Check all string in comma separated string exist in other using C# and VB.Net in ASP.Net

Last Reply 3 days ago By manvendra45

Posted 4 days ago

How to check all value with comma-separated exist in other parent comma separated in  c#

Suppose we have two string with comma-separated

for example  

string ParentString ="AAA,BBB,CCC";

String childstring ="BBB,CCC"

it must return true because all child string matched in parentstring

second example  

string ParentString ="AAA,BBB,CCC";

String childstring ="AA,CCC"

In this case, it must return false, because "AA" does not match any words which are comma-separated in ParentString 

Please help me, anyone, I had tried with Split and Contain function, but fail.

Posted 4 days ago Modified on 3 days ago

Hi manvendra45,

Refer below sample code.



protected void Page_Load(object sender, EventArgs e)
    if (!this.IsPostBack)
        string parentString = "AAA,BBB,CCC";
        string[] parentarray = parentString.Split(',');
        string childstring = "AAA,AA,CCC";
        string[] childarray = childstring.Split(',');
        string notmatchvalue = "";
        foreach (var child in childarray)
            Boolean checkExists = Array.Exists(parentarray, x => x == child);
            if (checkExists == false)
                notmatchvalue = child;


Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim parentString As String = "AAA,BBB,CCC"
        Dim parentarray As String() = parentString.Split(","c)
        Dim childstring As String = "AAA,AA,CCC"
        Dim childarray As String() = childstring.Split(","c)
        Dim notmatchvalue As String = ""
        For Each child In childarray
            Dim checkExists As Boolean = Array.Exists(parentarray, Function(x) x = child)
            If checkExists = False Then
                notmatchvalue = child
                Exit For
            End If
    End If
End Sub


Posted 3 days ago Modified on 3 days ago

Here is anwser using Array 

string parentString = "AAA,BBB,CCC";
String[] parentarray=parentString.Split(',') ;//fill string as element in Array
string childstring = "AAA,AA,CCC";
childstring =childstring.split(',');
string notmatchvalue="";  
foreach (var child in childstring )
    Boolean checkExists = Array.Exists(parentarray, x => x ==child );
    if(checkExists ==false)
        notmatchvalue=child //  do whatever want 
        break ;// it will break the foreach loop once get false and it will show this value is not matched with parentarray element 

in this case "AA" will retrun false becuase it will not match to any array element.