如何检查列表是否包含另一个列表的所有字符串

Question

I have a object list. That object contains a string List. Like that:

public class ObjectA
{
    ...
    IList<string> StringList;
}

And I have a list of words to search on StringList. I need to search on a ObjectA list, and find all ObjectA that have all words (parts of all words).

So I did that:

 List<ObjectA> myObjectList;
 List<string> wordsToFind;  

 var result = myObjectList.Where(objectA => wordsToFind.All(objectA.StringList.Contains));

The problem is my result is getting only whole words (equals). I would like to get results that contains parts of my wordsToFind.

Example

wordsToFind = {"tes","don"};
StringListElement = {"test", "done"}

Should return on my select.

How can I do that?

Answer 1

IndexOf is probably where you want to be, or one of its overloads

Reports the zero-based index of the first occurrence of a specified Unicode character or string within this instance. The method returns -1 if the character or string is not found in this instance.

List<ObjectA> myObjectList;
List<string> wordsToFind;  

var result = myObjectList.Where(x => x.StringList.All(y => wordsToFind.Any(z => y.IndexOf(z) >= 0)));

Also note the time complexity of this is atrocious

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Update

Full Demo Here

Also note, if you want case insensitivity use

y.IndexOf(z, StringComparison.InvariantCultureIgnoreCase) 

or one of the following

• CurrentCulture Compare strings using culture-sensitive sort rules and the current culture.

• CurrentCultureIgnoreCase Compare strings using culture-sensitive sort rules, the current culture, and ignoring the case of the strings being compared.

• InvariantCulture Compare strings using culture-sensitive sort rules and the invariant culture.

• InvariantCultureIgnoreCase Compare strings using culture-sensitive sort rules, the invariant culture, and ignoring the case of the strings being compared.

• Ordinal Compare strings using ordinal (binary) sort rules.

• OrdinalIgnoreCase Compare strings using ordinal (binary) sort rules and ignoring the case of the strings being compared.

Answer 2

I think this should work for you

var wordsToFind = new List<string>{ "tes","don"};
var data= new List<ObjectA>()
{
    new ObjectA()
    {
        StringList = new List<string>{"test", "done", "blah"}
    },
    new ObjectA()
    {
        StringList = new List<string>{"test2", "done2", "blah2"}
    }
};

var result = (from item in data.Select(x => x.StringList)
              from bar in item
              from word in wordsToFind
              where bar.Contains(word)
              select bar)
              .ToList();

The result should give you

"test", "done","test2", "done2"

Answer 3

The ways to do this is by using a combination of Any and All .

You need to check if all the elements of wordsToFind are substring of any elements in StringList

bool result = wordsToFind.All(word => currentObject.StringList.Any(str => str.Contains(word));

This is for one object out of the list of Objects. You can again apply All to that list.