public static bool HasOperator(FilterOperatorField allOperators, FilterOperatorField singleOperator)
{
return((allOperators & singleOperator) == singleOperator);
}
/// <summary>
/// Compares two generic property values according to the filter operator field.
/// Is used to search business entity collections by reflection
/// </summary>
/// <typeparam name="T">Type of property (must implement IComparable)</typeparam>
/// <param name="filterValue">Filtering value</param>
/// <param name="propertyValue">Value of a property (of a given business entity)</param>
/// <param name="filterOperator">Filter criterion</param>
/// <returns></returns>
public static bool PropertyValuesMatch <T>(T filterValue, T propertyValue, FilterOperatorField filterOperator) where T : IComparable
{
bool result = false;
// If either arg is null then the only available options will be equal or not equal
if (propertyValue == null || filterValue == null)
{
switch (filterOperator)
{
case FilterOperatorField.NotEqual:
result = (propertyValue == null && filterValue != null) || (propertyValue != null && filterValue == null);
break;
case FilterOperatorField.Equal:
result = propertyValue == null && filterValue == null;
break;
}
return(result);
}
// Normal, non-null arguments
switch (filterOperator)
{
case FilterOperatorField.NotEqual:
if (typeof(T).IsAssignableFrom(typeof(string)))
{
string filterString = filterValue as string;
string propertyString = propertyValue as string;
result = propertyString.ToLower() != filterString.ToLower();
}
else
{
result = !propertyValue.Equals(filterValue);
}
break;
case FilterOperatorField.Equal:
if (typeof(T).IsAssignableFrom(typeof(string)))
{
string filterString = filterValue as string;
string propertyString = propertyValue as string;
result = propertyString.ToLower() == filterString.ToLower();
}
else
{
result = propertyValue.Equals(filterValue);
}
break;
case FilterOperatorField.GreaterThan:
result = propertyValue.CompareTo(filterValue) < 0;
break;
case FilterOperatorField.GreaterThanOrEqual:
result = propertyValue.CompareTo(filterValue) <= 0;
break;
case FilterOperatorField.LessThan:
result = propertyValue.CompareTo(filterValue) > 0;
break;
case FilterOperatorField.LessThanOrEqual:
result = propertyValue.CompareTo(filterValue) > 0;
break;
case FilterOperatorField.Contains:
if (typeof(T).IsAssignableFrom(typeof(string)))
{
string filterString = filterValue as string;
string propertyString = propertyValue as string;
result = propertyString.ToLower().Contains(filterString.ToLower());
}
break;
case FilterOperatorField.StartsWith:
if (typeof(T).IsAssignableFrom(typeof(string)))
{
string filterString = filterValue as string;
string propertyString = propertyValue as string;
result = propertyString.ToLower().StartsWith(filterString.ToLower());
}
break;
}
return(result);
}