IConvertible 인터페이스
구현하는 참조의 값 또는 값 형식을 같은 값의 공용 언어 런타임 형식으로 변환하는 메서드를 정의합니다.
네임스페이스: System
어셈블리: mscorlib(mscorlib.dll)
구문
‘선언
<ComVisibleAttribute(True)> _
<CLSCompliantAttribute(False)> _
Public Interface IConvertible
‘사용 방법
Dim instance As IConvertible
[ComVisibleAttribute(true)]
[CLSCompliantAttribute(false)]
public interface IConvertible
[ComVisibleAttribute(true)]
[CLSCompliantAttribute(false)]
public interface class IConvertible
/** @attribute ComVisibleAttribute(true) */
/** @attribute CLSCompliantAttribute(false) */
public interface IConvertible
ComVisibleAttribute(true)
CLSCompliantAttribute(false)
public interface IConvertible
설명
이 인터페이스는 구현하는 형식 인스턴스의 값을 같은 값의 공용 언어 런타임 형식으로 변환하는 메서드를 제공합니다. 해당 공용 언어 런타임 형식으로는 Boolean, SByte, Byte, Int16, UInt16, Int32, UInt32, Int64, UInt64, Single, Double, Decimal, DateTime, Char 및 String이 있습니다.
공용 언어 런타임 형식으로 의미 있는 변환이 수행되지 않으면 특정 인터페이스 메서드 구현이 InvalidCastException을 throw합니다. 예를 들어, 이 인터페이스가 부울 형식으로 구현된 경우에는 부울 형식에 해당하는 의미 있는 DateTime이 없으므로 ToDateTime 메서드가 예외를 throw합니다.
일반적으로 공용 언어 런타임은 Convert 클래스를 통해 IConvertible 인터페이스를 노출합니다. 또한 공용 언어 런타임은 명시적 인터페이스 구현에서 내부적으로 IConvertible 인터페이스를 사용하여 Convert 클래스와 기본 공용 언어 런타임 형식에서의 변환을 지원하는 데 사용되는 코드를 단순화합니다.
.NET Framework는 IConvertible 인터페이스 이외에도 사용자 정의 데이터 형식을 다른 데이터 형식으로 변환하는 형식 변환기라는 클래스를 제공합니다. 자세한 내용은 일반화된 형식 변환 항목을 참조하십시오.
예제
다음 코드 예제에서는 복합 숫자 클래스에 대한 IConvertible을 구현하여 먼저 Double로 캐스팅한 다음 Double에서 정적 Convert 멤버를 호출하도록 하는 방법을 보여 줍니다.
Imports System
Module Module1
Public Class Complex
Implements IConvertible
Private x As Double
Private y As Double
Public Sub New(ByVal x As Double, ByVal y As Double)
Me.x = x
Me.y = y
End Sub 'New
Public Function GetTypeCode() As TypeCode Implements IConvertible.GetTypeCode
Return TypeCode.Object
End Function
Function ToBoolean(ByVal provider As IFormatProvider) As Boolean Implements IConvertible.ToBoolean
If x <> 0 Or y <> 0 Then
Return True
Else
Return False
End If
End Function
Function GetDoubleValue() As Double
Return Math.Sqrt((x * x + y * y))
End Function
Function ToByte(ByVal provider As IFormatProvider) As Byte Implements IConvertible.ToByte
Return Convert.ToByte(GetDoubleValue())
End Function
Function ToChar(ByVal provider As IFormatProvider) As Char Implements IConvertible.ToChar
Return Convert.ToChar(GetDoubleValue())
End Function
Function ToDateTime(ByVal provider As IFormatProvider) As DateTime Implements IConvertible.ToDateTime
Return Convert.ToDateTime(GetDoubleValue())
End Function
Function ToDecimal(ByVal provider As IFormatProvider) As Decimal Implements IConvertible.ToDecimal
Return Convert.ToDecimal(GetDoubleValue())
End Function
Function ToDouble(ByVal provider As IFormatProvider) As Double Implements IConvertible.ToDouble
Return GetDoubleValue()
End Function
Function ToInt16(ByVal provider As IFormatProvider) As Short Implements IConvertible.ToInt16
Return Convert.ToInt16(GetDoubleValue())
End Function
Function ToInt32(ByVal provider As IFormatProvider) As Integer Implements IConvertible.ToInt32
Return Convert.ToInt32(GetDoubleValue())
End Function
Function ToInt64(ByVal provider As IFormatProvider) As Long Implements IConvertible.ToInt64
Return Convert.ToInt64(GetDoubleValue())
End Function
Function ToSByte(ByVal provider As IFormatProvider) As SByte Implements IConvertible.ToSByte
Return Convert.ToSByte(GetDoubleValue())
End Function
Function ToSingle(ByVal provider As IFormatProvider) As Single Implements IConvertible.ToSingle
Return Convert.ToSingle(GetDoubleValue())
