如何调试LINQ语句 [英] How to debug a LINQ Statement

问题描述

我有一个Linq对象语句

I have a Linq to objects statement

 var confirm = from l in lines.Lines 
 where (l.LineNumber == startline.LineNumber) || (l.LineNumber == endline.LineNumber) 
 select l;

确认对象在System.Linq.Enumerable处返回Object Null or Not A Reference .WhereListIterator`1.MoveNext（）

The confirm object is returning an 'Object Null or Not A Reference' at at System.Linq.Enumerable.WhereListIterator`1.MoveNext()

如果查询的结果为空，它将返回一个空的枚举器。我知道一个事实，语句中没有空对象。可以通过LINQ语句来查看它在哪里下降吗？

If the result of the query was empty, it would just return an empty enumerator. I know for a fact that there are no null objects in the statement. Is it possible to step through the LINQ statement to see where it is falling over?

编辑当我说，我知道一个事实上没有空对象，原来我在说谎：[但是问题依然存在，尽管如此，尽管如此，答案将是你不能真的

EDIT When I said I know for a fact that there are no null objects it turns out I was lying :[, but the question remains, though I am asuming the answer will be 'you can't really'

LINQPad是一个好主意，我用它来教自己LINQ，但是我可以再次看看它是一个调试/斜线和刻录风格的工具

LINQPad is a good idea, I used it to teach myself LINQ, but I may start looking at it again as a debug / slash and burn style tool

推荐答案

我不知道是否可以从VS进行调试，但是我发现 LINQPad 非常有用。它将让您转储LINQ查询的每个部分的结果。

I'm not sure if it's possible to debug from VS, but I find LINQPad to be quite useful. It'll let you dump the results of each part of the LINQ query.

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