Skip to content

@joelnet /MiniLinq.cs
Created

Embed URL

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Quick examples on how to use MiniLinq
// works in a similar way to LINQ with some minor differences.
using System;
using System.Collections;
using System.Runtime.CompilerServices;
namespace MiniLinqApi
{
[IgnoreNamespace]
internal static class MiniLinq
{
public static LinqObject From(object list)
{
LinqObject value = new LinqObject(list);
return value;
}
}
[IgnoreNamespace]
internal class LinqObject
{
Array list;
ArrayItemMapCallback select;
ArrayItemFilterCallback where;
CompareCallback orderby;
public LinqObject(object list)
{
this.list = Array.ToArray(list);
}
public LinqObject Where(ArrayItemFilterCallback where)
{
this.where = where;
return this;
}
public LinqObject OrderBy(CompareCallback orderby)
{
this.orderby = orderby;
return this;
}
[AlternateSignature]
public extern LinqObject Select();
[AlternateSignature]
public LinqObject Select(ArrayItemMapCallback select)
{
if (select != null)
{
this.select = select;
}
return this;
}
public int Count()
{
return ToArray().Length;
}
public object FirstOrDefault()
{
ArrayList tempList = new ArrayList();
// filter by 'where'
foreach (object item in list)
{
if (where == null || where(item))
{
tempList.Add(item);
if (orderby == null)
{
break;
}
}
}
// perform 'orderby'
if (orderby != null)
{
tempList.Sort(orderby);
}
// process 'select'
if (select != null)
{
for (int i = 0; i < tempList.Count; i++)
{
tempList[i] = select(tempList[i]);
}
}
return tempList.Count > 0 ? tempList[0] : null;
}
public Array ToArray()
{
return (Array)ToList();
}
public ArrayList ToList()
{
ArrayList value = new ArrayList();
// filter by 'where'
foreach (object item in list)
{
if (where == null || where(item))
{
value.Add(item);
}
}
// perform 'orderby'
if (orderby != null)
{
value.Sort(orderby);
}
// process 'select'
if (select != null)
{
for (int i = 0; i < value.Count; i++)
{
value[i] = select(value[i]);
}
}
return value;
}
}
}
// this works with objects too, int used for simplicity.
int[] numbers = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
// [2, 4, 6, 8, 10]
int[] evenNumbers = (int[])MiniLinq
.From(numbers)
.Where(delegate(object o) { return (int)o % 2 == 0; })
.ToArray();
// [10, 9, 8, 7, 6, 5, 4, 3, 2, 1]
int[] descendingNumbers = (int[])MiniLinq
.From(numbers)
.OrderBy(delegate(object x, object y) { return x == y ? 0 : (int)x > (int)y ? -1 : 1; })
.ToArray();
// [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
int[] doubledNumbers = (int[])MiniLinq
.From(numbers)
.Select(delegate(object o) { return (int)o * 2; })
.ToArray();
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Something went wrong with that request. Please try again.