修改了@Darky711的答案，使用传入的比较类型和匹配框架替换命名和xml注释尽可能接近。

/// <summary>
/// Returns a new string in which all occurrences of a specified string in the current instance are replaced with another 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 occurrances of oldValue.</param>
/// <param name="comparisonType">Type of the comparison.</param>
/// <returns></returns>
public static string Replace(this string str, string oldValue, string @newValue, StringComparison comparisonType)
{
    @newValue = @newValue ?? string.Empty;
    if (string.IsNullOrEmpty(str) || string.IsNullOrEmpty(oldValue) || oldValue.Equals(@newValue, comparisonType))
    {
        return str;
    }
    int foundAt;
    while ((foundAt = str.IndexOf(oldValue, 0, comparisonType)) != -1)
    {
        str = str.Remove(foundAt, oldValue.Length).Insert(foundAt, @newValue);
    }
    return str;
}

.Net Core有这个内置的方法: 替换(String, String, StringComparison) Doc。现在我们可以简单地写: “…”。替换("oldValue"， "newValue"， stringcompare . ordinalignorecase)

您还可以尝试Regex类。

var regex = new regex ("camel"， RegexOptions. var regex = new regex。IgnoreCase); var newSentence =正则表达式。替换(句子，“马”);

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);
}

你可以使用Regex并执行不区分大小写的替换:

class Program
{
    static void Main()
    {
        string input = "hello WoRlD";
        string result = 
           Regex.Replace(input, "world", "csharp", RegexOptions.IgnoreCase);
        Console.WriteLine(result); // prints "hello csharp"
    }
}

使用这个，测试和100%工作!

VB。网

Dim myString As String
Dim oldValue As String
Dim newValue As String

myString = Form1.TextBox1.Text
oldValue = TextBox1.Text
newValue = TextBox2.Text

Dim working As String = myString
Dim index As Integer = working.IndexOf(oldValue, StringComparison.CurrentCultureIgnoreCase)

While index <> -1
    working = working.Remove(index, oldValue.Length)
    working = working.Insert(index, newValue)
    index = index + newValue.Length
    index = working.IndexOf(oldValue, index, StringComparison.CurrentCultureIgnoreCase)
    Form1.TextBox1.Text = working
End While

为c#

private void Button2_Click(System.Object sender, System.EventArgs e)
{
    string myString;
    string oldValue;
    string newValue;

    myString = Form1.TextBox1.Text;
    oldValue = TextBox1.Text;
    newValue = TextBox2.Text;

    string working = myString;
    int index = working.IndexOf(oldValue, StringComparison.CurrentCultureIgnoreCase);

    while (index != -1)
    {
        working = working.Remove(index, oldValue.Length);
        working = working.Insert(index, newValue);
        index = index + newValue.Length;
        index = working.IndexOf(oldValue, index, StringComparison.CurrentCultureIgnoreCase);
        Form1.TextBox1.Text = working;
    }
}