Programming Forums > Application Development > C#

BstrucT · Apr 17th, 2008, 6:12 AM

Hi All

I have decided to implement a little autosave function into my application that is used for datacapturing, but for some reason I am having some trouble.

Example...

Let's say I have three fields that text data can be stored in: txtfield1, txtfield2, and txtfield3.
I also have a seperate btn(bntSave) that when clicked, writes the entered data to the specifics I want it to.

Also add a text box(txtSaveName) used to specify the filename if desired.

Now, the event for the button would look something like this:

(Toggle Plain Text)

private void btnSave1_Click(object sender, EventArgs e)
        {
            StreamWriter write1 = new StreamWriter 
            ( "C:\\" + txtSaveName.Text );

            write1.WriteLine(txtfield1.Text);
            write1.WriteLine(txtfield2.Text);
            write1.WriteLine(txtfield3.Text);

            write1.Close();
         }

Now let's say I want the program to autosave using a timer, can I do the following?

(Toggle Plain Text)

private void timer_Tick(object sender, EventArgs e)
     {
            DateTime autosave = DateTime.Today;
            if (txtSaveName.Visible == true)
            {
                StreamWriter write1 = new StreamWriter
                ("C:\\" + "Auto Saved" + txtSaveName.Text);

            write1.WriteLine(txtfield1.Text);
            write1.WriteLine(txtfield2.Text);
            write1.WriteLine(txtfield3.Text);

            write1.Close();
            }
      }

Or is there an easier way of calling the event for "btnSave"?
My reason for asking is that I have about 90 or so fields that I am working with, so I would like to keep my code clean.

I have tried something similar and it only saved when I minimized the application's window or when I exited, where I wanted it to save more often, but not sure how to activate the autosave function with the timer?

Should I rather let it autosave for, when example, a field is being left, by implementing it's leave event?

All help will be much appreciated.

Thanks

>BstrucT

lectricpharaoh · Apr 17th, 2008, 8:16 AM

First off, you can add all those textboxes to an array or other collection, such that you can iterate through them. This is very handy if you're performing identical operations on multiple textboxes, such as validation, serialization, etc. Stick it in the form's handler for the Load event, or something:

 C# Syntax (Toggle Plain Text) 
// textBoxArray is a class-scope object, so all methods can see it
textBoxArray = new TextBox[NUMBER_OF_TEXTBOXES];
textBoxArray[0] = txtfield1;
textBoxArray[1] = txtfield2;
textBoxArray[2] = txtfield3;  // and so on
// textBoxArray is a class-scope object, so all methods can see it
textBoxArray = new TextBox[NUMBER_OF_TEXTBOXES];
textBoxArray[0] = txtfield1;
textBoxArray[1] = txtfield2;
textBoxArray[2] = txtfield3;  // and so on

Then you can write a method that loops through all of these, and saves them:

 C# Syntax (Toggle Plain Text) 
private bool saveData(string filename)
  {
    try
    {
      StreamWriter sw = new StreamWriter(filename);
      for(int x=0; x<textBoxArray.Length; ++x)
       sw.WriteLine(textBoxArray[x]);
     }
    catch
    {
      return false;
    }
    finally
    {
      if(sw != null)
        sw.Close();
    }
    return true;
}
private bool saveData(string filename)
  {
    try
    {
      StreamWriter sw = new StreamWriter(filename);
      for(int x=0; x<textBoxArray.Length; ++x)
       sw.WriteLine(textBoxArray[x]);
     }
    catch
    {
      return false;
    }
    finally
    {
      if(sw != null)
        sw.Close();
    }
    return true;
}

Now, you can call this method from your timer function, your handler for the save button click, etc. It will let you know if it succeeds or not with the return value (true for success, false for failure).

OpenLoop · Apr 17th, 2008, 5:32 PM

You can set the timer interval to say 120 seconds, and it will save every two minutes by calling timer_tick.

