docs/fundamentals/runtime-libraries/snippets/System/Double/Overview/csharp/source.cs - main - aprogrammer/dotnet-docs

docs/fundamentals/runtime-libraries/snippets/System/Double/Overview/csharp/source.cs
391 строка8 KB
Genevieve Warren
Add remarks for core types (#38970)
05 янв 2024, 22:14
05 янв 2024, 22:1471d1377
using System;
using System.Globalization;

namespace Snippets {
	class Launcher {
		static void Main(string[] args)
		{
			Temperature t1 = Temperature.Parse("20'F", NumberStyles.Float, null);
			Console.WriteLine( t1.ToString("F", null) );

			string str1 = t1.ToString("C", null);
			Console.WriteLine( str1 );

			Temperature t2 = Temperature.Parse(str1, NumberStyles.Float, null);
			Console.WriteLine( t2.ToString("F", null) );

			Console.WriteLine( t1.CompareTo(t2) );

			Temperature t3 = Temperature.Parse("20'C", NumberStyles.Float, null);
			Console.WriteLine( t3.ToString("F", null) );

			Console.WriteLine( t1.CompareTo(t3) );
		}
	}
	//<snippet1>
	// The Temperature class stores the temperature as a Double
	// and delegates most of the functionality to the Double
	// implementation.
	public class Temperature : IComparable, IFormattable
    {
		// IComparable.CompareTo implementation.
		public int CompareTo(object obj) {
            if (obj == null) return 1;

			Temperature temp = obj as Temperature;
            if (obj != null)
				return m_value.CompareTo(temp.m_value);
			else
     			throw new ArgumentException("object is not a Temperature");	
		}

		// IFormattable.ToString implementation.
		public string ToString(string format, IFormatProvider provider) {
			if( format != null ) {
				if( format.Equals("F") ) {
					return String.Format("{0}'F", this.Value.ToString());
				}
				if( format.Equals("C") ) {
					return String.Format("{0}'C", this.Celsius.ToString());
				}
			}

			return m_value.ToString(format, provider);
		}

		// Parses the temperature from a string in the form
		// [ws][sign]digits['F|'C][ws]
		public static Temperature Parse(string s, NumberStyles styles, IFormatProvider provider) {
			Temperature temp = new Temperature();

			if( s.TrimEnd(null).EndsWith("'F") ) {
				temp.Value = Double.Parse( s.Remove(s.LastIndexOf('\''), 2), styles, provider);
			}
			else if( s.TrimEnd(null).EndsWith("'C") ) {
				temp.Celsius = Double.Parse( s.Remove(s.LastIndexOf('\''), 2), styles, provider);
			}
			else {
				temp.Value = Double.Parse(s, styles, provider);
			}

			return temp;
		}

		// The value holder
		protected double m_value;

		public double Value {
			get {
				return m_value;
			}
			set {
				m_value = value;
			}
		}

		public double Celsius {
			get {
				return (m_value-32.0)/1.8;
			}
			set {
				m_value = 1.8*value+32.0;
			}
		}
	}
	//</snippet1>
}

namespace Snippets2 {
	//<snippet2>
	public class Temperature {
		public static double MinValue {
			get {
				return Double.MinValue;
			}
		}

		public static double MaxValue {
			get {
				return Double.MaxValue;
			}
		}

		// The value holder
		protected double m_value;

		public double Value {
			get {
				return m_value;
			}
			set {
				m_value = value;
			}
		}

		public double Celsius {
			get {
				return (m_value-32.0)/1.8;
			}
			set {
				m_value = 1.8*value+32.0;
			}
		}
	}
	//</snippet2>
}

namespace Snippets3 {
	//<snippet3>
	public class Temperature : IComparable
    {
		// IComparable.CompareTo implementation.
		public int CompareTo(object obj) {
            if (obj == null) return 1;

			Temperature temp = obj as Temperature;
            if (obj != null)
				return m_value.CompareTo(temp.m_value);
			else
     			throw new ArgumentException("object is not a Temperature");	
		}

