Saving data to a file in C

Question

So i am currently working on a project to make an automated Character Sheet for the Pathfinder Roleplaying Game  and am at a loss as to how to save the data  I want to save the current value of all my variables to a file with the extension  pfcsheet and open it later  I ve googled around and can not find something that says how to do this  just how to save the contents of a text box  I tried using the saveFileDialog control but it keeps giving me a  file name is not valid  error and nobody seems to know why

User · Answer

Here s an article from MSDN on a guide for how to write text to a file   http   msdn microsoft com en-us library 8bh11f1k aspx  I d start there  then post additional  more specific questions as you continue your development

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Here is a simple example similar to Sachin s  It s recommended to use a  using  statement on the unmanaged file resource              using System IO          string filepath     C  test txt           using  StreamWriter writer   new StreamWriter filepath                         writer WriteLine  some text                using Statement  C  Reference

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Look into the XMLSerializer class   If you want to save the state of objects and be able to recreate them easily at another time  serialization is your best bet   Serialize it so you are returned the fully-formed XML  Write this to a file using the StreamWriter class   Later  you can read in the contents of your file  and pass it to the serializer class along with an instance of the object you want to populate  and the serializer will take care of deserializing as well   Here s a code snippet taken from Microsoft Support   using System   public class clsPerson     public  string FirstName    public  string MI    public  string LastName     class class1       static void Main string   args             clsPerson p new clsPerson          p FirstName    Jeff         p MI    A         p LastName    Price         System Xml Serialization XmlSerializer x   new System Xml Serialization XmlSerializer p GetType               at this step  instead of passing Console Out  you can pass in a           Streamwriter to write the contents to a file of your choosing        x Serialize Console Out  p           Console WriteLine          Console ReadLine

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Starting with the System IO namespace  particularly the File or FileInfo objects  should get you started   http   msdn microsoft com en-us library system io file aspx  http   msdn microsoft com en-us library system io fileinfo aspx

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One liner   System IO File WriteAllText   D  file txt   content     It creates the file if it doesn t exist and overwrites it if it exists  Make sure you have appropriate privileges to write to the location  otherwise you will get an exception   https   msdn microsoft com en-us library ms143375 28v vs 110 29 aspx f 255 amp MSPPError -2147217396  Write string to text file and ensure it always overwrites the existing content

