Answer to Question #4862 in C# for Olivia Weizman

Question

Hi,
I have a homework to do in C Sharp. My teacher want us to replace a string x by a string y in a string p WITHOUT using the System.Replace thing. Please help me and know that we didnt learn lot. Help me using very basic method. Thnxxxxxx

Answer 1

static public string ReplaceString(string str, string oldValue, string newValue, StringComparison comparison)
{
StringBuilder sb = new StringBuilder();

int previousIndex = 0;
int index = str.IndexOf(oldValue, comparison);
while (index != -1)
{
sb.Append(str.Substring(previousIndex, index - previousIndex));
sb.Append(newValue);
index += oldValue.Length;

previousIndex = index;
index = str.IndexOf(oldValue, index,
comparison);
}
sb.Append(str.Substring(previousIndex));

return sb.ToString();
}