如何在List<object>中搜索对象具有其字段值 [英] How to search for an object in List&lt;object&gt; having its field value

问题描述

问题是如何从具有字段值的List中获取对象

The question is how to get an object from List having its field value

我有一个名为f_objects的列表，里面充满了对象.

I have got list called f_objects filled with objects.

private List<F_object> f_objects;

我还有一个带有某些值的字符串:

i've got also a string with some value :

string name = "something";

F_object有一个返回其名称为name的字段的方法:

F_object got a method returning its field called name:

public string GetName()
{
    return this.name;
}

是否有用于比较列表中的对象与此字段值的内置方法?还是我应该做一个循环并像这样比较:

Is there a built in method for compare objects in list vs this field value ? Or should i make a loop and compare like this:

foreach(F_object ob in f_objects)
{
    if String.Equals(name, ob.GetName())
    F_object found = ob;
} 

推荐答案

在linq中有多种方法可以做到这一点.第一个是使用 .Where .如果有更多的匹配项，这将满足您的需求

There are multiple ways of doing this in linq. First one is to use .Where. This would suite your needs if there can be more matches

IEnumerable<F_object> result = f_objects.Where(obj=>obj.GetName() == name);

第二个选项是，如果您只关心第一个匹配项，即使可能有多个匹配项，在这种情况下，请使用 .First

Second option is if you are only concerned about the first hit, even if there could be more than one, in that case use .First

f_object result = f_objects.First(obj=>obj.GetName() == name);

或者零击是一种可接受的情况(非例外)

or if zero hits is an accepted situation (non-exceptional)

f_object result = f_objects.FirstOrDefault(Obj=>obj.GetName() == name);

如果您一次只能点击一次，请使用 .Single

if you should only ever have one hit then use .Single

f_object result = f_objects.Single(obj=>obj.GetName() == name);

，或者如果您只有一次或零次点击，则使用 .SingleOrDefault

or if you can have only one or zero hits then use .SingleOrDefault

f_object result = f_objects.SingleOrDefault(obj=>obj.GetName() == name);

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