how to exclude items from List<RegistryPathData>

user_584018 0
Viewed 67

I have a string array and a list and data is like below,

string[] str = new string[2] { "Prod1", "Prod2" };
        List<RegistryPathData> data = new List<RegistryPathData>
        {
            new RegistryPathData{AppName="test1", RegPath="Prod1|Version"},
            new RegistryPathData{AppName="test2", RegPath="Prod2|Version"},
            new RegistryPathData{AppName="test3", RegPath="Prod3|Version"},
            new RegistryPathData{AppName="test4", RegPath="Prod4|Version"},
            new RegistryPathData{AppName="test5", RegPath="Prod5|Version"},
        };

Now I want to exclude items from List<RegistryPathData> which is NOT matching with string array (prod1 & prod2). Need to exclude below 2, how to do this?

new RegistryPathData{AppName="test1", RegPath="Prod1|Version"},
        new RegistryPathData{AppName="test2", RegPath="Prod2|Version"},
c#
3 Answers

Use List.RemoveAll() function like this.

data.RemoveAll(d => str.Contains(d.RegPath.Split('|')[0]));

Deathstick_590810

You can use the LINQ .Where() method to filter a sequence of values based on a predicate. 

data.Where(d => !str.Contains(d.RegPath.Split('|')[0]));

This means filter out the items in the list where the string up to the first pipe character is not contained in the str array.

user_28549930

Use the Where method from LINQ and then check if any of the strings inside the str array match with the RegPath of the current object. Like this:

List<RegistryPathData> dataOnlyProd1And2 = data
    .Where(rpd => str.Any(s => rpd.RegPath.StartsWith(s)))
    .ToList();
user_62777550
Related