英文:
How do I get a list with only the objects of the group(s) using LINQ?
问题
我只需要在宽度值为100的情况下获取分组对象的标题。在这个示例中，这将是列1的分组标题。一个包含两个标题的列表。
var result = title.GroupBy(c => c.Column).?
英文:
I have an objects table with columns and widths.
| column (int) | width (double) |
|---|---|
| 0 | 100 |
| 0 | 105 |
| 1 | 100 |
| 1 | 100 |
I only need the group objects title where the width values are 100.
In the example, this would be the group title with column 1. A list with two titles.
var result = title.GroupBy(c => c.Column).?
答案1
得分: 3
var result = title
.GroupBy(c => c.Column)
.Where(g => g.All(t => t.Width == 100))
.SelectMany(g => g);
英文:
var result = title
.GroupBy(c => c.Column)
.Where(g => g.All(t => t.Width == 100))
.SelectMany(g => g);
Here is Dotnet Fiddle demo
答案2
得分: 0
我只需要所有值的宽度都等于100的组对象标题。你的对象只有一个'Column'和一个'Width'。或者你是指你的对象还有一个'Title'吗？
首先，一些定义，这样更容易谈论事情。
class MyObject
{
public string Title {get; set;}
public int Column {get; set;}
public double Width {get; set;}
}
IEnumerable<MyObject> myObjects = ... // 你想要处理的集合
这样怎么样：
var result = myObjects.Where(obj => obj.Width == 100.0)
.Select(obj => obj.Title);
换句话说，从你的原始MyObjects序列中，只保留那些Width属性的值等于100.0的MyObjects。然后从剩下的每个MyObject中，只选择Title属性的值。
英文:
> I only need the group objects title where all values width are equal to 100.
I understand the part "where all values widht are equal to 100.0". I don't understand the "I only need the group objects title". Your objects have only a 'Column' and a 'Width'. Or do you mean that your objects also have a 'Title'?
First some definitions, this makes it easier to talk about things.
class MyObject
{
public string Title {get; set;}
public int Column {get; set;}
public double Width {get; set;}
}
IEnumerable<MyObject> myObjects = ... // the collection that you want to process
How about this:
var result = myObjects.Where(object => object.Width == 100.0)
.Select(object => object.Title);
In words: from your original sequence of MyObjects in variable myObjects, keep only those MyObjects that have a value for property Width that equals 100.0. From each of the remaining MyObjects select only the value of property Title.
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