我如何一气呵成执行若干字符串替换？ [英] How do I perform several string replacements in one go?

问题描述

我写在C＃中的应用程序，它允许用户根据文件名进行数据库查询。

I'm writing an app in C# which allows the user to perform database queries based on file names.

我使用了 Regex.Replace（字符串，MatchEvaluator）过载进行替代，因为我希望用户能够有替换字符串如 SELECT * FROM表WHERE record_id =修剪（$ 1）尽管我们正在使用不支持像修剪功能（），数据库

I'm using the Regex.Replace(string, MatchEvaluator) overload to perform replacements, because I want the user to be able to have replacement strings like SELECT * FROM table WHERE record_id = trim($1) even though the DB we're using doesn't support functions like trim().

我不希望是做了一系列的更新换代，其中，如果$ 1的值包含$ 2，无论是更换发生。我如何一气呵成执行若干字符串替换？我知道PHP的str_replace函数支持数组作为参数;是不是也有类似功能的C＃？

What I don't want is to do a series of replacements where if the value of $1 contains "$2", both replacements occur. How do I perform several string replacements in one go? I know PHP's str_replace supports arrays as arguments; is there a similar function for C#?

推荐答案

没有什么内置的，但你可以尝试这样的：

There's nothing built-in, but you could try something like this:

string foo = "the fish is swimming in the dish";

string bar = foo.ReplaceAll(
    new[] { "fish", "is", "swimming", "in", "dish" },
    new[] { "dog", "lies", "sleeping", "on", "log" });

Console.WriteLine(bar);    // the dog lies sleeping on the log

// ...

public static class StringExtensions
{
    public static string ReplaceAll(
        this string source, string[] oldValues, string[] newValues)
    {
        // error checking etc removed for brevity

        string pattern =
            string.Join("|", oldValues.Select(Regex.Escape).ToArray());

        return Regex.Replace(source, pattern, m =>
            {
                int index = Array.IndexOf(oldValues, m.Value);
                return newValues[index];
            });
    }
}

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