C# Recommend way to Open and Close a file ONCE with multiple button actions

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In a C#, for you experts out there, what is the recommend way to write a FORM based Microsoft.Office.Interop.Powerpoint application so that a file is only opened ONCE. After this the user can perform multiple button_clicks to cause changes to be made to the file. Then finally the user saves and closes the file by another button_click. (ie multiple access to the open file, through multiple button_clicks).

All the examples online perform the entire process "Open>do stuff>Save", within a single method. This is what I commonly see:

C#

private void button1_Click(object sender, EventArgs e)
{
      Using (PresentationDocument mypptx = PresenationDocument.Open(Myfilename,true))
     {
        //do stuff
        //do stuff
        Mypptx.PresentationPart.Presentation.Save();
        Mypptx.Close();
     }
 }

In the above example you are forced to open and close the file within every "Public void Button#_Click(...) method?

Instead I am looking for something like this in Pseudo code:

C#

using System;
using SystemIO;
using System.Windows.Forms;
using DocumentFormat.OpenXml;
using DocumentFormat.Presentaton;
using Microsoft.Office.Interop.Powerpoint;
using Powerpoint = Microsoft.Office.Interop.Powerpoint;

namespace Test1
{
    public partial class Form1 : Form
    {
      //can not open the file here as the Form is not open and you want the user to select the file name from the OpenFileDialog after they click a button on the form

        public Form1()
        {
            InitializeComponent();          
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog1.ShowDialog();
            ...
            //Open the pptx file  
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //do stuff to the open pptx file
        }

        private void button3_Click(object sender, EventArgs e)
        {
            saveFileDialog1.ShowDialog();
            //Save the pptx file
            //close the pptx file
        }
    }
}

Posted 29-Jul-15 15:52pm

Member 11859273

Updated 29-Jul-15 16:24pm

PIEBALDconsult

v2

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PIEBALDconsult 29-Jul-15 22:25pm

You can, but it's not recommended. You'll need a field to hold a reference to the file.

2 solutions

Solution 2

Thanks guys! I realize I will need to code around the conflicting logic issues, but this gets me started.

Posted 30-Jul-15 15:40pm

Member 11859273

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himanshu agarwal · Accepted Answer · 2015-07-29T17:45:00

Instead of

C#

Using (PresentationDocument mypptx = PresenationDocument.Open(Myfilename,true))
{
    //do stuff
    //do stuff
    Mypptx.PresentationPart.Presentation.Save();
    Mypptx.Close();
}

Do something like this, as PIEBALDconsultant suggested.

C#

using System;
using SystemIO;
using System.Windows.Forms;
using DocumentFormat.OpenXml;
using DocumentFormat.Presentaton;
using Microsoft.Office.Interop.Powerpoint;
using Powerpoint = Microsoft.Office.Interop.Powerpoint;

namespace Test1
{
    public partial class Form1 : Form
    {
        private PresentationDocument mypptx;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog1.ShowDialog();
            ...
            //Open the pptx file
            this.mypptx = PresenationDocument.Open(Myfilename,true);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if(null != this.mypptx)
            {
                //do stuff to the open pptx file
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            saveFileDialog1.ShowDialog();
            //Save the pptx file
            //close the pptx file
            if(null != this.mypptx)
            {
                this.mypptx.PresentationPart.Presentation.Save();
                this.mypptx.Close();
            }
        }
    }
}