End Function
Overloads Function ToString(ByVal provider As IFormatProvider) As String Implements IConvertible.ToString
Return "( " + x.ToString() + " , " + y.ToString() + " )"
End Function
Function ToType(ByVal conversionType As Type, ByVal provider As IFormatProvider) As Object Implements IConvertible.ToType
Return Convert.ChangeType(GetDoubleValue(), conversionType)
End Function
Function ToUInt16(ByVal provider As IFormatProvider) As UInt16 Implements IConvertible.ToUInt16
Return Convert.ToUInt16(GetDoubleValue())
End Function
Function ToUInt32(ByVal provider As IFormatProvider) As UInt32 Implements IConvertible.ToUInt32
Return Convert.ToUInt32(GetDoubleValue())
End Function
Function ToUInt64(ByVal provider As IFormatProvider) As UInt64 Implements IConvertible.ToUInt64
Return Convert.ToUInt64(GetDoubleValue())
End Function
End Class
Sub Main()
Dim testComplex As New Complex(4, 7)
WriteObjectInfo(testComplex)
WriteObjectInfo(Convert.ToBoolean(testComplex))
WriteObjectInfo(Convert.ToDecimal(testComplex))
WriteObjectInfo(Convert.ToString(testComplex))
End Sub
Sub WriteObjectInfo(ByVal testObject As Object)
Dim typeCode As TypeCode = Type.GetTypeCode(testObject.GetType())
Select Case typeCode
Case typeCode.Boolean
Console.WriteLine("Boolean: {0}", testObject)
Case typeCode.Double
Console.WriteLine("Double: {0}", testObject)
Case Else
Console.WriteLine("{0}: {1}", typeCode.ToString(), testObject)
End Select
End Sub
End Module
using System;
namespace ConsoleApplication2
{
/// Class that implements IConvertible
class Complex : IConvertible
{
double x;
double y;
public Complex(double x, double y)
{
this.x = x;
this.y = y;
}
public TypeCode GetTypeCode()
{
return TypeCode.Object;
}
bool IConvertible.ToBoolean(IFormatProvider provider)
{
if( (x != 0.0) || (y != 0.0) )
return true;
else
return false;
}
double GetDoubleValue()
{
return Math.Sqrt(x*x + y*y);
}
byte IConvertible.ToByte(IFormatProvider provider)
{
return Convert.ToByte(GetDoubleValue());
}
char IConvertible.ToChar(IFormatProvider provider)
{
return Convert.ToChar(GetDoubleValue());
}
DateTime IConvertible.ToDateTime(IFormatProvider provider)
{
return Convert.ToDateTime(GetDoubleValue());
}
decimal IConvertible.ToDecimal(IFormatProvider provider)
{
return Convert.ToDecimal(GetDoubleValue());
}
double IConvertible.ToDouble(IFormatProvider provider)
{
return GetDoubleValue();
}
short IConvertible.ToInt16(IFormatProvider provider)
{
return Convert.ToInt16(GetDoubleValue());
}
int IConvertible.ToInt32(IFormatProvider provider)
{
return Convert.ToInt32(GetDoubleValue());
}
long IConvertible.ToInt64(IFormatProvider provider)
{
return Convert.ToInt64(GetDoubleValue());
}
sbyte IConvertible.ToSByte(IFormatProvider provider)
{
return Convert.ToSByte(GetDoubleValue());
}
float IConvertible.ToSingle(IFormatProvider provider)
{
return Convert.ToSingle(GetDoubleValue());
}
string IConvertible.ToString(IFormatProvider provider)
{
return "( " + x.ToString() + " , " + y.ToString() + " )";
}
object IConvertible.ToType(Type conversionType, IFormatProvider provider)
{
return Convert.ChangeType(GetDoubleValue(),conversionType);
}
ushort IConvertible.ToUInt16(IFormatProvider provider)
{
return Convert.ToUInt16(GetDoubleValue());
}
uint IConvertible.ToUInt32(IFormatProvider provider)
{
return Convert.ToUInt32(GetDoubleValue());
}
ulong IConvertible.ToUInt64(IFormatProvider provider)
{
return Convert.ToUInt64(GetDoubleValue());
}
}
/// <summary>
/// Summary description for Class1.
