System.Runtime.Serialization.Json.JsonReader.ReadNumber C# (CSharp) Метод

		void ReadNumber (int ch)
		{
			elements.Push (new ElementInfo (next_element, "number"));
			content_stored = true;

			int init = ch;
			int prev;
			bool floating = false, exp = false;

			StringBuilder sb = new StringBuilder ();
			bool cont = true;
			do {
				sb.Append ((char) ch);
				prev = ch;
				ch = ReadChar ();

				if (prev == '-' && !IsNumber (ch)) // neither '.', '-' or '+' nor anything else is valid
					throw XmlError ("Invalid JSON number");

				switch (ch) {
				case 'e':
				case 'E':
					if (exp)
						throw XmlError ("Invalid JSON number token. Either 'E' or 'e' must not occur more than once");
					if (!IsNumber (prev))
						throw XmlError ("Invalid JSON number token. only a number is valid before 'E' or 'e'");
					exp = true;
					break;
				case '.':
					if (floating)
						throw XmlError ("Invalid JSON number token. '.' must not occur twice");
					if (exp)
						throw XmlError ("Invalid JSON number token. '.' must not occur after 'E' or 'e'");
					floating = true;
					break;
				case '+':
				case '-':
					if (prev == 'E' || prev == 'e')
						break;
					goto default;
				default:
					if (!IsNumber (ch)) {
						PushbackChar (ch);
						cont = false;
					}
					break;
				}
			} while (cont);

			if (!IsNumber (prev)) // only number is valid at the end
				throw XmlError ("Invalid JSON number");

			simple_value = sb.ToString ();

			if (init == '0' && !floating && !exp && simple_value != "0")
				throw XmlError ("Invalid JSON number");
		}