Color.ToArgb Color.ToArgb Color.ToArgb Color.ToArgb Method

定义

获取此 Color 结构的 32 位 ARGB 值。Gets the 32-bit ARGB value of this Color structure.

public:
 int ToArgb();
public int ToArgb ();
member this.ToArgb : unit -> int
Public Function ToArgb () As Integer

返回

Color 的 32 位 ARGB 值。The 32-bit ARGB value of this Color.

示例

下面的代码示例设计为使用 Windows 窗体,并且它需要PaintEventArgs e,这是一个参数的Paint事件处理程序。The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. 该代码执行下列操作:The code performs the following actions:

  • 循环访问KnownColor枚举元素以找到具有非零绿色分量和零值的红色部分,并不是系统颜色的所有已知的颜色。Iterates through the KnownColor enumeration elements to find all known colors that have a non-zero green component and a zero-value red component, and that are not system colors.

  • 每次迭代过程将保存KnownColor元素-如果它符合条件的数组中。During each iteration, saves the KnownColor element - if it matches the criteria - in an array.

  • 使用画笔绘制矩形。Uses a brush to paint rectangles.

每个矩形绘制KnownColor匹配在第一个项目符号中所述的条件。Each of the rectangles is painted a KnownColor that matches the criteria stated in the first bullet. 名称KnownColor并显示其组件值。The name of the KnownColor and its component values are also displayed.

此示例中显示某些已知的颜色、 颜色和其四个分量值的名称。This example displays certain known colors, the names of the colors, and their four component values. ToArgb方法使用作为预备步骤,以显示组件值。The ToArgb method is used as a preliminary step to display the component values.

void ToArgbToStringExample1( PaintEventArgs^ e )
{
   Graphics^ g = e->Graphics;

   // Color structure used for temporary storage.
   Color someColor = Color::FromArgb( 0 );

   // Array to store KnownColor values that match the criteria.
   array<KnownColor>^colorMatches = gcnew array<KnownColor>(167);

   // Number of matches found.
   int count = 0;

   // Iterate through the KnownColor enums to find all corresponding colors
   // that have a nonzero green component and zero-value red component and
   // that are not system colors.
   for ( KnownColor enumValue = (KnownColor)0; enumValue <= KnownColor::YellowGreen; enumValue = enumValue + (KnownColor)1 )
   {
      someColor = Color::FromKnownColor( enumValue );
      if ( someColor.G != 0 && someColor.R == 0 &&  !someColor.IsSystemColor )
               colorMatches[ count++ ] = enumValue;
   }
   SolidBrush^ myBrush1 = gcnew SolidBrush( someColor );
   System::Drawing::Font^ myFont = gcnew System::Drawing::Font( "Arial",9 );
   int x = 40;
   int y = 40;

   // Iterate through the matches that were found and display each color that
   // corresponds with the enum value in the array. also display the name of
   // the KnownColor and the ARGB components.
   for ( int i = 0; i < count; i++ )
   {
      // Display the color.
      someColor = Color::FromKnownColor( colorMatches[ i ] );
      myBrush1->Color = someColor;
      g->FillRectangle( myBrush1, x, y, 50, 30 );

      // Display KnownColor name and the four component values. To display the
      // component values:  Use the ToArgb method to get the 32-bit ARGB value
      // of someColor, which was created from a KnownColor. Then create a
      // Color structure from the 32-bit ARGB value and set someColor equal to
      // this new Color structure. Then use the ToString method to convert it to
      // a string.
      g->DrawString( someColor.ToString(), myFont, Brushes::Black, (float)x + 55, (float)y );
      someColor = Color::FromArgb( someColor.ToArgb() );
      g->DrawString( someColor.ToString(), myFont, Brushes::Black, (float)x + 55, (float)y + 15 );
      y += 40;
   }
}
public void ToArgbToStringExample1(PaintEventArgs e)
{
    Graphics     g = e.Graphics;
             
    // Color structure used for temporary storage.
    Color   someColor = Color.FromArgb(0);
             
    // Array to store KnownColor values that match the criteria.
    KnownColor[]  colorMatches = new KnownColor[167];
    
    // Number of matches found.
    int  count = 0; 

