c# - 当用户在 richtextbox 中输入时，我可以使用 WPF 进行自动单词替换吗

Question

    public void overallTextReplace(RichTextBox[] rtb) {
        string[] keyword = { "FCI", "CNG", "DCR", "EZR", "VASC", "CND" };
        string[] newString = { "Forecourt Controller","Case Number Declined" ,"Case Number Given", "Dispenser Card reader", "Enhanced Zone Router", "Verifone Authorized Service Contractor" };
        TextRange[] text = new TextRange[rtb.Length];

        for (int I = 0; I < rtb.Length; I++) {
            text[I] = new TextRange(rtb[I].Document.ContentStart, rtb[I].Document.ContentEnd);
        }


        for (int I = 0; I < text.Length; I++) {
            for (int K = 0; K < keyword.Length; K++) {
                TextPointer current = text[I].Start.GetInsertionPosition(LogicalDirection.Forward);
                string textInRun = current.GetTextInRun(LogicalDirection.Forward);
                if (!string.IsNullOrEmpty(textInRun)) {
                    int index = textInRun.IndexOf(keyword[K]);
                    if (index != -1) {
                        TextPointer selectionStart = current.GetPositionAtOffset(index, LogicalDirection.Forward);
                        TextPointer selectionEnd = selectionStart.GetPositionAtOffset(keyword.Length, LogicalDirection.Forward);
                        TextRange selection = new TextRange(selectionStart, selectionEnd);
                        selection.Text = newString[K];
                        selection.ApplyPropertyValue(TextElement.FontWeightProperty, FontWeights.Regular);
                        rtb[I].Selection.Select(selection.Start, selection.End);
                        rtb[I].Focus();
                    }
                }
                current = current.GetNextInsertionPosition(LogicalDirection.Forward);
            }
        }
    }

好的，当传递给函数时，这段代码将查看 WPF 表单中的所有 RichTextBox，然后查找列出的关键字并将它们替换为 newString。我遇到的问题是程序从头到尾只看一行文本。如果它检测到一个换行符，它不会看过去，例如:第 1 行:FCI 是一个燃料 Controller 。它替换它就好了，但如果我在第 2 行有更多内容，它就不会进行替换。如果有什么不同的话，它们是 6 个 richTextBoxes 被传递给这个函数。

只是发现了一个错误，但与我的第一个问题无关。所以看起来有 6 个数组索引会阻止代码运行并在 TextRange selection = new Textrange(selectionStart, selectionEnd) 上抛出一个空引用；但如果我用 VASC 作为要替换的词，他们也不异常(exception)。我不确定为什么。

Answer 1

对于 winforms:试试这个(虽然我没有运行这段代码，但从逻辑上讲它应该可以工作):

 public void overallTextReplace(RichTextBox[] rtb) 
{
     string[] keyword = { "FCI", "CNG", "DCR", "EZR", "VASC", "CND" };
     string[] newString = { "Forecourt Controller","Case Number Declined" ,"Case Number Given", "Dispenser Card reader", "Enhanced Zone Router", "Verifone Authorized Service Contractor" };
     for (int i = 0; i < rtb.Length; i++) 
     {
         for (int j = 0; j < 6; j++) 
        {
             rtb[i].Rtf=rtb[i].Rtf.Replace(keyword[j],newString[j]);
        }
     }
}

对于 wpf:

for (int i = 0; i < rtb.Length; i++) 
{
  RichTextBox rtb_wording= rtb[i];
  var textRange = new TextRange(rtb_wording.Document.ContentStart, rtb_wording.Document.ContentEnd);
  string rtf;
  using (var memoryStream = new MemoryStream())
  {
     textRange.Save(memoryStream, DataFormats.Rtf);
     rtf = ASCIIEncoding.Default.GetString(memoryStream.ToArray());
  }
  for (int j = 0; j < 6; j++) 
  {
    rtf =rtf.Replace(keyword[j],newString[j]);
  }
  MemoryStream stream = new MemoryStream (ASCIIEncoding.Default.GetBytes(rtf));
  rtb_wording.SelectAll();
  rtb_wording.Selection.Load(stream, DataFormats.Rtf);
}