public static Expression GetPyszmExp(MemberExpression argument, IEdmFunctions funcs)
{
if (funcs == null)
{
throw new NotSupportedException("DQuery functions not specified.");
}
var pyszm = funcs.GetPyszmFunc();
if (pyszm == null)
{
throw new NotImplementedException("Pyszm function not implemented.");
}
return(Expression.Call(null, pyszm.Method, argument));
}
public static IQueryable <TSource> Where <TSource>(this IQueryable <TSource> source, string json, IEdmFunctions funcs)
where TSource : class
{
var clauses = QueryClauseParser.Parse(json);
var lambda = ExpressionBuilder.Build <TSource>(clauses.ToList(), funcs);
return(source.Where(lambda));
}
public static Expression <Func <TSource, bool> > Build <TSource>(List <QueryClause> clauses, IEdmFunctions funcs)
{
var parameter = Expression.Parameter(typeof(TSource), "x");
var builder = new ExpressionBuilder {
EdmFunctions = funcs
};
var expression = builder.BuildClauseExp <TSource>(clauses, parameter);
if (expression == null)
{
expression = Expression.Constant(true);
}
return(Expression.Lambda <Func <TSource, bool> >(expression, parameter));
}
public static IQueryable <TSource> Where <TSource>(this ObjectSet <TSource> source, string json, IEdmFunctions funcs)
where TSource : class
{
return((source as IQueryable <TSource>).Where(json, funcs));
}