/// <inheritdoc />
public Expression GenerateComparisonExpression(string navigationPropertyName, LinqExpressionListOperator expressionListOperator, ParameterExpression parameter, LambdaExpression lambda)
{
// Parse property name
Expression member = GenerateMemberExpression(parameter, navigationPropertyName);
MethodInfo methodInfo = null;
switch (expressionListOperator)
{
case LinqExpressionListOperator.AnyLambda:
// Get a reference to Enumerable.Any() method
methodInfo = typeof(Enumerable).GetMethods().First(m => m.Name == "Any" && m.GetParameters().Length == 2);
break;
case LinqExpressionListOperator.FirstLambda:
// Get a reference to Enumerable.First() method
methodInfo = typeof(Enumerable).GetMethods().First(m => m.Name == "First" && m.GetParameters().Length == 2);
break;
default:
return(null);
}
// Create new method and return a call to it
Type type = parameter.Type.GetProperty(navigationPropertyName)?.PropertyType.GetGenericArguments()[0];
methodInfo = methodInfo.MakeGenericMethod(type);
return(Expression.Call(methodInfo, member, lambda));
}
/// <inheritdoc />
public Expression GenerateComparisonExpression <T>(NewArrayExpression leftArrayExpression, LinqExpressionListOperator expressionListOperator, LambdaExpression lambda)
{
// Get a reference to Enumerable.Any() method
MethodInfo anyMethodInfo = typeof(Enumerable).GetMethods().First(m => m.Name == "Any" && m.GetParameters().Length == 2);
// Create new method and return a call to it
anyMethodInfo = anyMethodInfo.MakeGenericMethod(typeof(T));
return(expressionListOperator switch
{
LinqExpressionListOperator.AnyLambda => Expression.Call(anyMethodInfo, leftArrayExpression, lambda),
_ => null
});
