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using System;
namespace Pfz.ConversionManagement.Converters
{
/// <summary>
/// Converter class for nullable types that checks for null or calls
/// the original value-type converter.
/// </summary>
public sealed class StringToNullableConverter<T> :
ConverterBase<string, T?>
where
T : struct
{
private readonly IConverter<string, T> _valueTypeConverter;
/// <summary>
/// Creates a new string to nullable converter based on the given valueTypeConverter.
/// </summary>
public StringToNullableConverter(IConverter<string, T> valueTypeConverter)
{
if (valueTypeConverter == null)
throw new ArgumentNullException("valueTypeConverter");
_valueTypeConverter = valueTypeConverter;
}
/// <summary>
/// Returns the valueTypeConverter.CanFail.
/// </summary>
public override bool CanFail
{
get
{
return _valueTypeConverter.CanFail;
}
}
/// <summary>
/// Does the conversion, returning null or calling the valueTypeConverter.
/// </summary>
public override T? Convert(string input)
{
if (string.IsNullOrWhiteSpace(input))
return null;
return _valueTypeConverter.Convert(input);
}
/// <summary>
/// Does the conversion, returning null or calling the valueTypeConverter.
/// </summary>
public override bool TryConvert(string input, out T? output)
{
if (string.IsNullOrWhiteSpace(input))
{
output = null;
return true;
}
T valueTypeOutput;
var result = _valueTypeConverter.TryConvert(input, out valueTypeOutput);
if (result)
{
output = valueTypeOutput;
return true;
}
output = null;
return false;
}
}
}
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I started to program computers when I was 11 years old, as a hobbyist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do their work easier, faster and with less errors.
Want more info or simply want to contact me?
Take a look at:
http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
Codeproject MVP 2012, 2015 & 2016
Microsoft MVP 2013-2014 (in October 2014 I started working at Microsoft, so I can't be a Microsoft MVP anymore).