c# - 在 C# 中修复 JavaScript 的字符串

Question

我有一个函数可以修复 C# for JavaScript 中的不可打印字符。但是它工作起来很慢!如何提高这个功能的速度？

private static string JsStringFixNonPrintable(string Source)
    {
        string Result = "";
        for (int Position = 0; Position < Source.Length; ++Position)
        {
            int i = Position;
            var CharCat = char.GetUnicodeCategory(Source, i);
            if (Char.IsWhiteSpace(Source[i]) ||
                CharCat == System.Globalization.UnicodeCategory.LineSeparator ||
                CharCat == System.Globalization.UnicodeCategory.SpaceSeparator) { Result += " "; continue; }
            if (Char.IsControl(Source[i]) && Source[i] != 10 && Source[i] != 13) continue;
            Result += Source[i];
        }
        return Result;
    }

Answer 1

我已经使用 StringBuilder 类重新编码了您的代码片段，具有预定义的缓冲区大小...这比您的示例快得多。

    private static string JsStringFixNonPrintable(string Source)
    {
        StringBuilder builder = new StringBuilder(Source.Length); // predefine size to be the same as input
        for (int it = 0; it < Source.Length; ++it)
        {
            var ch = Source[it];
            var CharCat = char.GetUnicodeCategory(Source, it);
            if (Char.IsWhiteSpace(ch) ||
                CharCat == System.Globalization.UnicodeCategory.LineSeparator ||
                CharCat == System.Globalization.UnicodeCategory.SpaceSeparator) { builder.Append(' '); continue; }
            if (Char.IsControl(ch) && ch != 10 && ch != 13) continue;
            builder.Append(ch);
        }
        return builder.ToString();
    }