Color.Transparent プロパティ

.NET Framework クラス ライブラリ リファレンス

Color.Transparent プロパティ

システム定義色を取得します。

名前空間: System.Drawing
アセンブリ: System.Drawing (system.drawing.dll 内)
構文

Visual Basic (宣言)

Public Shared ReadOnly Property
 Transparent As Color

Visual Basic (使用法)

Dim value As Color

value = Color.Transparent

C#

public static Color Transparent { get;
 }

C++

public:
static property Color Transparent {
    Color get ();
}

J#

/** @property */
public static Color get_Transparent ()

JScript

public static function get
 Transparent () : Color

プロパティ値
システム定義色を表す Color。

使用例

Transparent プロパティを使用する方法を次のコード例に示します。この例は、Windows フォームでの使用を意図してデザインされています。Button1 と Button2 という名前の 2 つのボタンが配置されているフォームにコードを貼り付けます。フォームのコンストラクタで UseTransparentProperty メソッドを呼び出します。

Visual Basic

Private Sub UseTransparentProperty()

    ' Set up the PictureBox to display the entire image, and
    ' to cover the entire client area.
    PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
    PictureBox1.Dock = DockStyle.Fill

    Try
        ' Set the Image property of the PictureBox to an image retrieved
        ' from the file system.
        PictureBox1.Image = _
            Image.FromFile("C:\Documents and Settings\All Users\"
 _
            & "Documents\My Pictures\Sample Pictures\sunset.jpg")

        ' Set the Parent property of Button1 and Button2 to the 
        ' PictureBox.
        Button1.Parent = PictureBox1
        Button2.Parent = PictureBox1

        ' Set the Color property of both buttons to transparent. 
        ' With this setting, the buttons assume the color of their
        ' parent.
        Button1.BackColor = Color.Transparent
        Button2.BackColor = Color.Transparent

    Catch ex As System.IO.FileNotFoundException
        MessageBox.Show("There was an error." _
        & "Make sure the image file path is valid.")
    End Try


End Sub

C#

private void UseTransparentProperty()
{

    // Set up the PictureBox to display the entire image, and
    // to cover the entire client area.
    PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
    PictureBox1.Dock = DockStyle.Fill;

    try
    {
        // Set the Image property of the PictureBox to an image retrieved
        // from the file system.
        PictureBox1.Image = 
            Image.FromFile("C:\\Documents and Settings\\All Users\\" +
            "Documents\\My Pictures\\Sample Pictures\\sunset.jpg");

        // Set the Parent property of Button1 and Button2 to the 
        // PictureBox.
        Button1.Parent = PictureBox1;
        Button2.Parent = PictureBox1;

        // Set the Color property of both buttons to transparent. 
        // With this setting the buttons assume the color of their
        // parent.
        Button1.BackColor = Color.Transparent;
        Button2.BackColor = Color.Transparent;

    }
    catch(System.IO.FileNotFoundException)
    {
        MessageBox.Show("There was an error." +
            "Make sure the image file path is valid.");
    }


}

C++

private:
   void UseTransparentProperty()
   {
      // Set up the PictureBox to display the entire image, and
      // to cover the entire client area.
      PictureBox1->SizeMode = PictureBoxSizeMode::StretchImage;
      PictureBox1->Dock = DockStyle::Fill;
      try
      {
         // Set the Image property of the PictureBox to an image retrieved
         // from the file system.
         PictureBox1->Image = Image::FromFile( "C:\\Documents and Settings\\All
 Users\\"
         "Documents\\My Pictures\\Sample Pictures\\sunset.jpg" );

         // Set the Parent property of Button1 and Button2 to the 
         // PictureBox.
         Button1->Parent = PictureBox1;
         Button2->Parent = PictureBox1;

         // Set the Color property of both buttons to transparent. 
         // With this setting the buttons assume the color of their
         // parent.
         Button1->BackColor = Color::Transparent;
         Button2->BackColor = Color::Transparent;
      }
      catch ( System::IO::FileNotFoundException^ ) 
      {
         MessageBox::Show( "There was an error."
         "Make sure the image file path is valid." );
      }
   }

J#

private void UseTransparentProperty()
{
    // Set up the PictureBox to display the entire image, and
    // to cover the entire client area.
    pictureBox1.set_SizeMode(PictureBoxSizeMode.StretchImage);
    pictureBox1.set_Dock(DockStyle.Fill);
    try {
        // Set the Image property of the PictureBox to an image retrieved
        // from the file system.
        pictureBox1.set_Image(Image.FromFile((
            "C:\\Documents and Settings\\All Users\\" 
            + "Documents\\My Pictures\\Sample Pictures\\sunset.jpg")));

        // Set the Parent property of button1 and button2 to the 
        // PictureBox.
        button1.set_Parent(pictureBox1);
        button2.set_Parent(pictureBox1);

        // Set the Color property of both buttons to transparent. 
        // With this setting the buttons assume the color of their
        // parent.
        button1.set_BackColor(Color.get_Transparent());
        button2.set_BackColor(Color.get_Transparent());
    }
    catch (System.IO.FileNotFoundException exp) {
        MessageBox.Show(("There was an error." 
            + "Make sure the image file path is valid."));
    }
} //UseTransparentProperty

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
Color 構造体
Color メンバ
System.Drawing 名前空間