Try this

 c# Syntax (Toggle Plain Text) 
Class asdjkfj
{
  string autoSavePrefix = ""; 
  ...
private void btnSave1_Click(object sender, EventArgs e)
        {
            StreamWriter write1 = new StreamWriter 
            ( "C:\\" + autoSavePrefix + txtSaveName.Text );
 
            write1.WriteLine(txtfield1.Text);
            write1.WriteLine(txtfield2.Text);
            write1.WriteLine(txtfield3.Text);
 
            write1.Close();
         }
....
private void timer_Tick(object sender, EventArgs e)
     {
            DateTime autosave = DateTime.Today;
            if (txtSaveName.Visible == true)
            {
                autoSavePrefix = "Auto Saved";
                btnSave1_Click(null, null);
                autoSavePrefix = "";
            }
      }
Class asdjkfj
{
  string autoSavePrefix = ""; 
  ...
private void btnSave1_Click(object sender, EventArgs e)
        {
            StreamWriter write1 = new StreamWriter 
            ( "C:\\" + autoSavePrefix + txtSaveName.Text );

            write1.WriteLine(txtfield1.Text);
            write1.WriteLine(txtfield2.Text);
            write1.WriteLine(txtfield3.Text);

            write1.Close();
         }
....
private void timer_Tick(object sender, EventArgs e)
     {
            DateTime autosave = DateTime.Today;
            if (txtSaveName.Visible == true)
            {
                autoSavePrefix = "Auto Saved";
                btnSave1_Click(null, null);
                autoSavePrefix = "";
            }
      }

BstrucT · Apr 18th, 2008, 12:39 AM

Wow, thanks for the great advice guys.

@lectricpharaoh:
Thanks for showing me how to implement it by putting all those frisky fields into an array then just work with the array as a whole. This should make my life a lot easier regarding code repitition!

@Openloop:
Will definitely take a closer look at your timer function and see how I can implement it.

Thanks for the great advice guys, gonna get cracking on the code right away!

>BstrucT

Apr 17th, 2008, 6:12 AM	#1
BstrucT Hobbyist Programmer Join Date: Dec 2007 Location: Durban, South-Africa Posts: 132 Rep Power: 1	Autosaving Streams in C# Hi All I have decided to implement a little autosave function into my application that is used for datacapturing, but for some reason I am having some trouble. Example... Let's say I have three fields that text data can be stored in: txtfield1, txtfield2, and txtfield3. I also have a seperate btn(bntSave) that when clicked, writes the entered data to the specifics I want it to. Also add a text box(txtSaveName) used to specify the filename if desired. Now, the event for the button would look something like this: (Toggle Plain Text) private void btnSave1_Click(object sender, EventArgs e) { StreamWriter write1 = new StreamWriter ( "C:\\" + txtSaveName.Text ); write1.WriteLine(txtfield1.Text); write1.WriteLine(txtfield2.Text); write1.WriteLine(txtfield3.Text); write1.Close(); } private void btnSave1_Click(object sender, EventArgs e) { StreamWriter write1 = new StreamWriter ( "C:\\" + txtSaveName.Text ); write1.WriteLine(txtfield1.Text); write1.WriteLine(txtfield2.Text); write1.WriteLine(txtfield3.Text); write1.Close(); } Now let's say I want the program to autosave using a timer, can I do the following? (Toggle Plain Text) private void timer_Tick(object sender, EventArgs e) { DateTime autosave = DateTime.Today; if (txtSaveName.Visible == true) { StreamWriter write1 = new StreamWriter ("C:\\" + "Auto Saved" + txtSaveName.Text); write1.WriteLine(txtfield1.Text); write1.WriteLine(txtfield2.Text); write1.WriteLine(txtfield3.Text); write1.Close(); } } private void timer_Tick(object sender, EventArgs e) { DateTime autosave = DateTime.Today; if (txtSaveName.Visible == true) { StreamWriter write1 = new StreamWriter ("C:\\" + "Auto Saved" + txtSaveName.Text); write1.WriteLine(txtfield1.Text); write1.WriteLine(txtfield2.Text); write1.WriteLine(txtfield3.Text); write1.Close(); } } Or is there an easier way of calling the event for "btnSave"? My reason for asking is that I have about 90 or so fields that I am working with, so I would like to keep my code clean. I have tried something similar and it only saved when I minimized the application's window or when I exited, where I wanted it to save more often, but not sure how to activate the autosave function with the timer? Should I rather let it autosave for, when example, a field is being left, by implementing it's leave event? All help will be much appreciated. Thanks >BstrucT __________________ >BstrucT

