Convert.ToChar Method (String, IFormatProvider)
Converts the first character of a specified string to a Unicode character, using specified culture-specific formatting information.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
-
Type:
System.String
A string of length 1 or null.
- provider
-
Type:
System.IFormatProvider
An object that supplies culture-specific formatting information. This parameter is ignored.
Return Value
Type: System.CharA Unicode character that is equivalent to the first and only character in value.
| Exception | Condition |
|---|---|
| ArgumentNullException | value is null. |
| FormatException | The length of value is not 1. |
value must be a string that contains a single character.
If you prefer not to handle an exception if the conversion fails, you can call the Char.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.
The following example converts a string representation of a Char value with the ToChar method, using an IFormatProvider object that displays the type of the format provider for which it is called. The example shows that the format provider is not referenced.
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.To<Type>( 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.To<Type>( 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 $ $ */
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1