C# Lambda 表达式未返回预期结果

发布于 2024-08-03 00:51:28 字数 787 浏览 5 评论 0原文

我正在使用 lamda 表达式来过滤查询。

基本上，我的行由段组成，这些段被标记为已删除、已插入或为空。

我想要返回的是已标记为已删除但其任何同级未标记为已删除的段。例如，

Line: "Soylent Green is people!" Broken into 2 segments... 
Segment 1: "Soylent Green " (marked as deleted)
Segment 2: "is people!" (not marked as deleted)

应该返回段 1。但下一个示例，

Line: "Open the pod bay doors Hal!" Broken into 3 segments...
Segment 1: "Open the " (marked as deleted)
Segment 2: "pod bay " (marked as deleted)
Segment 3: "doors Hal!" (marked as deleted)

不应返回任何段。请参阅下面的代码：

return seg => seg.ModType == Deleted &&
              seg.Line.Segments.Any(segs => segs.ID != seg.ID && 
              segs.ModType != Deleted);

谢谢，我很感谢任何关于为什么这不起作用的帮助或建议。

原文

I am using a lamda expression to filter a query.

Basically, I have lines that are composed of segments and these segments are marked as deleted, inserted or null.

What I want returned are segments that have been marked as deleted but whose any sibling IS NOT marked as deleted. As an example,

Line: "Soylent Green is people!" Broken into 2 segments... 
Segment 1: "Soylent Green " (marked as deleted)
Segment 2: "is people!" (not marked as deleted)

Should return me Segment 1. But the next example,

Line: "Open the pod bay doors Hal!" Broken into 3 segments...
Segment 1: "Open the " (marked as deleted)
Segment 2: "pod bay " (marked as deleted)
Segment 3: "doors Hal!" (marked as deleted)

Should not return any segments. See code below:

return seg => seg.ModType == Deleted &&
              seg.Line.Segments.Any(segs => segs.ID != seg.ID && 
              segs.ModType != Deleted);

Thanks and I appreciate any help or suggestion as to why this is not working.

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葬花如无物 2024-08-10 00:51:28

我想它会是这样的：

return s =>  from segment in s.Line.Segments 
             where segment.ModType == Deleted 
                && segment.Line.Segments.Any(segs => segs.ModType != Deleted)
             select segment

I'd think it would be something like:

return s =>  from segment in s.Line.Segments 
             where segment.ModType == Deleted 
                && segment.Line.Segments.Any(segs => segs.ModType != Deleted)
             select segment

回复收藏 0 原文

や莫失莫忘 2024-08-10 00:51:28

使用Where()而不是Any()，它将返回一个IEnumerable对象。正如 Jon 所说，Any() 返回一个布尔值。

回复收藏 0 原文

疯到世界奔溃 2024-08-10 00:51:28

由于 ModType 可为空，因此它没有返回我所期望的内容。代码应该是...

return seg => seg.ModType == Deleted &&
          seg.Line.Segments.Any(segs => segs.ID != seg.ID && 
          (segs.ModType != Deleted || segs.ModType == null));

感谢所有回复并提出意见和建议的人！

Since ModType is nullable, it did not return what I was expecting. The code should be...

return seg => seg.ModType == Deleted &&
          seg.Line.Segments.Any(segs => segs.ID != seg.ID && 
          (segs.ModType != Deleted || segs.ModType == null));