Convert.ToChar Method (String, IFormatProvider)

public static char ToChar (
	string value,
	IFormatProvider provider
)

public static char ToChar (
	String value, 
	IFormatProvider provider
)

public static function ToChar (
	value : String, 
	provider : IFormatProvider
) : char

Not applicable.

// Example of selected Convert.ToXXX( String, IFormatProvider ) methods.
using System;
using System.Globalization;

public class DummyProvider : IFormatProvider
{
    // Normally, GetFormat returns an object of the requested type
    // (usually itself) if it is able; otherwise, it returns Nothing. 
    public object GetFormat(Type argType)
    {
        // Here, GetFormat displays the name of argType, after removing 
        // the namespace information. GetFormat always returns null.
        string argStr = argType.ToString( );
        if( argStr == "" ) 
            argStr = "Empty";
        argStr = argStr.Substring( argStr.LastIndexOf( '.' ) + 1 );

        Console.Write( "{0,-20}", argStr );
        return null;
    }
}

class ConvertNonNumericProviderDemo
{
    public static void Main( )
    {
        // Create an instance of IFormatProvider.
        DummyProvider provider = new DummyProvider( );
        string format   = "{0,-17}{1,-17}{2}";

        // Convert these values using DummyProvider.
        string Int32A   = "-252645135";
        string DoubleA  = "61680.3855";
        string DayTimeA = "2001/9/11 13:45";

        string BoolA    = "True";
        string StringA  = "Qwerty";
        string CharA    = "$";

        Console.WriteLine( "This example of selected " +
            "Convert.ToXXX( String, IFormatProvider ) \nmethods " +
            "generates the following output. The example displays " +
            "the \nprovider type if the IFormatProvider is called." );
        Console.WriteLine( "\nNote: For the " +
            "ToBoolean, ToString, and ToChar methods, the \n" +
            "IFormatProvider object is not referenced." );

        // The format provider is called for the following conversions.
        Console.WriteLine( );
        Console.WriteLine( format, "ToInt32", Int32A, 
            Convert.ToInt32( Int32A, provider ) );
        Console.WriteLine( format, "ToDouble", DoubleA, 
            Convert.ToDouble( DoubleA, provider ) );
        Console.WriteLine( format, "ToDateTime", DayTimeA, 
            Convert.ToDateTime( DayTimeA, provider ) );

        // The format provider is not called for these conversions.
        Console.WriteLine( );
        Console.WriteLine( format, "ToBoolean", BoolA, 
            Convert.ToBoolean( BoolA, provider ) );
        Console.WriteLine( format, "ToString", StringA, 
            Convert.ToString( StringA, provider ) );
        Console.WriteLine( format, "ToChar", CharA, 
            Convert.ToChar( CharA, provider ) );
    }
}

/*
This example of selected Convert.ToXXX( String, IFormatProvider )
methods generates the following output. The example displays the
provider type if the IFormatProvider is called.

Note: For the ToBoolean, ToString, and ToChar methods, the
IFormatProvider object is not referenced.

NumberFormatInfo    ToInt32          -252645135       -252645135
NumberFormatInfo    ToDouble         61680.3855       61680.3855
DateTimeFormatInfo  ToDateTime       2001/9/11 13:45  9/11/2001 1:45:00 PM

ToBoolean        True             True
ToString         Qwerty           Qwerty
ToChar           $                $
*/ 

// Example of selected Convert.ToXXX( String, IFormatProvider ) methods.
import System.* ;
import System.Globalization.* ;

public class DummyProvider implements IFormatProvider
{
    // Normally, GetFormat returns an object of the requested type
    // (usually itself) if it is able; otherwise, it returns Nothing. 
    public Object GetFormat(Type argType)
    {
        // Here, GetFormat displays the name of argType, after removing 
        // the namespace information. GetFormat always returns null.
        String argStr = argType.ToString();
        if ( argStr.Equals("")) {
            argStr = "Empty";
        }
        argStr = argStr.Substring((argStr.LastIndexOf('.') + 1));

        Console.Write("{0,-20}", argStr);
        return null ;
    } //GetFormat
} //DummyProvider


class ConvertNonNumericProviderDemo
{   
    public static void main(String[] args)
    {
        // Create an instance of IFormatProvider.
        DummyProvider provider =  new DummyProvider();
        String format = "{0,-17}{1,-17}{2}";

        // Convert these values using DummyProvider.
        String int32A = "-252645135";
        String doubleA = "61680.3855";
        String dayTimeA = "2001/9/11 13:45";

        String boolA = "True";
        String stringA = "Qwerty";
        String charA = "$";

        Console.WriteLine(("This example of selected "
            + "Convert.ToXXX( String, IFormatProvider ) \nmethods " 
            + "generates the following output. The example displays " 
            + "the \nprovider type if the IFormatProvider is called."));
        Console.WriteLine(("\nNote: For the " 
            + "ToBoolean, ToString, and ToChar methods, the \n" 
            + "IFormatProvider object is not referenced."));

        // The format provider is called for the following conversions.
        Console.WriteLine();
        Console.WriteLine(format, "ToInt32", int32A,
            System.Convert.ToString(Convert.ToInt32(int32A, provider)));
        Console.WriteLine(format, "ToDouble", doubleA,
            System.Convert.ToString(Convert.ToDouble(doubleA, provider)));
        Console.WriteLine(format, "ToDateTime", dayTimeA, 
            Convert.ToDateTime(dayTimeA, provider));

        // The format provider is not called for these conversions.
        Console.WriteLine();
        Console.WriteLine(format, "ToBoolean", 
        boolA,System.Convert.ToString(Convert.ToBoolean(boolA, provider)));
        Console.WriteLine(format, "ToString", 
        stringA, Convert.ToString(stringA, provider));
        Console.WriteLine(format, "ToChar", charA, 
        System.Convert.ToString(Convert.ToChar(charA, provider)));
    } //main
} //ConvertNonNumericProviderDemo

/*
This example of selected Convert.ToXXX( String, IFormatProvider )
methods generates the following output. The example displays the
provider type if the IFormatProvider is called.

Note: For the ToBoolean, ToString, and ToChar methods, the
IFormatProvider object is not referenced.

NumberFormatInfo    ToInt32          -252645135       -252645135
NumberFormatInfo    ToDouble         61680.3855       61680.3855
DateTimeFormatInfo  ToDateTime       2001/9/11 13:45  9/11/2001 1:45:00 PM

ToBoolean        True             True
ToString         Qwerty           Qwerty
ToChar           $                $
*/