添加索引LINQ查询结果 [英] adding index to linq query result

问题描述

我有一个LINQ查询，返回MyObject的列表。我想补充一个属性为myObject称为TheIndex以及包含该项目的序列中的坐标。

I have a linq query that returns a list of MyObject. I'd like to add a property to MyObject called TheIndex and that contains the ordinate of the item in the sequence.

在换句话说，我需要的是这样的：

In other words, I need something like this:

var TheResult = from d in MyDataContext
                where.....
                select new MyObject
                {
                   Property1 = d.whatever,

                   TheIndex = ?

                 }

该查询返回MyObject的名单，我想在列表中的每个项目包含索引作为其属性之一。

The query returns a list of MyObject and I'd like each item in the list to contain the index as one of its property.

感谢。

推荐答案

一旦你得到的查询语法的时候，你会发现一个选择的过载，让你你要找的索引。

Once you get away from the query syntax, you'll find a Select overload that gives you the index you're looking for.

var result = MyDataContext
   .Where(d => d.Prop == "A")
   .AsEnumerable()
   .Select((d, i) => 
      new MyObject() {
         Property1 = d.whatever,
         TheIndex = i
    });

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