internal void ApplyFilter(SingleFilterInfo filterParts)
{
List <T> results;
// Check to see if the property type we are filtering by implements
// the IComparable interface.
Type interfaceType =
TypeDescriptor.GetProperties(typeof(T))[filterParts.PropName]
.PropertyType.GetInterface("IComparable");
if (interfaceType == null)
{
throw new InvalidOperationException("Filtered property" +
" must implement IComparable.");
}
results = new List <T>();
// Check each value and add to the results list.
foreach (T item in this)
{
if (filterParts.PropDesc.GetValue(item) != null)
{
IComparable compareValue =
filterParts.PropDesc.GetValue(item) as IComparable;
int result =
compareValue.CompareTo(filterParts.CompareValue);
if (filterParts.OperatorValue ==
FilterOperator.EqualTo && result == 0)
{
results.Add(item);
}
if (filterParts.OperatorValue ==
FilterOperator.GreaterThan && result > 0)
{
results.Add(item);
}
if (filterParts.OperatorValue ==
FilterOperator.LessThan && result < 0)
{
results.Add(item);
}
}
}
this.ClearItems();
foreach (T itemFound in results)
{
this.Add(itemFound);
}
}
internal SingleFilterInfo ParseFilter(string filterPart)
{
SingleFilterInfo filterInfo = new SingleFilterInfo();
filterInfo.OperatorValue = DetermineFilterOperator(filterPart);
string[] filterStringParts =
filterPart.Split(new char[] { (char)filterInfo.OperatorValue });
filterInfo.PropName =
filterStringParts[0].Replace("[", "").
Replace("]", "").Replace(" AND ", "").Trim();
// Get the property descriptor for the filter property name.
PropertyDescriptor filterPropDesc =
TypeDescriptor.GetProperties(typeof(T))[filterInfo.PropName];
// Convert the filter compare value to the property type.
if (filterPropDesc == null)
{
throw new InvalidOperationException("Specified property to " +
"filter " + filterInfo.PropName +
" on does not exist on type: " + typeof(T).Name);
}
filterInfo.PropDesc = filterPropDesc;
string comparePartNoQuotes = StripOffQuotes(filterStringParts[1]);
try
{
TypeConverter converter =
TypeDescriptor.GetConverter(filterPropDesc.PropertyType);
filterInfo.CompareValue =
converter.ConvertFromString(comparePartNoQuotes);
}
catch (NotSupportedException)
{
throw new InvalidOperationException("Specified filter" +
"value " + comparePartNoQuotes + " can not be converted" +
"from string. Implement a type converter for " +
filterPropDesc.PropertyType.ToString());
}
return(filterInfo);
}
