private static ExportCardinalityCheckResult MatchCardinality(EnumerableCardinality actualCardinality, ImportCardinality importCardinality)
{
switch (actualCardinality)
{
case EnumerableCardinality.Zero:
if (importCardinality == ImportCardinality.ExactlyOne)
{
return(ExportCardinalityCheckResult.NoExports);
}
break;
case EnumerableCardinality.TwoOrMore:
if (importCardinality.IsAtMostOne())
{
return(ExportCardinalityCheckResult.TooManyExports);
}
break;
default:
Assumes.IsTrue(actualCardinality == EnumerableCardinality.One);
break;
}
return(ExportCardinalityCheckResult.Match);
}
private static ExportCardinalityCheckResult MatchCardinality(EnumerableCardinality actualCardinality, ImportCardinality importCardinality)
{
switch (actualCardinality)
{
case EnumerableCardinality.Zero:
if (importCardinality == ImportCardinality.ExactlyOne)
{
return(ExportCardinalityCheckResult.NoExports);
}
break;
case EnumerableCardinality.TwoOrMore:
if (importCardinality.IsAtMostOne())
{
return(ExportCardinalityCheckResult.TooManyExports);
}
break;
default:
if (actualCardinality != EnumerableCardinality.One)
{
throw new Exception(SR.Diagnostic_InternalExceptionMessage);
}
break;
}
return(ExportCardinalityCheckResult.Match);
}
private T GetExportedValueCore <T>(string contractName, ImportCardinality cardinality)
{
Assumes.IsTrue(cardinality.IsAtMostOne());
Export export = GetExportsCore(typeof(T), (Type)null, contractName, cardinality).SingleOrDefault();
return((export != null) ? ExportServices.GetCastedExportedValue <T>(export) : default(T));
}
private T?GetExportedValueCore <T>(string?contractName, ImportCardinality cardinality)
{
if (!cardinality.IsAtMostOne())
{
throw new Exception(SR.Diagnostic_InternalExceptionMessage);
}
Export?export = GetExportsCore(typeof(T), (Type?)null, contractName, cardinality).SingleOrDefault();
return((export != null) ? ExportServices.GetCastedExportedValue <T>(export) : default);
