call contructor twice in c#

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I wrote a program works like the notepad with win form.

I want to open some txt file, and display them.

I have a class called DirtyCheckingTextBox which derived from TextBox,
I use the DirtyCheckingTextBox tbxContent in the form to display text.

in the openMenu click event :

C#

{
  // .. openfiledialog stuff
  var content = FileServices.GetContent(fileName); // get the txt content
  tbxContent = new DirtyCheckingTextbox(content);
}

the Constructor:

C#

 public DirtyCheckingTextbox() : this(String.Empty)
 {
 }

public DirtyCheckingTextbox(string initialText)
{
    this.Text = initialText;
    this.CleanText = this.Text;
}

but the problem is that I found the the debug window the tbxContent.Text has the txt files content, but the form doesn't display the text, why?

by default the tbxContent call the default constructor, I think the problem maybe I call the constructor again new DirtyCheckingTextbox(content);

Posted 12-Mar-14 1:21am

JohnsonYuan

Updated 12-Mar-14 1:22am

v2

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ZurdoDev 12-Mar-14 7:22am

You need to add tbxContent to the form, right? The way you have it now, it is only in memory.

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S Houghtelin · Answer 1 · 2014-03-12T01:45:00

Solution 1

As RyanDev said the testbox needs to be added to the form.

C#

TextBox DirtyCheckingTextbox= new TextBox();
DirtyCheckingTextbox.Location = new Point(200, 200);
this.Controls.Add(DirtyCheckingTextbox);
DirtyCheckingTextbox.Text = content ;

Good luck.

Posted 12-Mar-14 1:45am

S Houghtelin

OriginalGriff · Answer 2 · 2014-03-12T01:47:00

The problem is that you are creating a new instance of the DirtyCheckingTextbox and assigning it to the tbxContent variable - which doesn't display it, or update the version which is already on the display.

Instead, move your code into a method, and call that:

C#

public DirtyCheckingTextbox() : this(String.Empty)
    {
    }
    
public DirtyCheckingTextbox(string initialText)
    {
    Reset(initialText);
    }

public void Reset(string initialText)
    this.Text = initialText;
    this.CleanText = this.Text;
    }

C#

{
// .. openfiledialog stuff
var content = FileServices.GetContent(fileName); // get the txt content
tbxContent.Reset(content);
}

[edit]Types - very odd typos - OriginalGriff[/edit]