| Method | Meaning |
| public int CompareTo(object v) | Returns zero if the values are equal. Returns a negative value if the invoking object has a lower value. Returns a positive value if the invoking object has a greater value. |
| public override bool Equals(object v) | Returns true if the value of the invoking object equals the value of v. |
| public override int GetHashCode() | Returns the hash code. |
| public TypeCode GetTypeCode() | Returns the TypeCode enumeration value for Double, which is TypeCode.Double. |
| public static bool IsInfinity(double v) | Is v infinit (either positive or negative). |
| public static bool IsNaN(double v) | Is v is a number. |
| public static bool IsPositiveInfinity(double v) | Does v represent positive infinity. |
| public static bool IsNegativeInfinity(double v) | Returns true if v represents negative infinity. Otherwise, returns false. |
| public static double Parse(string str) | Parse the string. |
| public static doubleParse(string str,IFormatProvider fmtpvdr) | Parse the string using the culture-specific information provided by fmtpvdr. |
| public static doubleParse(string str, NumberStyles styles) | Parse the string using the style information provided by styles. |
| public static doubleParse(string str,NumberStyles styles,IFormatProvider fmtpvdr) | Returns the binary equivalent of the numeric string in str using the style information provided by styles and the culture-specific format information provided by fmtpvdr. |
| public override string ToString() | Convert value to string. |
| public string ToString(string format) | Convert value to string by the format. |
| public stringToString(IFormatProvider fmtpvdr) | Convert value to string by the culture-specific information specified in fmtpvdr. |
| public stringToString(string format,IFormatProvider fmtpvdr) | Convert value to string by the culture-specific information specified in fmtpvdr and the format specified by format. |
| Field | Meaning |
| public const double Epsilon | The smallest non-zero positive value. |
| public const double MaxValue | The largest value that a double can hold. |
| public const double MinValue | The smallest value that a double can hold. |
| public const double NaN | A value that is not a number. |
| public const double NegativeInfinity | A value representing negative infinity. |
| public const double PositiveInfinity | A value representing positive infinity. |