Converter<TInput, TOutput> Delegate
Represents a method that converts an object from one type to another type.
Assembly: mscorlib (in mscorlib.dll)
This delegate is used by the ConvertAll<TInput, TOutput> method of the Array class and the ConvertAll<TOutput> method of the List<T> class to convert each element of the collection from one type to another.
This section contains two code examples. The first demonstrates the Converter<TInput, TOutput> delegate with the ConvertAll<TInput, TOutput> method of the Array class, and the second demonstrates the delegate with the ConvertAll<TOutput> method of the List<T> generic class.
Example 1
The following code example defines a method named PointFToPoint that converts a PointF structure to a Point structure. The example then creates an array of PointF structures, creates a Converter<PointF, Point> delegate (Converter(Of PointF, Point) in Visual Basic) to represent the PointFToPoint method, and passes the delegate to the ConvertAll<TInput, TOutput> method. The ConvertAll<TInput, TOutput> method passes each element of the input list to the PointFToPoint method and puts the converted elements into a new list of Point structures. Both lists are displayed.
using System; using System.Drawing; using System.Collections.Generic; public class Example { public static void Main() { PointF[] apf = { new PointF(27.8F, 32.62F), new PointF(99.3F, 147.273F), new PointF(7.5F, 1412.2F) }; Console.WriteLine(); foreach( PointF p in apf ) { Console.WriteLine(p); } Point[] ap = Array.ConvertAll(apf, new Converter<PointF, Point>(PointFToPoint)); Console.WriteLine(); foreach( Point p in ap ) { Console.WriteLine(p); } } public static Point PointFToPoint(PointF pf) { return new Point(((int) pf.X), ((int) pf.Y)); } } /* This code example produces the following output: {X=27.8, Y=32.62} {X=99.3, Y=147.273} {X=7.5, Y=1412.2} {X=27,Y=32} {X=99,Y=147} {X=7,Y=1412} */
Example 2
The following code example defines a method named PointFToPoint that converts a PointF structure to a Point structure. The example then creates a List<T> of PointF structures, creates a Converter<PointF, Point> delegate (Converter(Of PointF, Point) in Visual Basic) to represent the PointFToPoint method, and passes the delegate to the ConvertAll<TOutput> method. The ConvertAll<TOutput> method passes each element of the input list to the PointFToPoint method and puts the converted elements into a new list of Point structures. Both lists are displayed.
using System; using System.Drawing; using System.Collections.Generic; public class Example { public static void Main() { List<PointF> lpf = new List<PointF>(); lpf.Add(new PointF(27.8F, 32.62F)); lpf.Add(new PointF(99.3F, 147.273F)); lpf.Add(new PointF(7.5F, 1412.2F)); Console.WriteLine(); foreach( PointF p in lpf ) { Console.WriteLine(p); } List<Point> lp = lpf.ConvertAll( new Converter<PointF, Point>(PointFToPoint)); Console.WriteLine(); foreach( Point p in lp ) { Console.WriteLine(p); } } public static Point PointFToPoint(PointF pf) { return new Point(((int) pf.X), ((int) pf.Y)); } } /* This code example produces the following output: {X=27.8, Y=32.62} {X=99.3, Y=147.273} {X=7.5, Y=1412.2} {X=27,Y=32} {X=99,Y=147} {X=7,Y=1412} */
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The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.