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I just wrote a blog post on saving an object s data to Binary  XML  or Json  It sounds like you probably want to use Binary serialization  but perhaps you want the files to be edited outside of your app  in which case XML or Json might be better  Here are the functions to do it in the various formats  See my blog post for more details   Binary       lt summary gt      Writes the given object instance to a binary file       lt para gt Object type  and all child types  must be decorated with the  Serializable  attribute  lt  para gt       lt para gt To prevent a variable from being serialized  decorate it with the  NonSerialized  attribute  cannot be applied to properties  lt  para gt       lt  summary gt       lt typeparam name  T  gt The type of object being written to the XML file  lt  typeparam gt       lt param name  filePath  gt The file path to write the object instance to  lt  param gt       lt param name  objectToWrite  gt The object instance to write to the XML file  lt  param gt       lt param name  append  gt If false the file will be overwritten if it already exists  If true the contents will be appended to the file  lt  param gt  public static void WriteToBinaryFile lt T gt  string filePath  T objectToWrite  bool append   false        using  Stream stream   File Open filePath  append   FileMode Append   FileMode Create                 var binaryFormatter   new System Runtime Serialization Formatters Binary BinaryFormatter            binaryFormatter Serialize stream  objectToWrite                 lt summary gt      Reads an object instance from a binary file       lt  summary gt       lt typeparam name  T  gt The type of object to read from the XML  lt  typeparam gt       lt param name  filePath  gt The file path to read the object instance from  lt  param gt       lt returns gt Returns a new instance of the object read from the binary file  lt  returns gt  public static T ReadFromBinaryFile lt T gt  string filePath        using  Stream stream   File Open filePath  FileMode Open                 var binaryFormatter   new System Runtime Serialization Formatters Binary BinaryFormatter            return  T binaryFormatter Deserialize stream             XML  Requires the System Xml assembly to be included in your project        lt summary gt      Writes the given object instance to an XML file       lt para gt Only Public properties and variables will be written to the file  These can be any type though  even other classes  lt  para gt       lt para gt If there are public properties variables that you do not want written to the file  decorate them with the  XmlIgnore  attribute  lt  para gt       lt para gt Object type must have a parameterless constructor  lt  para gt       lt  summary gt       lt typeparam name  T  gt The type of object being written to the file  lt  typeparam gt       lt param name  filePath  gt The file path to write the object instance to  lt  param gt       lt param name  objectToWrite  gt The object instance to write to the file  lt  param gt       lt param name  append  gt If false the file will be overwritten if it already exists  If true the contents will be appended to the file  lt  param gt  public static void WriteToXmlFile lt T gt  string filePath  T objectToWrite  bool append   false  where T   new         TextWriter writer   null      try               var serializer   new XmlSerializer typeof T            writer   new StreamWriter filePath  append           serializer Serialize writer  objectToWrite             finally               if  writer    null              writer Close                  lt summary gt      Reads an object instance from an XML file       lt para gt Object type must have a parameterless constructor  lt  para gt       lt  summary gt       lt typeparam name  T  gt The type of object to read from the file  lt  typeparam gt       lt param name  filePath  gt The file path to read the object instance from  lt  param gt       lt returns gt Returns a new instance of the object read from the XML file  lt  returns gt  public static T ReadFromXmlFile lt T gt  string filePath  where T   new         TextReader reader   null      try               var serializer   new XmlSerializer typeof T            reader   new StreamReader filePath           return  T serializer Deserialize reader             finally               if  reader    null              reader Close              Json  You must include a reference to Newtonsoft Json assembly  which can be obtained from the Json NET NuGet Package        lt summary gt      Writes the given object instance to a Json file       lt para gt Object type must have a parameterless constructor  lt  para gt       lt para gt Only Public properties and variables will be written to the file  These can be any type though  even other classes  lt  para gt       lt para gt If there are public properties variables that you do not want written to the file  decorate them with the  JsonIgnore  attribute  lt  para gt       lt  summary gt       lt typeparam name  T  gt The type of object being written to the file  lt  typeparam gt       lt param name  filePath  gt The file path to write the object instance to  lt  param gt       lt param name  objectToWrite  gt The object instance to write to the file  lt  param gt       lt param name  append  gt If false the file will be overwritten if it already exists  If true the contents will be appended to the file  lt  param gt  public static void WriteToJsonFile lt T gt  string filePath  T objectToWrite  bool append   false  where T   new         TextWriter writer   null      try               var contentsToWriteToFile   JsonConvert SerializeObject objectToWrite           writer   new StreamWriter filePath  append           writer Write contentsToWriteToFile             finally               if  writer    null              writer Close                  lt summary gt      Reads an object instance from an Json file       lt para gt Object type must have a parameterless constructor  lt  para gt       lt  summary gt       lt typeparam name  T  gt The type of object to read from the file  lt  typeparam gt       lt param name  filePath  gt The file path to read the object instance from  lt  param gt       lt returns gt Returns a new instance of the object read from the Json file  lt  returns gt  public static T ReadFromJsonFile lt T gt  string filePath  where T   new         TextReader reader   null      try               reader   new StreamReader filePath           var fileContents   reader ReadToEnd            return JsonConvert DeserializeObject lt T gt  fileContents             finally               if  reader    null              reader Close              Example     To save the characterSheet variable contents to a file  WriteToBinaryFile lt CharacterSheet gt   C  CharacterSheet pfcsheet   characterSheet       To load the file contents back into a variable  CharacterSheet characterSheet   ReadFromBinaryFile lt CharacterSheet gt   C  CharacterSheet pfcsheet

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I think you might want something like this     Compose a string that consists of three lines  string lines    First line  r nSecond line  r nThird line        Write the string to a file  System IO StreamWriter file   new System IO StreamWriter  c   test txt    file WriteLine lines    file Close

[c#] Saving data to a file in C#

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