protected override Expression CompareValue(Expression left, Expression right, Type type)
{
if (type != typeof(string))
{
throw FilterErrors.TheOperatorCanOnlyUserForStringType(this.Operator);
}
return(Expression.Call(left, Method.Value, right));
}
protected override Expression CompareValue(Expression left, Expression right, Type type)
{
var dataType = Nullable.GetUnderlyingType(type) ?? type;
var comparableType = typeof(IComparable <>).MakeGenericType(dataType);
if (!comparableType.IsAssignableFrom(dataType))
{
throw FilterErrors.TheOperatorCanOnlyUserForComparableType(this.Operator);
}
if (SupportOpTypes.Contains(dataType))
{
return(CompareFunc(left, right));
}
else
{
var method = comparableType.GetMethod(nameof(IComparable.CompareTo), new Type[] { dataType });
return(CompareFunc(Expression.Call(left, method, right), Expression.Constant(0)));
}
}