    // Iterate through the KnownColor enums to find all corresponding colors
    // that have a nonzero green component and zero-value red component and
    // that are not system colors.
    for (KnownColor enumValue = 0;
        enumValue <= KnownColor.YellowGreen; enumValue++)
    {
        someColor = Color.FromKnownColor(enumValue);
        if (someColor.G != 0 && someColor.R == 0 && !someColor.IsSystemColor)
            colorMatches[count++] = enumValue;
    }
    SolidBrush  myBrush1 = new SolidBrush(someColor);
    Font        myFont = new Font("Arial", 9);
    int         x = 40;
    int         y = 40;
             
    // Iterate through the matches that were found and display each color that
    // corresponds with the enum value in the array. also display the name of
    // the KnownColor and the ARGB components.
    for (int i = 0; i < count; i++)
    {
             
        // Display the color.
        someColor = Color.FromKnownColor(colorMatches[i]);
        myBrush1.Color = someColor;
        g.FillRectangle(myBrush1, x, y, 50, 30);
             
        // Display KnownColor name and the four component values. To display the
        // component values:  Use the ToArgb method to get the 32-bit ARGB value
        // of someColor, which was created from a KnownColor. Then create a
        // Color structure from the 32-bit ARGB value and set someColor equal to
        // this new Color structure. Then use the ToString method to convert it to
        // a string.
        g.DrawString(someColor.ToString(), myFont, Brushes.Black, x + 55, y);
        someColor = Color.FromArgb(someColor.ToArgb());
        g.DrawString(someColor.ToString(), myFont, Brushes.Black, x + 55, y + 15);
        y += 40;
    }
}
Public Sub ToArgbToStringExample1(ByVal e As PaintEventArgs)
    Dim g As Graphics = e.Graphics

    ' Color structure used for temporary storage.
    Dim someColor As Color = Color.FromArgb(0)

    ' Array to store KnownColor values that match the criteria.
    Dim colorMatches(167) As KnownColor

    ' Number of matches found.
    Dim count As Integer = 0

    ' Iterate through KnownColor enums to find all corresponding colors
    ' that have a non-zero green component and zero-valued red
    ' component and that are not system colors.
    Dim enumValue As KnownColor
    For enumValue = 0 To KnownColor.YellowGreen
        someColor = Color.FromKnownColor(enumValue)
        If someColor.G <> 0 And someColor.R = 0 And _
        Not someColor.IsSystemColor Then
            colorMatches(count) = enumValue
            count += 1
        End If
    Next enumValue
    Dim myBrush1 As New SolidBrush(someColor)
    Dim myFont As New Font("Arial", 9)
    Dim x As Integer = 40
    Dim y As Integer = 40

    ' Iterate through the matches found and display each color that
    ' corresponds with the enum value in the array. Also display the
    ' name of the KnownColor and the ARGB components.
    Dim i As Integer
    For i = 0 To count - 1

        ' Display the color.
        someColor = Color.FromKnownColor(colorMatches(i))
        myBrush1.Color = someColor
        g.FillRectangle(myBrush1, x, y, 50, 30)

        ' Display KnownColor name and four component values. To display
        ' component values:  Use the ToArgb method to get the 32-bit
        ' ARGB value of someColor (created from a KnownColor). Create
        ' a Color structure from the 32-bit ARGB value and set someColor
        ' equal to this new Color structure. Then use the ToString method
        ' to convert it to a string.
        g.DrawString(someColor.ToString(), myFont, Brushes.Black, _
        x + 55, y)
        someColor = Color.FromArgb(someColor.ToArgb())
        g.DrawString(someColor.ToString(), myFont, Brushes.Black, _
        x + 55, y + 15)
        y += 40
    Next i
End Sub

注解

字节顺序的 32 位 ARGB 值为 AARRGGBB。The byte-ordering of the 32-bit ARGB value is AARRGGBB. AA,由表示最高有效字节 (MSB) 的 alpha 分量值。The most significant byte (MSB), represented by AA, is the alpha component value. 第二个、 第三和第四个字节,分别表示 RR、 GG 和 BB,分别为颜色组件红色、 绿色和蓝色,The second, third, and fourth bytes, represented by RR, GG, and BB, respectively, are the color components red, green, and blue, respectively

适用于