static internal T GetRequiredSingleAttribute <T>(CustomAttributeProvider attrProvider, Type[] attrTypeGroup)
where T : class
{
T result = GetSingleAttribute <T>(attrProvider, attrTypeGroup);
if (result == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.Format(SR.couldnTFindRequiredAttributeOfTypeOn2, typeof(T), attrProvider.ToString())));
}
return(result);
}
static internal T GetSingleAttribute <T>(CustomAttributeProvider attrProvider)
where T : class
{
Type attrType = typeof(T);
object[] attrs = GetCustomAttributes(attrProvider, attrType);
if (attrs == null || attrs.Length == 0)
{
return(null);
}
else if (attrs.Length > 1)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.Format(SR.tooManyAttributesOfTypeOn2, attrType, attrProvider.ToString())));
}
else
{
return(attrs[0] as T);
}
}