/// </summary>
class Class1
{
static void Main(string[] args)
{
Complex testComplex = new Complex(4,7);
WriteObjectInfo(testComplex);
WriteObjectInfo(Convert.ToBoolean(testComplex));
WriteObjectInfo(Convert.ToDecimal(testComplex));
WriteObjectInfo(Convert.ToString(testComplex));
}
static void WriteObjectInfo(object testObject)
{
TypeCode typeCode = Type.GetTypeCode( testObject.GetType() );
switch( typeCode )
{
case TypeCode.Boolean:
Console.WriteLine("Boolean: {0}", testObject);
break;
case TypeCode.Double:
Console.WriteLine("Double: {0}", testObject);
break;
default:
Console.WriteLine("{0}: {1}", typeCode.ToString(), testObject);
break;
}
}
}
}
#using <System.dll>
using namespace System;
/// Class that implements IConvertible
ref class Complex: public IConvertible
{
private:
double x;
double y;
public:
Complex( double x, double y )
{
this->x = x;
this->y = y;
}
virtual TypeCode GetTypeCode()
{
return TypeCode::Object;
}
virtual bool ToBoolean( IFormatProvider^ /*provider*/ ) = IConvertible::ToBoolean
{
if ( (x != 0.0) || (y != 0.0) )
return true;
else
return false;
}
double GetDoubleValue()
{
return Math::Sqrt( x * x + y * y );
}
virtual Byte ToByte( IFormatProvider^ /*provider*/ ) = IConvertible::ToByte
{
return Convert::ToByte( GetDoubleValue() );
}
virtual Char ToChar( IFormatProvider^ /*provider*/ ) = IConvertible::ToChar
{
return Convert::ToChar( GetDoubleValue() );
}
virtual DateTime ToDateTime( IFormatProvider^ /*provider*/ ) = IConvertible::ToDateTime
{
return Convert::ToDateTime( GetDoubleValue() );
}
virtual Decimal ToDecimal( IFormatProvider^ /*provider*/ ) = IConvertible::ToDecimal
{
return Convert::ToDecimal( GetDoubleValue() );
}
virtual double ToDouble( IFormatProvider^ /*provider*/ ) = IConvertible::ToDouble
{
return GetDoubleValue();
}
virtual short ToInt16( IFormatProvider^ /*provider*/ ) = IConvertible::ToInt16
{
return Convert::ToInt16( GetDoubleValue() );
}
virtual int ToInt32( IFormatProvider^ /*provider*/ ) = IConvertible::ToInt32
{
return Convert::ToInt32( GetDoubleValue() );
}
virtual Int64 ToInt64( IFormatProvider^ /*provider*/ ) = IConvertible::ToInt64
{
return Convert::ToInt64( GetDoubleValue() );
}
virtual signed char ToSByte( IFormatProvider^ /*provider*/ ) = IConvertible::ToSByte
{
return Convert::ToSByte( GetDoubleValue() );
}
virtual float ToSingle( IFormatProvider^ /*provider*/ ) = IConvertible::ToSingle
{
return Convert::ToSingle( GetDoubleValue() );
}
virtual String^ ToString( IFormatProvider^ /*provider*/ ) = IConvertible::ToString
{
return String::Format( "( {0} , {1} )", x, y );
}
virtual Object^ ToType( Type^ conversionType, IFormatProvider^ /*provider*/ ) = IConvertible::ToType
{
return Convert::ChangeType( GetDoubleValue(), conversionType );
}
virtual UInt16 ToUInt16( IFormatProvider^ /*provider*/ ) = IConvertible::ToUInt16
{
return Convert::ToUInt16( GetDoubleValue() );
}
virtual UInt32 ToUInt32( IFormatProvider^ /*provider*/ ) = IConvertible::ToUInt32
{
return Convert::ToUInt32( GetDoubleValue() );
}
virtual UInt64 ToUInt64( IFormatProvider^ /*provider*/ ) = IConvertible::ToUInt64
{
return Convert::ToUInt64( GetDoubleValue() );
}
};
void WriteObjectInfo( Object^ testObject )
{
TypeCode typeCode = Type::GetTypeCode( testObject->GetType() );
switch ( typeCode )
{
case TypeCode::Boolean:
Console::WriteLine( "Boolean: {0}", testObject );
break;
case TypeCode::Double:
Console::WriteLine( "Double: {0}", testObject );
break;
default:
