0 
public static string[] GetStringInBetween(string strBegin, string strEnd, string strSource, bool includeBegin, bool includeEnd)
        {
            string[] result = { "", "" };
            int iIndexOfBegin = strSource.IndexOf(strBegin);

            if (iIndexOfBegin != -1)
            {
                // include the Begin string if desired
                if (includeBegin)
                    iIndexOfBegin -= strBegin.Length;

                strSource = strSource.Substring(iIndexOfBegin + strBegin.Length);
                int iEnd = strSource.IndexOf(strEnd);

                if (iEnd != -1)
                {
                    // include the End string if desired
                    if (includeEnd)
                        iEnd += strEnd.Length;

                    result[0] = strSource.Substring(0, iEnd);

                    // advance beyond this segment
                    if (iEnd + strEnd.Length < strSource.Length)
                        result[1] = strSource.Substring(iEnd + strEnd.Length);
                }
            }

            return result;
        }

用法：

string[] result = null;
result = HtmlHelper.GetStringInBetween(bits[0], bits[1], tagValuePair.Value, true, true);

我正在使用 dottrace，这种方法占用了我 33% 的 CPU。我该如何优化它。因为它我的应用程序崩溃或者我的内存不足。这种方法是静态的聪明吗？

dottrace 显示 30% 的 cpu 使用率：

System.String.IndexOf(String, Int32, Int32, StringComparison)

enter image description here

编辑：

    GetStringInBetween(string strBegin, string strEnd, string strSource, bool includeBegin, bool includeEnd)

strBegin = "<td class=\"m92_t_col2\">"
strEnd = "</td>"
strSource = "xxxxxxxx<td class=\"m92_t_col2\">Di. 31.01.12</td>xxxxxxxxxxxxxx
includeBegin = true
includeEnd = true

then i will get result
result[0] = "<td class=\"m92_t_col2\">Di. 31.01.12</td>"

希望这有助于这种方法的作用。尝试在 strBegin 和 strEnd 之间查找字符串...

4

2 回答 2

1

Copying part of the string (your first SubString call) just to keep searching in it is bad for performance. Instead, keep your original input string but use the overload on IndexOf that takes a start index and then adjust your index calculation for extracting the result accordingly.

Also, knowing that these strings are not localized, you might gain some by using an ordinal comparer in IndexOf.

Something along the lines of

public static string[] GetStringInBetween(string strBegin, string strEnd, string strSource, bool includeBegin, bool includeEnd)
{
    string[] result = { "", "" };
    int iIndexOfBegin = strSource.IndexOf(strBegin, StringComparison.Ordinal);

    if (iIndexOfBegin != -1)
    {
        int iEnd = strSource.IndexOf(strEnd, iIndexOfBegin, StringComparison.Ordinal);

        if (iEnd != -1)
        {
            result[0] = strSource.Substring(
                iIndexOfBegin + (includeBegin ? 0 : strBegin.Length), 
                iEnd + (includeEnd ? strEnd.Length : 0) - iIndexOfBegin);

            // advance beyond this segment
            if (iEnd + strEnd.Length < strSource.Length)
                result[1] = strSource.Substring(iEnd + strEnd.Length);
        }
    }

    return result;
}
于 2012-01-26T19:52:14.897 回答
0

对于您的示例输入，您似乎正在使用 HTML 片段。

我建议使用HTML Agility Pack来解析 HTML - 它使用 LINQ to XML 或 XPath 类型语法以易于查询的方式公开结果。它是一个快速高效的库。

于 2012-01-26T19:18:21.577 回答