Color.ToString 方法

定义

命名空间:

System.Drawing

程序集:

System.Drawing.Primitives.dll

Source:

Color.cs

将此 Color 结构转换为可读字符串。

public:
 override System::String ^ ToString();

public override string ToString ();

override this.ToString : unit -> string

Public Overrides Function ToString () As String

返回

String

如果通过使用 FromName(String) 方法或 FromKnownColor(KnownColor) 方法，从预定义颜色创建 Color，则为此 Color的名称的字符串;否则，由 ARGB 组件名称及其值组成的字符串。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。 该代码执行以下操作：

• 循环访问 KnownColor 枚举元素，查找具有非零绿色分量和零值红色组件且不是系统颜色的所有已知颜色。

• 每次迭代期间，将 KnownColor 元素（如果它与条件匹配）保存在数组中。

• 使用画笔绘制矩形。 每个矩形都绘制 KnownColor，该 KnownColor 与第一步中所述的条件匹配。 还会显示 KnownColor 及其组件值的名称。

本示例显示某些已知颜色，并使用 ToString 显示颜色的名称及其四个组件值。

void ToArgbToStringExample2( 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 ToArgbToStringExample2(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 ToArgbToStringExample2(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

预定义的颜色也称为已知颜色，由 KnownColor 枚举的元素表示。 当 ToString 方法应用于使用 FromArgb 方法创建的 Color 结构时，ToString 返回一个由 ARGB 组件名称及其值组成的字符串，即使 ARGB 值与预定义颜色的 ARGB 值匹配也是如此。