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Color.FromName(String) 方法

定義

從指定的預先定義色彩名稱建立 Color 結構。

public:
 static System::Drawing::Color FromName(System::String ^ name);
public static System.Drawing.Color FromName (string name);
static member FromName : string -> System.Drawing.Color
Public Shared Function FromName (name As String) As Color

參數

name
String

字串,其為預先定義色彩的名稱。 有效名稱和 KnownColor 列舉型別元素的名稱相同。

傳回

這個方法建立的 Color

範例

下列程式代碼範例示範ARGBFromNameImplicit 成員Color的成員。

此範例的設計目的是要與 Windows Form 搭配使用。 將程式代碼貼到表單中,並從表單的事件Paint處理方法呼叫 ShowPropertiesOfSlateBlue 方法,並傳遞ePaintEventArgs

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

預先定義的色彩也稱為已知色彩,並以 列舉的 KnownColor 元素表示。 name如果參數不是預先定義色彩的有效名稱,FromName此方法會建立一個Color結構,其ARGB值為0 (,也就是所有ARGB元件都是0) 。

適用於