/// <summary>
/// Creates or throws a converter.
/// </summary>
internal static IValueConverter <TValue> CreateOrThrow <TValue>()
{
var created =
StringConverter <TValue> .TryCreate(out var converter) ||
ParseConverter <TValue> .TryCreate(out converter) ||
EnumConverter <TValue> .TryCreate(out converter) ||
NullableTypeParseConverter <TValue> .TryCreate(out converter) ||
NullableEnumConverter <TValue> .TryCreate(out converter) ||
ConstructorConverter <TValue> .TryCreate(out converter) ||
CastConverter <TValue> .TryCreate(out converter);
if (created)
{
return(converter !);
}
throw ConfigurationExceptions.NoDefaultConverter <TValue>();
}
/// <summary>
/// Attempts to create an instance.
/// </summary>
internal static bool TryCreate(out IValueConverter <TValue>?converter)
{
converter = null;
var conversionOperatorInfo =
typeof(TValue).GetMethod(Common.OpExplicitMethodName, new[] { typeof(string) }) ??
typeof(TValue).GetMethod(Common.OpImplicitMethodName, new[] { typeof(string) });
if (conversionOperatorInfo == null)
{
return(false);
}
var strParamExpr = Expression.Parameter(typeof(string));
var callOperatorExpr = Expression.Call(conversionOperatorInfo, strParamExpr);
var lambdaExpr = Expression.Lambda <Func <string, TValue> >(callOperatorExpr, strParamExpr);
var function = lambdaExpr.Compile();
converter = new CastConverter <TValue>(function);
return(true);
}