Question

我正在创建自己的论坛。我引用邮件时遇到问题。我知道如何在文本框中添加引用消息，但我无法弄清楚如何在发布后从字符串中提取值。在文本框中，我有这样的事情：

[quote IdPost=8] Some quoting text [/quote]

[quote IdPost=15] Second quoting text [/quote]

你能说出提取所有＆＃34; IdPost＆＃34;的最简单方法是什么？发布表格后来自字符串的数字？

Answer 1

使用正则表达式

@"\[quote IdPost=(\d+)\]"

类似

Regex reg = new Regex(@"\[quote IdPost=(\d+)\]");
foreach (Match match in reg.Matches(text))
{
   ...
}

Answer 2

我不确切知道你的字符串是什么，但这是一个使用Substring的无正则表达式解决方案：

using System;

public class Program
{
    public static void Main()
    {
        string source = "[quote IdPost=8] Some quoting text [/quote]";

        Console.WriteLine(ExtractNum(source, "=", "]"));
        Console.WriteLine(ExtractNum2(source, "[quote IdPost="));
    }

    public static string ExtractNum(string source, string start, string end)
    {
        int index = source.IndexOf(start) + start.Length;
        return source.Substring(index, source.IndexOf(end) - index);
    }

    // just another solution for fun
    public static string ExtractNum2(string source, string junk)
    {
        source = source.Substring(junk.Length, source.Length - junk.Length); // erase start
        return source.Remove(source.IndexOf(']')); // erase end
    }
}

Demo on DotNetFiddle

Answer 3

var originalstring = "[quote IdPost=8] Some quoting text [/quote]";

//"[quote IdPost=" and "8] Some quoting text [/quote]"
var splits = originalstring.Split('=');
if(splits.Count() == 2)
{
    //"8" and "] Some quoting text [/quote]"
    var splits2 = splits[1].Split(']');
    int id;
    if(int.TryParse(splits2[0], out id))
    {
        return id;
    }
}

使用C＃从字符串中提取多个值

3 个答案: