Question

I’m a real noob to C# trying to write a small XML replacer program based on a short code a friend of mine used in one of his apps..

I’m having trouble with this line:

StreamReader sr = new StreamReader(textBox1.Text);

I get an error: “Empty path name is not legal.”
why doesn’t this work?

the code is:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace ReplaceMe
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        StreamReader sr = new StreamReader(textBox1.Text);
        StreamWriter sw = new StreamWriter(textBox1.Text.Replace(".", "_new."));
        string cur = "";
        do
        {
            cur = sr.ReadLine();
            cur = cur.Replace(textBox2.Text, textBox3.Text);
            sw.WriteLine(cur);
        }
        while (!sr.EndOfStream);

        sw.Close();
        sr.Close();

        MessageBox.Show("Finished, the new file is in the same directory as the old one");
    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {

    }


    private void button1_Click(object sender, EventArgs e)
    {
        if (openFileDialog1.ShowDialog() == DialogResult.OK)
        {
            this.textBox1.Text = openFileDialog1.FileName;
        }

    }


}
}

Thanks in advance 🙂

Answer 1

You should make sure the file exists before you try to access it, it seems you deliver an empty string as a filename.

try accessing the file only when:

if (File.Exists(textBox1.Text))
{
  //Your Code...
}