var search = "world";
var replacement = "csharp";
string result = Regex.Replace(
    stringToLookInto,
    Regex.Escape(search), 
    replacement.Replace("$","$$"), 
    RegexOptions.IgnoreCase
);

正则表达式。如果您依赖于可能包含Regex语言元素的用户输入，那么Escape是有用的

更新

多亏了注释，您实际上不必转义替换字符串。

下面是一个测试代码的小工具:

using System;
using System.Text.RegularExpressions;           
public class Program
{
    public static void Main()
    {

        var tests = new[] {
            new { Input="abcdef", Search="abc", Replacement="xyz", Expected="xyzdef" },
            new { Input="ABCdef", Search="abc", Replacement="xyz", Expected="xyzdef" },
            new { Input="A*BCdef", Search="a*bc", Replacement="xyz", Expected="xyzdef" },
            new { Input="abcdef", Search="abc", Replacement="x*yz", Expected="x*yzdef" },       
            new { Input="abcdef", Search="abc", Replacement="$", Expected="$def" },
        };


        foreach(var test in tests){
            var result = ReplaceCaseInsensitive(test.Input, test.Search, test.Replacement);

            Console.WriteLine(
                "Success: {0}, Actual: {1}, {2}",
                result == test.Expected,
                result,
                test
            );

        }


    }

    private static string ReplaceCaseInsensitive(string input, string search, string replacement){
        string result = Regex.Replace(
            input,
            Regex.Escape(search), 
            replacement.Replace("$","$$"), 
            RegexOptions.IgnoreCase
        );
        return result;
    }
}

它的输出是:

Success: True, Actual: xyzdef, { Input = abcdef, Search = abc, Replacement = xyz, Expected = xyzdef } 
Success: True, Actual: xyzdef, { Input = ABCdef, Search = abc, Replacement = xyz, Expected = xyzdef }
Success: True, Actual: xyzdef, { Input = A*BCdef, Search = a*bc, Replacement = xyz, Expected = xyzdef } 
Success: True, Actual: x*yzdef, { Input = abcdef, Search = abc, Replacement = x*yz, Expected = x*yzdef} 
Success: True, Actual: $def, { Input = abcdef, Search = abc, Replacement = $, Expected = $def }

用Regex扩展Petrucio的答案。在搜索字符串上转义，并在Steve B的回答中建议转义匹配的组(和一些小的改变，我的口味):

public static class StringExtensions
{
    public static string ReplaceIgnoreCase(this string str, string from, string to)
    {
        return Regex.Replace(str, Regex.Escape(from), to.Replace("$", "$$"), RegexOptions.IgnoreCase);
    }
}

这将产生以下预期结果:

Console.WriteLine("(heLLo) wOrld".ReplaceIgnoreCase("(hello) world", "Hi $1 Universe")); // Hi $1 Universe
Console.WriteLine("heLLo wOrld".ReplaceIgnoreCase("(hello) world", "Hi $1 Universe"));   // heLLo wOrld

然而，如果不执行转义，您将得到以下结果，这不是String的预期行为。替换是不区分大小写的:

Console.WriteLine("(heLLo) wOrld".ReplaceIgnoreCase_NoEscaping("(hello) world", "Hi $1 Universe")); // (heLLo) wOrld
Console.WriteLine("heLLo wOrld".ReplaceIgnoreCase_NoEscaping("(hello) world", "Hi $1 Universe"));   // Hi heLLo Universe

你可以用微软。VisualBasic命名空间来查找这个帮助函数:

Replace(sourceString, "replacethis", "withthis", , , CompareMethod.Text)

2.5倍比其他正则表达式方法更快和最有效的方法:

/// <summary>
/// Returns a new string in which all occurrences of a specified string in the current instance are replaced with another 
/// specified string according the type of search to use for the specified string.
/// </summary>
/// <param name="str">The string performing the replace method.</param>
/// <param name="oldValue">The string to be replaced.</param>
/// <param name="newValue">The string replace all occurrences of <paramref name="oldValue"/>. 
/// If value is equal to <c>null</c>, than all occurrences of <paramref name="oldValue"/> will be removed from the <paramref name="str"/>.</param>
/// <param name="comparisonType">One of the enumeration values that specifies the rules for the search.</param>
/// <returns>A string that is equivalent to the current string except that all instances of <paramref name="oldValue"/> are replaced with <paramref name="newValue"/>. 
/// If <paramref name="oldValue"/> is not found in the current instance, the method returns the current instance unchanged.</returns>
[DebuggerStepThrough]
public static string Replace(this string str,
    string oldValue, string newValue,
    StringComparison comparisonType)
{

    // Check inputs.
    if (str == null)
    {
        // Same as original .NET C# string.Replace behavior.
        throw new ArgumentNullException(nameof(str));
    }
    if (str.Length == 0)
    {
        // Same as original .NET C# string.Replace behavior.
        return str;
    }
    if (oldValue == null)
    {
        // Same as original .NET C# string.Replace behavior.
        throw new ArgumentNullException(nameof(oldValue));
    }
    if (oldValue.Length == 0)
    {
        // Same as original .NET C# string.Replace behavior.
        throw new ArgumentException("String cannot be of zero length.");
    }
    

    //if (oldValue.Equals(newValue, comparisonType))
    //{
    //This condition has no sense
    //It will prevent method from replacesing: "Example", "ExAmPlE", "EXAMPLE" to "example"
    //return str;
    //}



    // Prepare string builder for storing the processed string.
    // Note: StringBuilder has a better performance than String by 30-40%.
    StringBuilder resultStringBuilder = new StringBuilder(str.Length);



