/[xmltv_parser]/trunk/libxmltv/Extensions.cs
ViewVC logotype

Annotation of /trunk/libxmltv/Extensions.cs

Parent Directory Parent Directory | Revision Log Revision Log


Revision 198 - (hide annotations) (download)
Sat Mar 16 22:25:41 2013 UTC (6 years, 11 months ago) by william
File size: 2842 byte(s)
Cbunk Extension:
* make sure to call .ToList() before returing data to instantiate the return IEnumerable<T> data

1 william 141 using System;
2     using System.Collections.Generic;
3     using System.Linq;
4     using System.Text;
5 william 197 using System.Diagnostics;
6 william 141
7     namespace libxmltv
8     {
9 william 159 public static class DateTimeStringConverter
10 william 141 {
11     private const string DEFAULT_DATE_FORMAT = "yyyy/MM/dd hh:mm tt";
12     public static string ToDateTimeString(this DateTime dt)
13     {
14     return dt.ToDateTimeString(DateTimeStringConverter.DEFAULT_DATE_FORMAT);
15     }
16     public static string ToDateTimeString(this DateTime dt, IFormatProvider provider)
17     {
18     return dt.ToString(provider);
19     }
20     public static string ToDateTimeString(this DateTime dt, string format)
21     {
22     return dt.ToString(format);
23     }
24     public static string ToDateTimeString(this DateTime dt, string format, IFormatProvider provider)
25     {
26     return dt.ToString(format, provider);
27     }
28     }
29    
30 william 196 public static class extensions
31     {
32 william 197 public static IEnumerable<IEnumerable<T>> Chunk<T>(this IEnumerable<T> source,
33     int chunkSize)
34 william 196 {
35 william 197 // Validate parameters.
36     if (source == null) throw new ArgumentNullException("source");
37     if (chunkSize <= 0) throw new ArgumentOutOfRangeException("chunkSize",
38     "The chunkSize parameter must be a positive value.");
39    
40     // Call the internal implementation.
41 william 198 return source.ChunkInternal(chunkSize).ToList();
42 william 197 }
43     private static IEnumerable<IEnumerable<T>> ChunkInternal<T>(this IEnumerable<T> source, int chunkSize)
44     {
45     // Validate parameters.
46     Debug.Assert(source != null);
47     Debug.Assert(chunkSize > 0);
48    
49     // Get the enumerator. Dispose of when done.
50     using (IEnumerator<T> enumerator = source.GetEnumerator())
51     do
52     {
53     // Move to the next element. If there's nothing left
54     // then get out.
55     if (!enumerator.MoveNext()) yield break;
56    
57     // Return the chunked sequence.
58 william 198 yield return ChunkSequence(enumerator, chunkSize).ToList();
59 william 197 } while (true);
60     }
61     private static IEnumerable<T> ChunkSequence<T>(IEnumerator<T> enumerator, int chunkSize)
62     {
63     // Validate parameters.
64     Debug.Assert(enumerator != null);
65     Debug.Assert(chunkSize > 0);
66    
67     // The count.
68     int count = 0;
69    
70     // There is at least one item. Yield and then continue.
71     do
72 william 196 {
73 william 197 // Yield the item.
74     yield return enumerator.Current;
75     } while (++count < chunkSize && enumerator.MoveNext());
76 william 196 }
77     }
78 william 141 }

  ViewVC Help
Powered by ViewVC 1.1.22