根據字串索引位置在WPFRichtextbox中搜索（WPF、NET.6C#）

我正在用 WPF（.NET 6）中的 RichTextBox 替換 TextBox，并且很難移植搜索代碼。我已經使用這些方法嘗試了 TextRange 和 TextPointer GetOffset()，但沒有任何效果。但是，下面的代碼有效。這對我來說似乎是一種解決方法，也許你們中的一個人覺得它有幫助或知道更好的方法。

var textRange = new TextRange(flowDocument.ContentStart, flowDocument.ContentEnd);
var text = textRange.Text;
int startIndex = 0;

// Set the start index to the offset 
if (StartPosition != null) 
{
    startIndex = textRange.Start.GetOffsetToPosition(StartPosition);
}

SearchResultValue searchResult;
var result = text.IndexOf(SearchPattern, startIndex, comparison);

// Any result value of 0 or greater indicates a hit
if (result >= 0) 
{
    // Hit
    var selectionStart = textRange.Start.GetPositionAtOffset(result);

    // Iterate over the index positions until the end of the search pattern. Is there a better way of doing it?
    var currentSelection = textRange.Start.GetPositionAtOffset(result);
    
    for (int run = 0; run < SearchPattern.Length; run  ) 
    {
        currentSelection = currentSelection.GetNextInsertionPosition(LogicalDirection.Forward);
    }

    var selectedRange = new TextRange(selectionStart, currentSelection);

    searchResult = new SearchResultValue(true, selectedRange);
} 
else 
{
    // No hit
    searchResult = new SearchResultValue(false, null);
}

return searchResult;

/// <summary>
/// Specifies the result of the search operation
/// </summary>
/// <param name="Successful">true if any content has been found</param>
/// <param name="start">the start index</param>
/// <param name="length">the length</param>
internal record struct SearchResultValue(bool Successful, TextRange ? Selection);

有更好的方法嗎？我花時間瀏覽 MSDN 和其他資源，這是我能找到的最好的。但我也是這個控制元件的新手。

謝謝！

uj5u.com熱心網友回復：

我終于可以解決了。唯一的解決方案似乎是決議每個段落并搜索每個段落中的文本。為了讓您了解我的意思：

internalSearchPosition 是一個私有 TextPointer 實體并存盤最新命中。SearchResultValue 只是我的視圖模型邏輯的回傳值。整個代碼太長了，不適合發布，但這是搜索功能的核心。

        while (currentBlock != null)
        {

            var paragraph = currentBlock as Paragraph;
            if (paragraph != null)
            {
                //
                //  Get the range of the paragraph content and search for the pattern
                //
                var paragraphRange = new TextRange(internalSearchPosition, paragraph.ContentEnd);
                var paragraphText = paragraphRange.Text;
                int result = paragraphText.IndexOf(searchPattern, comparison);
                if (result >= 0)
                {
                    //
                    // Hit. Build the search result and leave the for each loop
                    //
                    var startSelection = paragraph.ContentStart.GetPositionAtOffset(result);
                    var endSelection = startSelection.GetPositionAtOffset(searchPattern.Length 1);
                    searchResult = new SearchResultValue(true, new TextRange(startSelection,endSelection));

                    // Save the current position
                    internalSearchPosition = endSelection;

                    break;
                }
            }

            // Go to the next block or leave the loop when NextBlock is null (end of paragraphs). Also reset the internal search position if required.
            currentBlock = currentBlock.NextBlock;
            if (currentBlock != null)
            {
                internalSearchPosition = currentBlock.ContentStart;
            }
        }

標籤：C＃ 。网 wpf 富文本框

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