How to sort part of items in generic list

I have a List object that contains items in following type

public class Item{

    public int Type; //this can be only 0 or 1
    public string Text;


}

I would like to sor开发者_StackOverflow中文版t the entire list by the Type first and then do another sort by Text for only items that have type is 1?

How to achieve this?

Many thanks

Ming

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Here's how I'd do it.

var ordered = list.OrderBy(i => i.Type == 0 ? "" : i.Text);

This is assuming there are no empty Text strings where i == 0. If you can't make that assumption, the following would work:

var ordered = list.OrderBy(i => i.Type).ThenBy(i => i.Type == 0 ? "" : i.Text);

By giving all items with a 0 Type the same value, you'll leave them all in their initial order, while sorting other items by their Text value.

On a side note, this is a code smell:

public int Type; //this can be only 0 or 1

At a glance, that sounds like it ought to be a boolean or a custom enum type. After taking a deeper look at what you're trying to do, it sounds like maybe you're not expecting Text to even be a legitimate value if Type is 0. If that's the case, you should consider using class inheritance to actually differentiate one item type from another.

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Your question isn't perfectly clear. It sounds like you want TWO different sorts, not a sort on one field, and then a stable re-sort when the Type equals 1?

Assuming the former:

var sortByType = items.OrderBy(x => x.Type)
                      .ToList();
var sortTheOnesByText = items.Where(x => x.Type == 1)
                             .OrderBy(x => x.Text)
                             .ToList();

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List<Item> items;

items = items.OrderBy(i => i.Type).ThenBy(i => i.Type == 1 ? i.Text : null);

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Implement IComparable<Item> See details with example msdn And than just use List<T>.Sort() method

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I think you mean you want to put all the type=0 at the front and all the type=1 at the back, and also sort by text where type=1.

items.OrderBy(item => item.Type).ThenBy (item => type == 0 ? "" : item.Text)

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If you don't mind ordering Type 0 items as well then you can do

var sortedItems = items.OrderBy(i => i.Type).ThenBy(i => i.Text);

Otherwise, if you need to preserve the original order for Type 0 items, then you can do

var sortedItems = items.OrderBy(i => i.Type).ThenBy(i => i.Type == 0 ? "A" : i.Text);