在richtextbox中保留一定數量的行嗎？

Question

我要保持一定數量的RichTextBox的線，所以我做了以下內容：

private void txt_Log_TextChanged(object sender, EventArgs e) 
    { 
     int max_lines = 200; 
     if (txt_Log.Lines.Length > max_lines) 
     { 
      string[] newLines = new string[max_lines]; 
      Array.Copy(txt_Log.Lines, 1, newLines, 0, max_lines); 
      txt_Log.Lines = newLines; 
     } 
     txt_Log.SelectionStart = txt_Log.Text.Length; 
     txt_Log.ScrollToCaret(); 
    } 

但運行時我Richtextnbox連續閃爍，所以我應該怎麼做這個光滑？

Answer 1

當您更新txt_Log.Lines屬性的值時，txt_Log_TextChanged事件再次觸發。

你可以使用一個變量bool阻止它：

private bool updatingTheText; 

private void txt_Log_TextChanged(object sender, EventArgs e) 
{ 
    if (updatingTheText) 
     return; 

    const int max_lines = 200; 
    if (txt_Log.Lines.Length > max_lines) 
    { 
     string[] newLines = new string[max_lines]; 
     Array.Copy(txt_Log.Lines, 1, newLines, 0, max_lines); 
     updatingTheText = true; // Disable TextChanged event handler 
     txt_Log.Lines = newLines; 
     updatingTheText = false; // Enable TextChanged event handler 
    } 
    txt_Log.SelectionStart = txt_Log.Text.Length; 
    txt_Log.ScrollToCaret(); 
}