Question

Hi I have a MultiSelectList that I want to split into several smaller MultiSelectList, depending on the value (NOT the selectedValues), and I want to use LINQ to achieve that...sure it is possible but I can t cut it..any suggestions? Thanks.

Answer 1

这是你想要的:

var multiSelectList= new MultiSelectList(new List<string>()); //your mutli-select list
var multiSelectListGroupedByValue=ms.GroupBy(x => x.Value)
                                  .Select(x=>new MultiSelectList(x.Select(y=>y.Value)));

Answer 2

采用该守则(从https://stackoverflow.com/questions/438188/split-a- Collection-into-n-parts-with-linq>)。将收集材料带入“N”部分,并配有LINQ?

static class LinqExtensions
{
 public static IEnumerable<IEnumerable<T>> Split<T>(this IEnumerable<T> list, int parts)
 {
     int i = 0;
     var splits = from item in list
                  group item by i++ % parts into part
                  select part.AsEnumerable();
     return splits;
 }
}

Answer 3

我希望这是你们需要的。

@{
    var array = new int[] { 1,2,3,4,5,6,7,8,9,10 };
}

@Html.ListBox("lstBoxLessThan5",new MultiSelectList(array.Where(a => a < 5).ToArray()));
<br />
@Html.ListBox("lstBoxMorethan5",new MultiSelectList(array.Where(a => a > 5).ToArray()));

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