArgs e) 
{ 
    string text = richTextBox1.Text; 
    richTextBox1.Text = text.Remove(text.Length - 1, 1); 
} 

因此，當你鍵入一個字母它會刪除它。之後我想要的是它添加了預設文本的一個字母。所以我們假設你有文字This is a test text that is reasonably long。當用戶輸入「A」時，會出現字母「T」。當用戶輸入另一個字母時，會出現下一個字母'h'，等等，直到顯示全文This is a test text that is reasonably long，然後您不能再輸入。

這裏是更多的代碼，如果需要的話：

private void button6_Click(object sender, EventArgs e) 
{ 
    webBrowser1.Navigate(textBox1.Text); 
} 

private void button5_Click(object sender, EventArgs e) 
{ 
    webBrowser1.Navigate("www.google.com"); 
} 

private void richTextBox1_TextChanged(object sender, EventArgs e) 
{ 
    string text = richTextBox1.Text; 
    richTextBox1.Text = text.Remove(text.Length - 1, 1); 
} 

Answer 1

你可以做一些類似的。

public string longText = "This is a test text that is reasonably long"; 
private void RichTextBox1_TextChanged(object sender, EventArgs e) 
{    
    // I don't know if the user can press enter 
    // and give you an empty string so this checks that 
    // and that richTextBox1.Text is not greater than the 
    // text you want replace with, in this case longText 
    if (richTextBox1.Text.Length <= longText.Length && richTextBox1.Text.Length > 0) 
    { 
     string text = richTextBox1.Text; 
     // removes the last character, Remove returns 
     // a new string so you have to save it somewhere 
     text = richTextBox1.Text.Remove(text.Length - 1, 1); 
     // here you add the character you want to replace 
     text += longText[richTextBox1.Text.Length - 1]; 
     richTextBox1.Text = text; 
    } 
    else if (richTextBox1.Text.Length > longText.Length) 
    { 
     // this case is when the user wants to add another 
     // character but the whole text it's been already replaced 
     richTextBox1.Text = richTextBox1.Text.Remove(richTextBox1.Text.Length - 1, 1); 
     } 
    } 

讓我知道這是否對您有幫助。