String.Replace ignoring case

Question

I have a string called \"hello world\"

I need to replace the word \"world\" to \"csharp\"

for this I use:

string.Replace(\"World\", \"csharp\         


        

Answer 1

Modified @Darky711's answer to use the passed in comparison type and match the framework replace naming and xml comments as closely as possible.

/// 

/// Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string.
/// 
/// The string performing the replace method.
/// The string to be replaced.
/// The string replace all occurrances of oldValue.
/// Type of the comparison.
/// 
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;
}