/// <summary>
/// Sets up cached PropertyInfo and determines the best delegate to use to compare values
/// retrieved from that property.
/// </summary>
public void Initialize()
{
if (fFoundProperty == false)
{
fFoundProperty = true;
if (pi == null)
{
PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(T));
property = props[sPropertyName];
pi = typeof(T).GetProperty(sPropertyName);
if (pi == null)
{
throw new Exception("Property name " + sPropertyName +
" not found while trying to compare objects of type " + typeof(T).Name);
}
}
typ = pi.PropertyType;
// Set up the property comparison delegate to use based on the type of values we will be comparing
if (sortType == SortType.eUsePropertyOrFieldType)
{
sortType = Sorting.GetSortTypeEnumForType(typ);
if (typ == typeof(string))
{
if (stringComparisonToUse == StringComparison.Ordinal)
{
DoCompare = StringCompareOrdinal;
}
else
{
DoCompare = StringCompare;
}
}
else if (typ == typeof(int) && !fSortDescending)
{
DoCompare = CompareInt;
}
else if (typ == typeof(int))
{
DoCompare = CompareIntDesc;
}
else if (typ == typeof(DateTime))
{
DoCompare = CompareDates;
}
else if (typ == typeof(long))
{
DoCompare = CompareTypeSensitive <long>;
}
else if (typ == typeof(double))
{
DoCompare = CompareTypeSensitive <double>;
}
else if (typ == typeof(float))
{
DoCompare = CompareTypeSensitive <float>;
}
else if (typ == typeof(short))
{
DoCompare = CompareTypeSensitive <short>;
}
else if (typ == typeof(byte))
{
DoCompare = CompareTypeSensitive <byte>;
}
else if (typ == typeof(bool))
{
DoCompare = CompareTypeSensitive <bool>;
}
else if (typ.BaseType == typeof(Enum))
{
FastEnumLookup = new Dictionary <int, string>(32);
if (fSortDescending)
{
DoCompare = FastCompareEnumsDesc;
}
else
{
DoCompare = FastCompareEnumsAsc;
}
}
else
{
DoCompare = CompareUsingToString;
}
}
else
{
if (sortType == SortType.eString)
{
DoCompare = CompareUsingToString;
}
else if (sortType == SortType.eByte)
{
DoCompare = CompareUsingToByte;
}
else if (sortType == SortType.eDateTime)
{
DoCompare = CompareUsingToDate;
}
else if (sortType == SortType.eInteger)
{
DoCompare = CompareUsingToInt;
}
else if (sortType == SortType.eLong)
{
DoCompare = CompareUsingToInt64;
}
else if (sortType == SortType.eDoubleOrFloat)
{
DoCompare = CompareUsingToDouble;
}
else
{
DoCompare = CompareUsingToString;
}
}
}
}
/// <summary>
/// Sets up cached FieldInfo and determines the best delegate to use to compare values
/// retrieved from that field.
/// </summary>
public void Initialize()
{
if (fFoundField == false)
{
fFoundField = true;
if (fi == null)
{
// You can play around with binding flags if you really want to access nonpublic fields, etc...
// note that there is a significant performance hit on accessing protected and private fields,
// since security / permissions are checked every time, from what I can tell. It's better
// just to go through public properties if you're not accessing public fields.
// fi = typeof(T).GetField(sFieldName, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
fi = typeof(T).GetField(sFieldName);
if (fi == null)
{
throw new Exception("Field name " + sFieldName +
" not found while trying to compare objects of type " + typeof(T).Name);
}
}
typ = fi.FieldType;
if (sortType == SortType.eUsePropertyOrFieldType)
{
sortType = Sorting.GetSortTypeEnumForType(typ);
if (typ == typeof(string))
{
if (stringComparisonToUse == StringComparison.Ordinal)
{
DoCompare = StringCompareOrdinal;
}
else
{
DoCompare = StringCompare;
}
}
else if (typ == typeof(int) && !fSortDescending)
{
DoCompare = CompareInt;
}
else if (typ == typeof(int))
{
DoCompare = CompareIntDesc;
}
else if (typ == typeof(DateTime))
{
DoCompare = CompareDates;
}
else if (typ == typeof(long))
{
DoCompare = CompareTypeSensitive <long>;
}
else if (typ == typeof(double))
{
DoCompare = CompareTypeSensitive <double>;
}
else if (typ == typeof(float))
{
DoCompare = CompareTypeSensitive <float>;
}
else if (typ == typeof(short))
{
DoCompare = CompareTypeSensitive <short>;
}
else if (typ == typeof(byte))
{
DoCompare = CompareTypeSensitive <byte>;
}
else if (typ == typeof(bool))
{
DoCompare = CompareTypeSensitive <bool>;
}
else if (typ.BaseType == typeof(Enum))
{
FastEnumLookup = new Dictionary <int, string>(32);
if (fSortDescending)
{
DoCompare = FastCompareEnumsDesc;
}
else
{
DoCompare = FastCompareEnumsAsc;
}
}
else
{
DoCompare = CompareUsingToString;
}
// optimize to use the ABOVE path if the property or field type matches
// the requested sort type (i.e. below)
}
else
{
if (sortType == SortType.eString)
{
DoCompare = CompareUsingToString;
}
else if (sortType == SortType.eByte)
{
DoCompare = CompareUsingToByte;
}
else if (sortType == SortType.eDateTime)
{
DoCompare = CompareUsingToDate;
}
else if (sortType == SortType.eInteger)
{
DoCompare = CompareUsingToInt;
}
else if (sortType == SortType.eLong)
{
DoCompare = CompareUsingToInt64;
}
else if (sortType == SortType.eDoubleOrFloat)
{
DoCompare = CompareUsingToDouble;
}
else
{
DoCompare = CompareUsingToString;
}
}
}
}