Console::WriteLine( "{0}: {1}", typeCode, testObject );
break;
}
}
int main()
{
Complex^ testComplex = gcnew Complex( 4,7 );
WriteObjectInfo( testComplex );
WriteObjectInfo( Convert::ToBoolean( testComplex ) );
WriteObjectInfo( Convert::ToDecimal( testComplex ) );
WriteObjectInfo( Convert::ToString( testComplex ) );
}
package ConsoleApplication2 ;
import System.*;
/// Class that implements IConvertible
class Complex implements IConvertible
{
private double x;
private double y;
public Complex(double x, double y)
{
this.x = x;
this.y = y;
} //Complex
public TypeCode GetTypeCode()
{
return TypeCode.Object;
} //GetTypeCode
public boolean ToBoolean(IFormatProvider provider)
{
if (x != 0.0 || y != 0.0) {
return true;
}
else {
return false;
}
} //ToBoolean
double GetDoubleValue()
{
return System.Math.Sqrt((x * x + y * y));
} //GetDoubleValue
public ubyte ToByte(IFormatProvider provider)
{
return Convert.ToByte(GetDoubleValue());
} //ToByte
public char ToChar(IFormatProvider provider)
{
return Convert.ToChar(GetDoubleValue());
} //ToChar
public DateTime ToDateTime(IFormatProvider provider)
{
return Convert.ToDateTime(GetDoubleValue());
} //ToDateTime
public System.Decimal ToDecimal(IFormatProvider provider)
{
return Convert.ToDecimal(GetDoubleValue());
} //ToDecimal
public double ToDouble(IFormatProvider provider)
{
return GetDoubleValue();
} //ToDouble
public short ToInt16(IFormatProvider provider)
{
return Convert.ToInt16(GetDoubleValue());
} //ToInt16
public int ToInt32(IFormatProvider provider)
{
return Convert.ToInt32(GetDoubleValue());
} //ToInt32
public long ToInt64(IFormatProvider provider)
{
return Convert.ToInt64(GetDoubleValue());
} //ToInt64
public byte ToSByte(IFormatProvider provider)
{
return Convert.ToSByte(GetDoubleValue());
} //ToSByte
public float ToSingle(IFormatProvider provider)
{
return Convert.ToSingle(GetDoubleValue());
} //ToSingle
public String ToString(IFormatProvider provider)
{
return "( " + System.Convert.ToString(x)
+ " , " + System.Convert.ToString(y)+ " )";
} //ToString
public Object ToType(Type conversionType, IFormatProvider provider)
{
return Convert.ChangeType(new Double(GetDoubleValue()),
conversionType);
} //ToType
public UInt16 ToUInt16(IFormatProvider provider)
{
return Convert.ToUInt16(GetDoubleValue());
} //ToUInt16
public UInt32 ToUInt32(IFormatProvider provider)
{
return Convert.ToUInt32(GetDoubleValue());
} //ToUInt32
public UInt64 ToUInt64(IFormatProvider provider)
{
return Convert.ToUInt64(GetDoubleValue());
} //ToUInt64
} //Complex
/// <summary>
/// Summary description for Class1.
/// </summary>
class Class1
{
public static void main(String[] args)
{
Complex testComplex = new Complex(4, 7);
WriteObjectInfo(testComplex);
WriteObjectInfo((System.Boolean)(Convert.ToBoolean(testComplex)));
WriteObjectInfo(Convert.ToDecimal(testComplex));
WriteObjectInfo(Convert.ToString(testComplex));
} //main
static void WriteObjectInfo(Object testObject)
{
TypeCode typeCode = Type.GetTypeCode(testObject.GetType());
switch (typeCode) {
case TypeCode.Boolean :
Console.WriteLine("Boolean: {0}", testObject);
break;
case TypeCode.Double :
Console.WriteLine("Double: {0}", testObject);
break;
default :
Console.WriteLine("{0}: {1}", typeCode.ToString(), testObject);
break;
}
} //WriteObjectInfo
} //Class1
플랫폼
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework에서 모든 플래폼의 모든 버전을 지원하지는 않습니다. 지원되는 버전의 목록은 시스템 요구 사항을 참조하십시오.
버전 정보
.NET Framework
2.0, 1.1, 1.0에서 지원
.NET Compact Framework
2.0, 1.0에서 지원