CODEWITHSUNDEEP
c#.netfilestreamreader
Sowvik Roy
Sowvik Roy

Reputation: 913

How to read and write a list object into a file

I had written a list object to a file like this

 private List<string> _cacheFileList=new List<string>(4);
_cacheFileList.Add("Something");
    using (StreamWriter file = new StreamWriter(@"cache.bin")) 
                {
                    file.Write(_cacheFileList);
                }

Now how could I retrieve whole list object??

Upvotes: 0

Views: 87

Answers (3)

akmed0zmey
akmed0zmey

Reputation: 573

If you want just write your list line by line then you can modify your code like this:

var cacheFileList = new List<string>(4);
cacheFileList.Add("Something");

using (var file = new StreamWriter(@"cache.bin"))
{
    file.Write(string.Join("\r\n", cacheFileList));
}

Upvotes: 0

ProgrammingLlama
ProgrammingLlama

Reputation: 38767

If you just want a text file with a single line per list entry, you could try the code below. Of course, you would need error handling and need to ensure that the strings in the list did not contain newlines.

// Write
List<string> _listA = new List<string>(4);
_listA.Add("Test");
_listA.Add("Test2");
_listA.Add("Test3");
_listA.Add("Test4");
System.IO.File.WriteAllLines("test.txt", _listA);

// Read
List<string> _listB = new List<string>(4);
_listB.AddRange(System.IO.File.ReadAllLines("test.txt"));

Upvotes: 2

Selman Gen&#231;
Selman Gen&#231;

Reputation: 101681

Instead of using StreamWriter like that, use BinaryFormatter to serialize your list. Then you can easily retrieve your list back by deserializing. MSDN has a good example about how to do that.

Upvotes: 4

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