Write a method which searches an array for a string value

Hello Kenny,

You can use one of the below methods in C#.Net

string [] arr = {"One","Two","Three"};
var target = "One";
var results = Array.FindAll(arr, s => s.Equals(target));

bool has = arr.Contains(var); // .NET 3.5
or
bool has = Array.IndexOf(arr, var) >= 0;

List testing = new List();
testing.Add("One");
testing.Add("Two");
testing.Add("Three");
testing.Add("Mouse");
bool inList = testing.Contains("Mouse");

bool exists = arr.Contains("One");

string[] stringArray = { "text1", "text2", "text3", "text4" };
string value = "text3";
int pos = Array.IndexOf(stringArray, value);
if (pos > -1)
{
return true;
}
else
{
return false;
}

int findString(String var, String[] stringArray, int currentIndex, int stringMaxIndex)
{
if currentIndex > stringMaxIndex
return (-stringMaxIndex-1);
else if var==arr[currentIndex] //or use any string comparison op or function
return 0;
else
return findString(var, stringArray, currentIndex++, stringMaxIndex) + 1 ;
}
//calling code
int index = findString(var, arr, 0, getMaxIndex(arr));
if index == -1 printOnScreen("Not found");
else printOnScreen("Found on index: " + index);

You can check the element existence by
arr.Any(x => x == "One")

https://www.c-sharpcorner.com/blogs/array-search-in-c-sharp1

5 Replies

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Suraj Kumar8y ago
You have not asked the question related to your problem specific you are facing. You are requested to give the details what you are doing and where you have stucked? Share some code snipet for better standing of your problem.
Ken J8y ago
I have a problem each code didn't work.
Ken J8y ago
Thanks you very much
Suraj Kumar8y ago
Hello Kenny,
You can use one of the below methods in C#.Net
string [] arr = {"One","Two","Three"};
var target = "One";
var results = Array.FindAll(arr, s => s.Equals(target));
bool has = arr.Contains(var); // .NET 3.5
or

bool has = Array.IndexOf(arr, var) >= 0;
List testing = new List();
testing.Add("One");
testing.Add("Two");
testing.Add("Three");
testing.Add("Mouse");
bool inList = testing.Contains("Mouse");
bool exists = arr.Contains("One");
string[] stringArray = { "text1", "text2", "text3", "text4" };
string value = "text3";
int pos = Array.IndexOf(stringArray, value);
if (pos > -1)
{
    return true;
}
else
{
    return false;
}
int findString(String var, String[] stringArray, int currentIndex, int stringMaxIndex)
    {
    if currentIndex > stringMaxIndex
       return (-stringMaxIndex-1);
    else if var==arr[currentIndex] //or use any string comparison op or function
       return 0;
    else
       return findString(var, stringArray, currentIndex++, stringMaxIndex) + 1 ;
    }



    //calling code
    int index = findString(var, arr, 0, getMaxIndex(arr));

    if index == -1 printOnScreen("Not found");
    else printOnScreen("Found on index: " + index);
You can check the element existence by

arr.Any(x => x == "One")
https://www.c-sharpcorner.com/blogs/array-search-in-c-sharp1
Ken J8y ago
I'm new to C# and I want to know what to type up the code. Thanks.