PowerTools SPREAD for Windows Forms 10.0J
ToDouble メソッド


変換する値
指定した値を倍精度浮動小数点数に変換します。
構文
'Declaration
 
Public Shared Function ToDouble( _
   ByVal value As Object _
) As Double
'使用法
 
Dim value As Object
Dim value As Double
 
value = CalcConvert.ToDouble(value)
public static double ToDouble( 
   object value
)

パラメータ

value
変換する値

戻り値の型

指定した値と等しい倍精度浮動小数点数
例外
例外説明
System.InvalidCastException値を変換できません。
次のサンプルコードは、値を倍精度浮動小数点数に変換します。
public class CubeFunctionInfo : FunctionInfo 
    {
        public override string Name { get { return "CUBE"; } }
        public override int MinArgs { get { return 1; } }
        public override int MaxArgs { get { return 1; } }
        public override object Evaluate (object[] args)
        {
            double num = CalcConvert.ToDouble(args[0]);
            return num * num * num;
        }
    }
Public Class CubeFunctionInfo
   Inherits FarPoint.CalcEngine.FunctionInfo

   Public Overrides ReadOnly Property Name() As String
   Get
   Return "CUBE"
   End Get
   End Property

   Public Overrides ReadOnly Property MinArgs() As Integer
   Get
   Return 1
   End Get
   End Property

   Public Overrides ReadOnly Property MaxArgs() As Integer
   Get
   Return 1
   End Get
   End Property

   Public Overrides Function Evaluate(ByVal args() As Object) As Object
   Dim num As Double = FarPoint.CalcEngine.CalcConvert.ToDouble(args(0))
   Return num * num * num
   End Function
End Class
参照

CalcConvert クラス
CalcConvert メンバ

 

 


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