How to create a 'startswith' function inside a class

Question

I'm working in List and storing my data in class and again using new list to differentiate between receive data.

I'm using startswith function to check for data inside a string. But i also want to call startswith function inside loop with string is data form class. I can't add startwith because my class don't have definition for this function

Below is demo code help you understand what i'm asking

 class URLClass
{
    public URLClass()
    {

    }

    //packet count
    private int pktCount;
    public int PktCount
    {
        get { return pktCount; }
        set { pktCount = value; }
    }

    //URL accessed
    private string uRLString;
    public string URLString
    {
        get { return uRLString; }
        set { uRLString = value; }
    }}

This is a class data... I used a list for class data and name it URLData

Below code is the loop

foreach (var x in URLData) //URLData is list from above class
{
  if (x.StartsWith("SomeText")) // Here i face problem my class don't have any definition of Sartswith function is there any way i can define it manually
}

you need to make a "StartsWith" method in your class, and have it do it what you want to. — oppassum, Feb 15 '18 at 15:57
I think you might just want `x.URLString.StartsWith("SomeText")` but it's not completely clear. — juharr, Feb 15 '18 at 15:58
What should start with this text? if URLString property should start you can use that method...x.URLString.StartsWith("SomeText")... — Johnny, Feb 15 '18 at 15:59
@FCin `StartsWith` is not an extension method. It's just a regular method of `string`. — juharr, Feb 15 '18 at 15:59
I think you just need to do "if (x.uRLString.Startswith("SomeText"))" — Paul Gibson, Feb 15 '18 at 16:01
Yes but how can i use 'startswith' in class like how to create it's method? — Talha Shafique, Feb 15 '18 at 16:01
@PaulGibson Yeah this is good.. But i need it to define in class — Talha Shafique, Feb 15 '18 at 16:03
If you don't know how to create a method in a class, you need way more tutorials than we can help with. — oppassum, Feb 15 '18 at 16:04

score 1 · Answer 1 · answered Feb 15 '18 at 16:04

If you can't modify your URLClass to add the StartsWith method, you can still provide an extension method which may be equally useful.

public static class MyURLClassExtensions {
    public static bool StartsWith(this URLClass me, string text) {
        return me.URLString.StartsWith(text);
    }
}

Joel Coehoorn · Answer 2 · 2018-02-15T16:08:21.523

Add the method to the class:

class URLClass
{
    public URLClass()
    {

    }

    //packet count
    private int pktCount;
    public int PktCount
    {
        get { return pktCount; }
        set { pktCount = value; }
    }

    //URL accessed
    private string uRLString;
    public string URLString
    {
        get { return uRLString; }
        set { uRLString = value; }
    }}

    public bool StartsWith(string match)
    {
        return uRLString.StartsWith(match);
    }

OR

Use the string property in the loop:

foreach (var x in URLData) 
{
    if (x.URLString.StartsWith("SomeText"))
}

Either should work, and it's all pretty basic 101-level stuff.

You can also do this:

foreach (var x in URLData.Where(u => u.URLString.StartsWith("SomeText")))
{

}

How to create a 'startswith' function inside a class

2 Answers2