		// The value holder
		protected double m_value;

		public double Value {
			get {
				return m_value;
			}
			set {
				m_value = value;
			}
		}

		public double Celsius {
			get {
				return (m_value-32.0)/1.8;
			}
			set {
				m_value = 1.8*value+32.0;
			}
		}
	}
	//</snippet3>
}

namespace Snippets4 {
	//<snippet4>
	public class Temperature : IFormattable {
		// IFormattable.ToString implementation.
		public string ToString(string format, IFormatProvider provider) {
			if( format != null ) {
				if( format.Equals("F") ) {
					return String.Format("{0}'F", this.Value.ToString());
				}
				if( format.Equals("C") ) {
					return String.Format("{0}'C", this.Celsius.ToString());
				}
			}

			return m_value.ToString(format, provider);
		}

		// The value holder
		protected double m_value;

		public double Value {
			get {
				return m_value;
			}
			set {
				m_value = value;
			}
		}

		public double Celsius {
			get {
				return (m_value-32.0)/1.8;
			}
			set {
				m_value = 1.8*value+32.0;
			}
		}
	}
	//</snippet4>
}
namespace Snippets5 {
	//<snippet5>
	public class Temperature {
		// Parses the temperature from a string in form
		// [ws][sign]digits['F|'C][ws]
		public static Temperature Parse(string s) {
			Temperature temp = new Temperature();

			if( s.TrimEnd(null).EndsWith("'F") ) {
				temp.Value = Double.Parse( s.Remove(s.LastIndexOf('\''), 2) );
			}
			else if( s.TrimEnd(null).EndsWith("'C") ) {
				temp.Celsius = Double.Parse( s.Remove(s.LastIndexOf('\''), 2) );
			}
			else {
				temp.Value = Double.Parse(s);
			}

			return temp;
		}

		// The value holder
		protected double m_value;

		public double Value {
			get {
				return m_value;
			}
			set {
				m_value = value;
			}
		}

		public double Celsius {
			get {
				return (m_value-32.0)/1.8;
			}
			set {
				m_value = 1.8*value+32.0;
			}
		}
	}
	//</snippet5>
}
namespace Snippets6 {
	//<snippet6>
	public class Temperature {
		// Parses the temperature from a string in form
		// [ws][sign]digits['F|'C][ws]
		public static Temperature Parse(string s, IFormatProvider provider) {
			Temperature temp = new Temperature();

			if( s.TrimEnd(null).EndsWith("'F") ) {
				temp.Value = Double.Parse( s.Remove(s.LastIndexOf('\''), 2), provider);
			}
			else if( s.TrimEnd(null).EndsWith("'C") ) {
				temp.Celsius = Double.Parse( s.Remove(s.LastIndexOf('\''), 2), provider);
			}
			else {
				temp.Value = Double.Parse(s, provider);
			}

			return temp;
		}

		// The value holder
		protected double m_value;

		public double Value {
			get {
				return m_value;
			}
			set {
				m_value = value;
			}
		}

		public double Celsius {
			get {
				return (m_value-32.0)/1.8;
			}
			set {
				m_value = 1.8*value+32.0;
			}
		}
	}
	//</snippet6>
}
namespace Snippets7 {
	//<snippet7>
	public class Temperature {
		// Parses the temperature from a string in form
		// [ws][sign]digits['F|'C][ws]
		public static Temperature Parse(string s, NumberStyles styles) {
			Temperature temp = new Temperature();

			if( s.TrimEnd(null).EndsWith("'F") ) {
				temp.Value = Double.Parse( s.Remove(s.LastIndexOf('\''), 2), styles);
			}
			else if( s.TrimEnd(null).EndsWith("'C") ) {
				temp.Celsius = Double.Parse( s.Remove(s.LastIndexOf('\''), 2), styles);
			}
			else {
				temp.Value = Double.Parse(s, styles);
			}

			return temp;
		}

		// The value holder
		protected double m_value;

		public double Value {
			get {
				return m_value;
			}
			set {
				m_value = value;
			}
		}

		public double Celsius {
			get {
				return (m_value-32.0)/1.8;
			}
			set {
				m_value = 1.8*value+32.0;
			}
		}
	}
	//</snippet7>
}
namespace Snippets8 {
	//<snippet8>
	public class Temperature {
		// Parses the temperature from a string in form
		// [ws][sign]digits['F|'C][ws]
		public static Temperature Parse(string s, NumberStyles styles, IFormatProvider provider) {
			Temperature temp = new Temperature();

			if( s.TrimEnd(null).EndsWith("'F") ) {
				temp.Value = Double.Parse( s.Remove(s.LastIndexOf('\''), 2), styles, provider);
			}
			else if( s.TrimEnd(null).EndsWith("'C") ) {
				temp.Celsius = Double.Parse( s.Remove(s.LastIndexOf('\''), 2), styles, provider);
			}
			else {
				temp.Value = Double.Parse(s, styles, provider);
			}

			return temp;
		}

		// The value holder
		protected double m_value;

		public double Value {
			get {
				return m_value;
			}
			set {
				m_value = value;
			}
		}

		public double Celsius {
			get {
				return (m_value-32.0)/1.8;
			}
			set {
				m_value = 1.8*value+32.0;
			}
		}
	}
	//</snippet8>
}