This will add the line where you want it. (Make sure you have using System.IO; and using System.Linq; added) public void CreateEntry(string npcName) //npcName = “item1” { var fileName = “test.txt”; var endTag = String.Format(“[/{0}]”, npcName); var lineToAdd = “//Add a line here in between the specific boundaries”; var txtLines = File.ReadAllLines(fileName).ToList(); //Fill a list … Read more
protected void TestSubmit_ServerClick(object sender, EventArgs e) { using (StreamWriter _testData = new StreamWriter(Server.MapPath(“~/data.txt”), true)) { _testData.WriteLine(TextBox1.Text); // Write the file. } } Server.MapPath takes a virtual path and returns an absolute one. “~” is used to resolve to the application root.
This is because the StreamReader closes the underlying stream automatically when being disposed of. The using statement does this automatically. However, the StreamWriter you’re using is still trying to work on the stream (also, the using statement for the writer is now trying to dispose of the StreamWriter, which is then trying to close the … Read more
LINQ FTW! var sb = new StringBuilder(); var headers = dataGridView1.Columns.Cast<DataGridViewColumn>(); sb.AppendLine(string.Join(“,”, headers.Select(column => “\”” + column.HeaderText + “\””).ToArray())); foreach (DataGridViewRow row in dataGridView1.Rows) { var cells = row.Cells.Cast<DataGridViewCell>(); sb.AppendLine(string.Join(“,”, cells.Select(cell => “\”” + cell.Value + “\””).ToArray())); } And indeed, c.Value.ToString() will throw on null value, while c.Value will correctly convert to an empty string.
Ok, two edits later… This should work. The first time I tried it I think I had forgotten to set FileMode.Append on the oStream. string test = “foo.txt”; var oStream = new FileStream(test, FileMode.Append, FileAccess.Write, FileShare.Read); var iStream = new FileStream(test, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); var sw = new System.IO.StreamWriter(oStream); var sr = new System.IO.StreamReader(iStream); var … Read more
A quick jump into Reflector.NET shows that the Close() method on StreamWriter is: public override void Close() { this.Dispose(true); GC.SuppressFinalize(this); } And StreamReader is: public override void Close() { this.Dispose(true); } The Dispose(bool disposing) override in StreamReader is: protected override void Dispose(bool disposing) { try { if ((this.Closable && disposing) && (this.stream != null)) { … Read more
Use this instead: new StreamWriter(“c:\\file.txt”, true); With this overload of the StreamWriter constructor you choose if you append the file, or overwrite it. C# 4 and above offers the following syntax, which some find more readable: new StreamWriter(“c:\\file.txt”, append: true);