C# 使用 Linq 检查列表中的字符串是否包含特定字符串
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Check if a string within a list contains a specific string with Linq
提问by Saeid Yazdani
I have a List<string>that has some items like this:
我有一个List<string>有一些这样的项目：
{"Pre Mdd LH", "Post Mdd LH", "Pre Mdd LL", "Post Mdd LL"}
Now I want to perform a condition that checks if an item in the list contains a specific string. something like:
现在我想执行一个条件来检查列表中的项目是否包含特定字符串。就像是：
IF list contains an item that contains this_string
IF list contains an item that contains this_string
To make it simple I want to check in one go if the list at least! contains for example an item that has Mdd LHin it.
为了简单起见，我想至少在列表中检查一次！包含例如一个项目Mdd LH。
I mean something like:
我的意思是这样的：
if(myList.Contains(str => str.Contains("Mdd LH))
{
//Do stuff
}
Thanks.
谢谢。
采纳答案by Jon Skeet
I think you want Any:
我想你想要Any：
if (myList.Any(str => str.Contains("Mdd LH")))
It's well worth becoming familiar with the LINQ standard query operators; I would usually use those rather than implementation-specific methods (such as List<T>.ConvertAll) unless I was really bothered by the performance of a specific operator. (The implementation-specific methods can sometimes be more efficient by knowing the size of the result etc.)
熟悉LINQ 标准查询运算符是非常值得的；我通常会使用那些而不是特定于实现的方法（例如List<T>.ConvertAll），除非我真的被特定运算符的性能所困扰。（通过了解结果的大小等，特定于实现的方法有时会更有效。）
回答by ?yvind Br?then
Thast should be easy enough
这应该很容易
if( myList.Any( s => s.Contains(stringToCheck))){
//do your stuff here
}
回答by slugster
Try this:
尝试这个：
bool matchFound = myList.Any(s => s.Contains("Mdd LH"));
The Any()will stop searchingthe moment it finds a match, so is quite efficient for this task.
该Any()会停止搜索找到一个匹配的时刻，所以是这个任务相当有效率。
回答by sll
LINQ Any() would do the job:
LINQ Any() 可以完成这项工作：
bool contains = myList.Any(s => s.Contains(pattern));
Determines whether any element of a sequence satisfies a condition
确定序列的任何元素是否满足条件
回答by Rafael Diego Nicoletti
If yoou use Contains, you could get false positives. Suppose you have a string that contains such text: "My text data Mdd LH" Using Contains method, this method will return true for call. The approach is use equals operator:
如果您使用包含，您可能会得到误报。假设您有一个包含这样文本的字符串：“My text data Mdd LH” 使用 Contains 方法，此方法将返回 true 以供调用。方法是使用等于运算符：
bool exists = myStringList.Any(c=>c == "Mdd LH")
bool exists = myStringList.Any(c=>c == "Mdd LH")
