CharacterRange-Struktur
Gibt einen Bereich von Zeichenpositionen in einer Zeichenfolge an.
Namespace: System.Drawing
Assembly: System.Drawing (in system.drawing.dll)
Syntax
'Declaration
Public Structure CharacterRange
'Usage
Dim instance As CharacterRange
public struct CharacterRange
public value class CharacterRange
public final class CharacterRange extends ValueType
JScript unterstützt die Verwendung von Strukturen, aber nicht die Deklaration von neuen Strukturen.
Beispiel
Im folgenden Codebeispiel wird veranschaulicht, wie Sie einen CharacterRange erstellen und zum Hervorheben eines Teiles einer Zeichenfolge verwenden. Dieses Beispiel ist für die Verwendung mit Windows Forms vorgesehen. Fügen Sie das Beispiel in ein Formular ein, und rufen Sie beim Behandeln des Paint-Ereignisses des Formulars die HighlightACharacterRange-Methode auf, wobei Sie e als PaintEventArgs übergeben.
Private Sub HighlightACharacterRange(ByVal e As PaintEventArgs)
' Declare the string to draw.
Dim message As String = _
"This is the string to highlight a word in."
' Declare the word to highlight.
Dim searchWord As String = "string"
' Create a CharacterRange array with the searchWord
' location and length.
Dim ranges() As CharacterRange = _
New CharacterRange() _
{New CharacterRange(message.IndexOf(searchWord), _
searchWord.Length)}
' Construct a StringFormat object.
Dim stringFormat1 As New StringFormat
' Set the ranges on the StringFormat object.
stringFormat1.SetMeasurableCharacterRanges(ranges)
' Declare the font to write the message in.
Dim largeFont As Font = New Font(FontFamily.GenericSansSerif, _
16.0F, GraphicsUnit.Pixel)
' Construct a new Rectangle.
Dim displayRectangle As New Rectangle(20, 20, 200, 100)
' Convert the Rectangle to a RectangleF.
Dim displayRectangleF As RectangleF = _
RectangleF.op_Implicit(displayRectangle)
' Get the Region to highlight by calling the
' MeasureCharacterRanges method.
Dim charRegion() As Region = _
e.Graphics.MeasureCharacterRanges(message, _
largeFont, displayRectangleF, stringFormat1)
' Draw the message string on the form.
e.Graphics.DrawString(message, largeFont, Brushes.Blue, _
displayRectangleF)
' Fill in the region using a semi-transparent color.
e.Graphics.FillRegion(New SolidBrush(Color.FromArgb(50, _
Color.Fuchsia)), charRegion(0))
End Sub
private void HighlightACharacterRange(PaintEventArgs e)
{
// Declare the string to draw.
string message = "This is the string to highlight a word in.";
// Declare the word to highlight.
string searchWord = "string";
// Create a CharacterRange array with the searchWord
// location and length.
CharacterRange[] ranges =
new CharacterRange[]{new CharacterRange
(message.IndexOf(searchWord), searchWord.Length)};
// Construct a StringFormat object.
StringFormat stringFormat1 = new StringFormat();
// Set the ranges on the StringFormat object.
stringFormat1.SetMeasurableCharacterRanges(ranges);
// Declare the font to write the message in.
Font largeFont = new Font(FontFamily.GenericSansSerif, 16.0F,
GraphicsUnit.Pixel);
// Construct a new Rectangle.
Rectangle displayRectangle = new Rectangle(20, 20, 200, 100);
// Convert the Rectangle to a RectangleF.
RectangleF displayRectangleF = (RectangleF)displayRectangle;
// Get the Region to highlight by calling the
// MeasureCharacterRanges method.
Region[] charRegion = e.Graphics.MeasureCharacterRanges(message,
largeFont, displayRectangleF, stringFormat1);
// Draw the message string on the form.
e.Graphics.DrawString(message, largeFont, Brushes.Blue,
displayRectangleF);
// Fill in the region using a semi-transparent color.
e.Graphics.FillRegion(new SolidBrush(Color.FromArgb(50, Color.Fuchsia)),
charRegion[0]);
largeFont.Dispose();
}
void HighlightACharacterRange( PaintEventArgs^ e )
{
// Declare the string to draw.
String^ message = "This is the string to highlight a word in.";
// Declare the word to highlight.
String^ searchWord = "string";
// Create a CharacterRange array with the searchWord
// location and length.
array<CharacterRange>^ temp = {CharacterRange( message->IndexOf( searchWord ), searchWord->Length )};
array<CharacterRange>^ranges = temp;
// Construct a StringFormat object.
StringFormat^ stringFormat1 = gcnew StringFormat;
// Set the ranges on the StringFormat object.
stringFormat1->SetMeasurableCharacterRanges( ranges );
// Declare the font to write the message in.
System::Drawing::Font^ largeFont = gcnew System::Drawing::Font( FontFamily::GenericSansSerif,16.0F,GraphicsUnit::Pixel );
// Construct a new Rectangle.
Rectangle displayRectangle = Rectangle(20,20,200,100);
// Convert the Rectangle to a RectangleF.
RectangleF displayRectangleF = displayRectangle;
// Get the Region to highlight by calling the
// MeasureCharacterRanges method.
array<System::Drawing::Region^>^charRegion = e->Graphics->MeasureCharacterRanges( message, largeFont, displayRectangleF, stringFormat1 );
// Draw the message string on the form.
e->Graphics->DrawString( message, largeFont, Brushes::Blue, displayRectangleF );
// Fill in the region using a semi-transparent color.
e->Graphics->FillRegion( gcnew SolidBrush( Color::FromArgb( 50, Color::Fuchsia ) ), charRegion[ 0 ] );
delete largeFont;
}
private void HighlightACharacterRange(PaintEventArgs e)
{
// Declare the string to draw.
String message = "This is the string to highlight a word in.";
// Declare the word to highlight.
String searchWord = "string";
// Create a CharacterRange array with the searchWord
// location and length.
CharacterRange ranges[] = new CharacterRange[]
{ new CharacterRange(message.IndexOf(searchWord),
searchWord.get_Length()) };
// Construct a StringFormat object.
StringFormat stringFormat1 = new StringFormat();
// Set the ranges on the StringFormat object.
stringFormat1.SetMeasurableCharacterRanges(ranges);
// Declare the font to write the message in.
Font largeFont = new Font(FontFamily.get_GenericSansSerif(),
16, GraphicsUnit.Pixel);
// Construct a new Rectangle.
Rectangle displayRectangle = new Rectangle(20, 20, 200, 100);
// Convert the Rectangle to a RectangleF.
RectangleF displayRectangleF = RectangleF.op_Implicit(displayRectangle);
// Get the Region to highlight by calling the
// MeasureCharacterRanges method.
Region charRegion[] = e.get_Graphics().MeasureCharacterRanges(message,
largeFont, displayRectangleF, stringFormat1);
// Draw the message string on the form.
e.get_Graphics().DrawString(message, largeFont, Brushes.get_Blue(),
displayRectangleF);
// Fill in the region using a semi-transparent color.
e.get_Graphics().FillRegion(new SolidBrush(Color.FromArgb(50,
Color.get_Fuchsia())), charRegion[0]);
largeFont.Dispose();
} //HighlightACharacterRange
Threadsicherheit
Alle öffentlichen statischen (Shared in Visual Basic) Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.
Plattformen
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0