ReplacingArgs.Replacement property


public string Replacement { get; set; }



    Document doc = new Document();
    DocumentBuilder builder = new DocumentBuilder(doc);

    builder.Writeln("Our new location in New York City is opening tomorrow. " +
                    "Hope to see all our NYC-based customers at the opening!");

    // 我们可以使用“FindReplaceOptions”对象来修改查找和替换过程。
    FindReplaceOptions options = new FindReplaceOptions();

    // 设置一个回调来跟踪“替换”方法将进行的任何替换。
    TextFindAndReplacementLogger logger = new TextFindAndReplacementLogger();
    options.ReplacingCallback = logger;

    doc.Range.Replace(new Regex("New York City|NYC"), "Washington", options);

    Assert.AreEqual("Our new location in (Old value:\"New York City\") Washington is opening tomorrow. " +
                    "Hope to see all our (Old value:\"NYC\") Washington-based customers at the opening!", doc.GetText().Trim());

    Assert.AreEqual("\"New York City\" converted to \"Washington\" 20 characters into a Run node.\r\n" +
                    "\"NYC\" converted to \"Washington\" 42 characters into a Run node.", logger.GetLog().Trim());

/// <summary>
/// 维护由查找和替换操作完成的每个文本替换的日志
/// 并注意原始匹配文本的值。
/// </summary>
private class TextFindAndReplacementLogger : IReplacingCallback
    ReplaceAction IReplacingCallback.Replacing(ReplacingArgs args)
        mLog.AppendLine($"\"{args.Match.Value}\" converted to \"{args.Replacement}\" " +
                        $"{args.MatchOffset} characters into a {args.MatchNode.NodeType} node.");

        args.Replacement = $"(Old value:\"{args.Match.Value}\") {args.Replacement}";
        return ReplaceAction.Replace;

    public string GetLog()
        return mLog.ToString();

    private readonly StringBuilder mLog = new StringBuilder();