C# filter list of string lists using a string list

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Hey there,
I have a dataview which is filled by an object using string lists. I want pick the suitable entries by typing search words in a textbox.

my object:

C#

class my_object
{
    List<string> column1 = new List<string>();
    List<string> column2 = new List<string>();
    List<string> column3 = new List<string>();
    List<string> column4 = new List<string>(); 
}

my entries for the dataview:

C#

List<my_object> entries = new List<my_object>();

My aim is to filter the entries like the search function in the windows explorer but with the difference that i want to include four columns an not just the column with the filename.
Is there any possibility to do this?

Hope you can help me.

What I have tried:

C#

internal static List<my_object> SearchObject(this List<my_object> Source, List<string> SearchWords)
{
    List<my_object> results = new List<my_object>();

    foreach (my_object m in Source)
    {
        foreach(string s in SearchWords)
        {
            // Filter Column 1
            foreach(string c1 in m.column1)
            {
                if(c1.IndexOf(s) != -1)
                {
                    results.Add(m);
                    break;
                }
            }
        } 
    }

    return results;

    // Problem:
    // This function only filters the first column.
    // If I want to filter the next column, I have to break all 'foreach' blocks 
    // except the '(my_object m in Source)' block...

    // It the 'break' would work for more the one loop, this method would work...
}

Posted 25-Dec-16 8:10am

Tobias Wälde

Updated 25-Dec-16 9:00am

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Comments

Tomas Takac 25-Dec-16 14:58pm

You should not have an object with lists, rather you should have an class with 4 properties and then have a list of that.

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P_Z · Answer 1 · 2016-12-25T09:00:00

Hi, I think result List should contain matches from each column?
If you're using C#, probably should have no problems using Linq

C#

//Source in this case refers to each column
//SearchWords list of strings to search
public List<string> SearchList(List<string> Source, List<string> SearchWords){
//your code can be shortened to Linq query similar to the following
List<string> results = Source.Where(x => SearchWords.Contains(x)).ToList(); 
//in sql this would translate similiar to:
//select Source.Value 
//from Source
//where Source.Value in ('Value1', 'Value2') --SearchWords
return results;
}

Regarding SearchObject, what is the use of passing List<my_object> Source when it seems you need only 1 my_object?
You can use the Linq query for the 4 lists in my_object.

my_object data = new my_objec(); //lists containing all data

List<my_object> entries = new List<my_object>();

So then
entries.column1 = SearchList(data.column1, SearchWords); //similar for the rest