CODEWITHSUNDEEP
c#.net
Shantanu Gupta
Shantanu Gupta

Reputation: 21108

How can i add a new Function or Property on textbox class's text property

I want to add one more function/property to a text property of a textbox like this. txtControl.Text.IsEmpty(); or txtControl.Text.IsEmpty; which returns me bool value.

I dont want to compare for empty string every time.

i.e. if(txtControl.text==string.Empty) {} else {}

Can we do some other way also

if just want to do it like if(txtControl.text.isEmpty){}

Upvotes: 1

Views: 6179

Answers (5)

edosoft
edosoft

Reputation: 17281

The text property is a string. The string class contains a static method IsNullOrEmpty() So you could use if (String.IsNullOrEmpty(txtControl.Text)) {} else {}

Option2 is to create a extra property on the textbox:

public class MyTextbox : Textbox
{
  public bool IsEmpty
  { 
    get
    { 
      return String.IsNullOrEmpty(this.Text);
    }
  }
}

You can use it like this: if (txtMyTextbox.IsEmpty) {} else {}

Upvotes: 2

this. __curious_geek
this. __curious_geek

Reputation: 43217

In c# 3.0 you can do something like this..

namespace ExtensionMethods
{
    public static class MyExtensions
    {
        public static bool IsTextEmpty(this Textbox txtBox)
        {
            return string.IsNullOrEmpty(txtBox.Text);
        }
    }   
}

Then you can use it like this.

bool isEmpty = yourTxtBox.IsTextEmpty();

This will work for all textbox instances across your application, provided you have referred the namespace of extension method. If you have your custom textbox then replace the type TextBox with the type of your custom Textbox. It may look like this if you have your own TextBox..

namespace ExtensionMethods
{
    public static class MyExtensions
    {
        public static bool IsTextEmpty(this MyTextbox txtBox)
        {
            return string.IsNullOrEmpty(txtBox.Text);
        }
    }   
}

Upvotes: 8

kurige
kurige

Reputation: 3779

String.IsNullOrEmpty( textControl.Text )

Upvotes: 0

Oded
Oded

Reputation: 499382

The Text property is a string, which already has a IsNullOrEmpty function on it.

Upvotes: 0

David M
David M

Reputation: 72930

Why not create an extension method:

public static bool HasEmptyText(this TextBox textBox)
{
    return string.IsNullOrEmpty(textBox.text);
}

Then you can just use txtControl.HasEmptyText().

Upvotes: 2

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