    // Analyze the replacement: replace or remove.
    bool isReplacementNullOrEmpty = string.IsNullOrEmpty(newValue);



    // Replace all values.
    const int valueNotFound = -1;
    int foundAt;
    int startSearchFromIndex = 0;
    while ((foundAt = str.IndexOf(oldValue, startSearchFromIndex, comparisonType)) != valueNotFound)
    {
        
        // Append all characters until the found replacement.
        int charsUntilReplacment = foundAt - startSearchFromIndex;
        bool isNothingToAppend = charsUntilReplacment == 0;
        if (!isNothingToAppend)
        {
            resultStringBuilder.Append(str, startSearchFromIndex, charsUntilReplacment);
        }
        


        // Process the replacement.
        if (!isReplacementNullOrEmpty)
        {
            resultStringBuilder.Append(newValue);
        }
        

        // Prepare start index for the next search.
        // This needed to prevent infinite loop, otherwise method always start search 
        // from the start of the string. For example: if an oldValue == "EXAMPLE", newValue == "example"
        // and comparisonType == "any ignore case" will conquer to replacing:
        // "EXAMPLE" to "example" to "example" to "example" … infinite loop.
        startSearchFromIndex = foundAt + oldValue.Length;
        if (startSearchFromIndex == str.Length)
        {
            // It is end of the input string: no more space for the next search.
            // The input string ends with a value that has already been replaced. 
            // Therefore, the string builder with the result is complete and no further action is required.
            return resultStringBuilder.ToString();
        }
    }
    

    // Append the last part to the result.
    int charsUntilStringEnd = str.Length - startSearchFromIndex;
    resultStringBuilder.Append(str, startSearchFromIndex, charsUntilStringEnd);


    return resultStringBuilder.ToString();

}

注意:忽略case == StringComparison。OrdinalIgnoreCase作为stringcomparisontype的参数。它是替换所有值的最快、不区分大小写的方法。

该方法的优点:

High CPU and MEMORY efficiency; It is the fastest solution, 2.5 times faster than other's methods with regular expressions (proof in the end); Suitable for removing parts from the input string (set newValue to null), optimized for this; Same as original .NET C# string.Replace behavior, same exceptions; Well commented, easy to understand; Simpler – no regular expressions. Regular expressions are always slower because of their versatility (even compiled); This method is well tested and there are no hidden flaws like infinite loop in other's solutions, even highly rated:

@AsValeO: Not适用于Regex语言元素，所以它不是 普遍的方法

这段代码有问题。如果文本为new 是文本的超集，这样可以产生无限循环。

防基准测试:这个解决方案比@Steve B.的regex快2.59倍，代码:

// Results:
// 1/2. Regular expression solution: 4486 milliseconds
// 2/2. Current solution: 1727 milliseconds — 2.59X times FASTER! than regex!

// Notes: the test was started 5 times, the result is an average; release build.

const int benchmarkIterations = 1000000;
const string sourceString = "aaaaddsdsdsdsdsd";
const string oldValue = "D";
const string newValue = "Fod";
long totalLenght = 0;

Stopwatch regexStopwatch = Stopwatch.StartNew();
string tempString1;
for (int i = 0; i < benchmarkIterations; i++)
{
    tempString1 = sourceString;
    tempString1 = ReplaceCaseInsensitive(tempString1, oldValue, newValue);

    totalLenght = totalLenght + tempString1.Length;
}
regexStopwatch.Stop();



Stopwatch currentSolutionStopwatch = Stopwatch.StartNew();
string tempString2;
for (int i = 0; i < benchmarkIterations; i++)
{
    tempString2 = sourceString;
    tempString2 = tempString2.Replace(oldValue, newValue,
        StringComparison.OrdinalIgnoreCase);

    totalLenght = totalLenght + tempString2.Length;
}
currentSolutionStopwatch.Stop();

原创创意- @Darky711;感谢@ miner的StringBuilder。

我写了扩展方法:

public static string ReplaceIgnoreCase(this string source, string oldVale, string newVale)
    {
        if (source.IsNullOrEmpty() || oldVale.IsNullOrEmpty())
            return source;

        var stringBuilder = new StringBuilder();
        string result = source;

        int index = result.IndexOf(oldVale, StringComparison.InvariantCultureIgnoreCase);

        while (index >= 0)
        {
            if (index > 0)
                stringBuilder.Append(result.Substring(0, index));

            if (newVale.IsNullOrEmpty().IsNot())
                stringBuilder.Append(newVale);

            stringBuilder.Append(result.Substring(index + oldVale.Length));

            result = stringBuilder.ToString();

            index = result.IndexOf(oldVale, StringComparison.InvariantCultureIgnoreCase);
        }

        return result;
    }

我在前面的扩展方法中使用了两个额外的扩展方法:

    public static bool IsNullOrEmpty(this string value)
    {
        return string.IsNullOrEmpty(value);
    }

    public static bool IsNot(this bool val)
    {
        return val == false;
    }

下面的函数是从字符串集中删除所有匹配的单词(this)。作者:Ravikant Sonare。

private static void myfun()
{
    string mystring = "thiTHISThiss This THIS THis tThishiThiss. Box";
    var regex = new Regex("this", RegexOptions.IgnoreCase);
    mystring = regex.Replace(mystring, "");
    string[] str = mystring.Split(' ');
    for (int i = 0; i < str.Length; i++)
    {
        if (regex.IsMatch(str[i].ToString()))
        {
            mystring = mystring.Replace(str[i].ToString(), string.Empty);

        }
    }
    Console.WriteLine(mystring);
}