語言

Color.B 屬性

定義

命名空間:
System.Drawing
組件:
netstandard.dll, System.Drawing.Primitives.dll
組件:
System.Drawing.Primitives.dll
組件:
System.Drawing.dll
組件:
netstandard.dll
來源:
Color.cs
來源:
Color.cs
來源:
Color.cs
來源:
Color.cs
來源:
Color.cs

取得此 Color 結構的藍色分量值。

public:
 property System::Byte B { System::Byte get(); };
public byte B { get; }
member this.B : byte
Public ReadOnly Property B As Byte

屬性值

Byte

藍色 Color分量值為 。

範例

以下程式碼範例展示了 ARGB、 Color 、 及 與 成員的性質。Implicit

此範例設計用於 Windows 表單。 將程式碼貼入表單，並從表單的ShowPropertiesOfSlateBlue事件處理方法呼叫該Paint方法，傳遞e為 PaintEventArgs。

void ShowPropertiesOfSlateBlue( PaintEventArgs^ e )
{
   Color slateBlue = Color::FromName( "SlateBlue" );
   Byte g = slateBlue.G;
   Byte b = slateBlue.B;
   Byte r = slateBlue.R;
   Byte a = slateBlue.A;
   array<Object^>^temp0 = {a,r,g,b};
   String^ text = String::Format( "Slate Blue has these ARGB values: Alpha:{0}, "
   "red:{1}, green: {2}, blue {3}", temp0 );
   e->Graphics->DrawString( text, gcnew System::Drawing::Font( this->Font,FontStyle::Italic ), gcnew SolidBrush( slateBlue ), RectangleF(PointF(0.0F,0.0F),this->Size) );
}

private void ShowPropertiesOfSlateBlue(PaintEventArgs e)
{
    Color slateBlue = Color.FromName("SlateBlue");
    byte g = slateBlue.G;
    byte b = slateBlue.B;
    byte r = slateBlue.R;
    byte a = slateBlue.A;
    string text = String.Format("Slate Blue has these ARGB values: Alpha:{0}, " +
        "red:{1}, green: {2}, blue {3}", new object[]{a, r, g, b});
    e.Graphics.DrawString(text, 
        new Font(this.Font, FontStyle.Italic), 
        new SolidBrush(slateBlue), 
        new RectangleF(new PointF(0.0F, 0.0F), this.Size));
}

Private Sub ShowPropertiesOfSlateBlue(ByVal e As PaintEventArgs)
    Dim slateBlue As Color = Color.FromName("SlateBlue")
    Dim g As Byte = slateBlue.G
    Dim b As Byte = slateBlue.B
    Dim r As Byte = slateBlue.R
    Dim a As Byte = slateBlue.A
    Dim text As String = _
    String.Format("Slate Blue has these ARGB values: Alpha:{0}, " _
       & "red:{1}, green: {2}, blue {3}", New Object() {a, r, g, b})
    e.Graphics.DrawString(text, New Font(Me.Font, FontStyle.Italic), _
        New SolidBrush(slateBlue), _
        New RectangleF(New PointF(0.0F, 0.0F), _
        Size.op_Implicit(Me.Size)))
End Sub

備註

每個像素的顏色以 32 位元數字表示：alpha、紅、綠、藍（ARGB）各 8 位元。 四個成分中的每個都是從0到255的數字，0代表無強度，255代表全強度。 同樣地， B 是從0到255的值，0代表沒有藍色，255代表完全藍色。

適用於