Apr 17th, 2008, 8:16 AM	#2
lectricpharaoh Caffeinated Neural Net Join Date: Jun 2005 Location: Dry west coast of Canada Posts: 925 Rep Power: 4	Re: Autosaving Streams in C# First off, you can add all those textboxes to an array or other collection, such that you can iterate through them. This is very handy if you're performing identical operations on multiple textboxes, such as validation, serialization, etc. Stick it in the form's handler for the Load event, or something: C# Syntax (Toggle Plain Text) // textBoxArray is a class-scope object, so all methods can see it textBoxArray = new TextBox[NUMBER_OF_TEXTBOXES]; textBoxArray[0] = txtfield1; textBoxArray[1] = txtfield2; textBoxArray[2] = txtfield3; // and so on // textBoxArray is a class-scope object, so all methods can see it textBoxArray = new TextBox[NUMBER_OF_TEXTBOXES]; textBoxArray[0] = txtfield1; textBoxArray[1] = txtfield2; textBoxArray[2] = txtfield3; // and so on Then you can write a method that loops through all of these, and saves them: C# Syntax (Toggle Plain Text) private bool saveData(string filename) { try { StreamWriter sw = new StreamWriter(filename); for(int x=0; x<textBoxArray.Length; ++x) sw.WriteLine(textBoxArray[x]); } catch { return false; } finally { if(sw != null) sw.Close(); } return true; } private bool saveData(string filename) { try { StreamWriter sw = new StreamWriter(filename); for(int x=0; x<textBoxArray.Length; ++x) sw.WriteLine(textBoxArray[x]); } catch { return false; } finally { if(sw != null) sw.Close(); } return true; } Now, you can call this method from your timer function, your handler for the save button click, etc. It will let you know if it succeeds or not with the return value (true for success, false for failure). __________________ A man's knowledge is like an expanding sphere, the surface corresponding to the boundary between the known and the unknown. As the sphere grows, so does its surface; the more a man learns, the more he realizes how much he does not know. Hence, the most ignorant man thinks he knows it all. - L. Sprague de Camp

Apr 17th, 2008, 5:32 PM	#3
OpenLoop Expert Programmer Join Date: May 2005 Location: East Lansing, MI Posts: 663 Rep Power: 4	Re: Autosaving Streams in C# You can set the timer interval to say 120 seconds, and it will save every two minutes by calling timer_tick. Try this c# Syntax (Toggle Plain Text) Class asdjkfj { string autoSavePrefix = ""; ... private void btnSave1_Click(object sender, EventArgs e) { StreamWriter write1 = new StreamWriter ( "C:\\" + autoSavePrefix + txtSaveName.Text ); write1.WriteLine(txtfield1.Text); write1.WriteLine(txtfield2.Text); write1.WriteLine(txtfield3.Text); write1.Close(); } .... private void timer_Tick(object sender, EventArgs e) { DateTime autosave = DateTime.Today; if (txtSaveName.Visible == true) { autoSavePrefix = "Auto Saved"; btnSave1_Click(null, null); autoSavePrefix = ""; } } Class asdjkfj { string autoSavePrefix = ""; ... private void btnSave1_Click(object sender, EventArgs e) { StreamWriter write1 = new StreamWriter ( "C:\\" + autoSavePrefix + txtSaveName.Text ); write1.WriteLine(txtfield1.Text); write1.WriteLine(txtfield2.Text); write1.WriteLine(txtfield3.Text); write1.Close(); } .... private void timer_Tick(object sender, EventArgs e) { DateTime autosave = DateTime.Today; if (txtSaveName.Visible == true) { autoSavePrefix = "Auto Saved"; btnSave1_Click(null, null); autoSavePrefix = ""; } }

Apr 18th, 2008, 12:39 AM	#4
BstrucT Hobbyist Programmer Join Date: Dec 2007 Location: Durban, South-Africa Posts: 132 Rep Power: 1	Re: Autosaving Streams in C# Wow, thanks for the great advice guys. @lectricpharaoh: Thanks for showing me how to implement it by putting all those frisky fields into an array then just work with the array as a whole. This should make my life a lot easier regarding code repitition! @Openloop: Will definitely take a closer look at your timer function and see how I can implement it. Thanks for the great advice guys, gonna get cracking on the code right away! >BstrucT __________________ >BstrucT

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Programming Forums > Application Development > C#

Autosaving Streams in C#