Using BinaryWriter/BinaryReader with a dictionary

Question

How do I use a BinaryReader and a BinaryWriter with a Dictionary<string, double>?
I've tried to do it recursively, but still no luck.

Anyone know how to do this?

Answer 1

Is it what you're looking for?

            Dictionary<string, double> data = new Dictionary<string, double>()
                                                  {
                                                      {"1", 123},
                                                      {"2", 1234},
                                                      {"123123123", 12345}
                                                  };

            string fileName = @"c:\tmp\test.data";
            using (BinaryWriter binaryWriter = new BinaryWriter(File.Open(fileName, FileMode.Create)))
            {
                foreach (var x in data)
                {
                    binaryWriter.Write(x.Key);
                    binaryWriter.Write(x.Value);
                }
            }

            data.Clear();

            using (BinaryReader binaryReader = new BinaryReader(File.Open(fileName, FileMode.Open)))
            {
                while (true)
                {
                    var k = binaryReader.ReadString();
                    var v = binaryReader.ReadDouble();

                    data.Add(k, v);

                    if (binaryReader.BaseStream.Position == binaryReader.BaseStream.Length)
                        break;
                }
            }

            Debug.Assert(data.Keys.Count == 3);
            Debug.Assert(data["1"] == 123);
            Debug.Assert(data["2"] == 1234);
            Debug.Assert(data["123123123"] == 12345);