public static string Format(string formatString, object obj)
{
var sb = new StringBuilder();
bool inBrace = false;
var token = new StringBuilder();
var reader = new StringReader(formatString);
int ich;
while ((ich = reader.Read()) >= 0) {
char ch = (char)ich;
int inext = reader.Peek();
char next = inext >= 0 ? (char)inext : (char)0;
switch (ch) {
case '{':
if (next == '{') {
reader.Read();
sb.Append(ch);
} else {
token.Clear();
inBrace = true;
}
break;
case '}':
if (next == '}') {
reader.Read();
sb.Append(ch);
} else {
inBrace = false;
string separator = "";
if (next == '[') {
reader.Read(); // read the [
separator = reader.ReadUntilNext(']');
}
sb.Append(SubstituteToken(token.ToString(), obj, separator));
}
break;
default:
if (inBrace) {
token.Append(ch);
} else {
sb.Append(ch);
}
break;
}
}
return sb.ToString();
}