/// <summary>
/// Build a 'contains' expression for a searching a property that
/// contains the value of another string property
/// </summary>
public static Expression Build <T>(Expression <Func <T, string> > propertyToSearch, Expression <Func <T, string> > propertyToSearchFor)
{
var isNotNullExpression = ExpressionHelper.BuildNotNullExpression(propertyToSearch);
var searchForIsNotNullExpression = ExpressionHelper.BuildNotNullExpression(propertyToSearchFor);
var containsExpression = Expression.Call(propertyToSearch.Body, ExpressionMethods.StringContainsMethod, propertyToSearchFor.Body);
var fullNotNullExpression = Expression.AndAlso(isNotNullExpression, searchForIsNotNullExpression);
return(Expression.AndAlso(fullNotNullExpression, containsExpression));
}
/// <summary>
/// Build an 'EndsWith' expression for a string property against a property
/// </summary>
private static Expression Build <T>(Expression <Func <T, string> > stringProperty, Expression <Func <T, string> > propertyToSearchFor, SearchOptions searchOptions)
{
var endsWithExpresion = Expression.Call(stringProperty.Body, ExpressionMethods.EndsWithMethodWithComparison, propertyToSearchFor.Body, searchOptions.ComparisonTypeExpression);
Expression finalExpression = null;
if (searchOptions.NullCheck)
{
var notNullProperty = ExpressionHelper.BuildNotNullExpression(stringProperty);
var notNullSearchFor = ExpressionHelper.BuildNotNullExpression(propertyToSearchFor);
finalExpression = ExpressionHelper.JoinAndAlsoExpression(notNullProperty, notNullSearchFor);
}
finalExpression = ExpressionHelper.JoinAndAlsoExpression(finalExpression, endsWithExpresion);
return(Expression.IsTrue(finalExpression));
}
