As Jared says, You cannot do this unless the other entity which has the file open allows for shared reads. Excel allows shared reads, even for files it has open for writing. Therefore, you must open the filestream with the FileShare.ReadWrite parameter. The FileShare param is often misunderstood. It indicates what other openers of the … Read more
Read all file content. Make a replacement with String.Replace. Write content back to file. string text = File.ReadAllText(“test.txt”); text = text.Replace(“some text”, “new value”); File.WriteAllText(“test.txt”, text);
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
If you are using .NET 4.0, try MemoryMappedFile which is a designed class for this scenario. You can use StreamReader.ReadLine otherwise.
Yes, StreamReader, StreamWriter, BinaryReader and BinaryWriter all close/dispose their underlying streams when you call Dispose on them. They don’t dispose of the stream if the reader/writer is just garbage collected though – you should always dispose of the reader/writer, preferrably with a using statement. (In fact, none of these classes have finalizers, nor should they … Read more
You can improve read speed by using a BufferedStream, like this: using (FileStream fs = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) using (BufferedStream bs = new BufferedStream(fs)) using (StreamReader sr = new StreamReader(bs)) { string line; while ((line = sr.ReadLine()) != null) { } } March 2013 UPDATE I recently wrote code for reading and processing (searching … Read more
The leak is here: new XmlSerializer(typeof(XMLObj), new XmlRootAttribute(“rootNode”)) XmlSerializer uses assembly generation, and assemblies cannot be collected. It does some automatic cache/reuse for the simplest constructor scenarios (new XmlSerializer(Type), etc), but not for this scenario. Consequently, you should cache it manually: static readonly XmlSerializer mySerializer = new XmlSerializer(typeof(XMLObj), new XmlRootAttribute(“rootNode”)) and use the cached serializer … Read more
You can use the Assembly.GetManifestResourceStream Method: Add the following usings using System.IO; using System.Reflection; Set property of relevant file: Parameter Build Action with value Embedded Resource Use the following code var assembly = Assembly.GetExecutingAssembly(); var resourceName = “MyCompany.MyProduct.MyFile.txt”; using (Stream stream = assembly.GetManifestResourceStream(resourceName)) using (StreamReader reader = new StreamReader(stream)) { string result = reader.ReadToEnd(); } … Read more
Use: myString = String.Join(Environment.NewLine, myString.Split(new[] { ‘ ‘ }, StringSplitOptions.RemoveEmptyEntries)); This will split the string based on space and then join them using Environment.NewLine. So in case of multiple spaces only one new line will appear.