public static int CalculateArgumentScore(Type paramType, Type argType)
{
if (null == argType)
{
return(!paramType.IsValueType ? ExactMatchScore : -1);
}
if (paramType == argType)
{
return(ExactMatchScore);
}
if (paramType.IsAssignableFrom(argType))
{
return(UpCastScore);
}
if (argType.IsAssignableFrom(paramType))
{
return(DowncastScore);
}
if (IsNumericPromotion(paramType, argType))
{
return(NumericTypes.IsWideningPromotion(paramType, argType) ? WideningPromotion : NarrowingPromotion);
}
var conversion = RuntimeServices.FindImplicitConversionOperator(argType, paramType);
if (null != conversion)
{
return(ImplicitConversionScore);
}
return(-1);
}
private int CalculateArgumentScore(Candidate candidate, int argumentIndex, ParameterInfo parameter, Type argType)
{
if (parameter.IsOut)
{
return(-1);
}
if (null == argType)
{
if (parameter.ParameterType.IsValueType)
{
return(-1);
}
return(ExactMatchScore);
}
else
{
Type paramType = parameter.ParameterType;
if (paramType == argType)
{
return(ExactMatchScore);
}
if (paramType.IsAssignableFrom(argType))
{
return(UpCastScore);
}
if (argType.IsAssignableFrom(paramType))
{
return(DowncastScore);
}
if (IsNumericPromotion(paramType, argType))
{
return(PromotionScore);
}
MethodInfo conversion = RuntimeServices.FindImplicitConversionOperator(argType, paramType);
if (null != conversion)
{
candidate.RememberArgumentConversion(argumentIndex, conversion);
return(ImplicitConversionScore);
}
}
return(-1);
}
public static int CalculateArgumentScore(Type paramType, Type argType)
{
if (null == argType)
{
if (paramType.IsValueType)
{
return(-1);
}
return(CandidateMethod.ExactMatchScore);
}
else
{
if (paramType == argType)
{
return(CandidateMethod.ExactMatchScore);
}
if (paramType.IsAssignableFrom(argType))
{
return(CandidateMethod.UpCastScore);
}
if (argType.IsAssignableFrom(paramType))
{
return(CandidateMethod.DowncastScore);
}
if (IsNumericPromotion(paramType, argType))
{
if (NumericTypes.IsWideningPromotion(paramType, argType))
{
return(WideningPromotion);
}
return(CandidateMethod.NarrowingPromotion);
}
MethodInfo conversion = RuntimeServices.FindImplicitConversionOperator(argType, paramType);
if (null != conversion)
{
return(CandidateMethod.ImplicitConversionScore);
}
}
return(-1);
}
protected void EmitCoercion(Type actualType, Type expectedType, int score)
{
switch (score)
{
case CandidateMethod.WideningPromotion:
case CandidateMethod.NarrowingPromotion:
EmitPromotion(expectedType, actualType);
break;
case CandidateMethod.ImplicitConversionScore:
EmitCastOrUnbox(actualType);
_il.Emit(OpCodes.Call, RuntimeServices.FindImplicitConversionOperator(actualType, expectedType));
break;
default:
EmitCastOrUnbox(expectedType);
break;
}
}