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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace System {
using System.Diagnostics.Contracts;
using System.Threading;
// The IConvertible interface represents an object that contains a value. This
// interface is implemented by the following types in the System namespace:
// Boolean, Char, SByte, Byte, Int16, UInt16, Int32, UInt32, Int64, UInt64,
// Single, Double, Decimal, DateTime, TimeSpan, and String. The interface may
// be implemented by other types that are to be considered values. For example,
// a library of nullable database types could implement IConvertible.
//
// Note: The interface was originally proposed as IValue.
//
// The implementations of IConvertible provided by the System.XXX value classes
// simply forward to the appropriate Value.ToXXX(YYY) methods (a description of
// the Value class follows below). In cases where a Value.ToXXX(YYY) method
// does not exist (because the particular conversion is not supported), the
// IConvertible implementation should simply throw an InvalidCastException.
[CLSCompliant(false)]
[System.Runtime.InteropServices.ComVisible(true)]
public interface IConvertible
{
// Returns the type code of this object. An implementation of this method
// must not return TypeCode.Empty (which represents a null reference) or
// TypeCode.Object (which represents an object that doesn't implement the
// IConvertible interface). An implementation of this method should return
// TypeCode.DBNull if the value of this object is a database null. For
// example, a nullable integer type should return TypeCode.DBNull if the
// value of the object is the database null. Otherwise, an implementation
// of this method should return the TypeCode that best describes the
// internal representation of the object.
TypeCode GetTypeCode();
// The ToXXX methods convert the value of the underlying object to the
// given type. If a particular conversion is not supported, the
// implementation must throw an InvalidCastException. If the value of the
// underlying object is not within the range of the target type, the
// implementation must throw an OverflowException. The
// IFormatProvider will be used to get a NumberFormatInfo or similar
// appropriate service object, and may safely be null.
bool ToBoolean(IFormatProvider provider);
char ToChar(IFormatProvider provider);
sbyte ToSByte(IFormatProvider provider);
byte ToByte(IFormatProvider provider);
short ToInt16(IFormatProvider provider);
ushort ToUInt16(IFormatProvider provider);
int ToInt32(IFormatProvider provider);
uint ToUInt32(IFormatProvider provider);
long ToInt64(IFormatProvider provider);
ulong ToUInt64(IFormatProvider provider);
float ToSingle(IFormatProvider provider);
double ToDouble(IFormatProvider provider);
Decimal ToDecimal(IFormatProvider provider);
DateTime ToDateTime(IFormatProvider provider);
String ToString(IFormatProvider provider);
Object ToType(Type conversionType, IFormatProvider provider);
}
}
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