SVC Service Error regarding Deserializing

Question

4.00/5 (1 vote)

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Hi,

I am trying to get the list of sub-directories of a directory from svc service, but it shows an error --

The type System.IO.FileSystemInfo cannot be deserialized as it doesn't has parameter less public constructor.

Please help me out from this situation.

Code Snippet--

[OperationContract]
private System.Collections.Generic.List<DirectoryInfo> GetSubDirectories(string directoryPath)
{
    try
    {
        DirectoryInfo dir = new DirectoryInfo(directoryPath);
        DirectoryInfo[] dirs = dir.GetDirectories();
        System.Collections.Generic.List<DirectoryInfo> childs = new System.Collections.Generic.List<DirectoryInfo>();
        foreach (DirectoryInfo dir1 in dirs)
        {
           // XmlObjectSerializer xml_serial = new XmlObjectSerializer(typeof(XML_directory));
            childs.Add(dir1);
        }

        return childs;
    }
    catch (Exception) { return null; }
    //return null;
}

Posted 8-Mar-13 5:28am

Ariana Bond

Updated 8-Mar-13 6:14am

Richard C Bishop

v4

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sjelen 8-Mar-13 12:11pm

Improve your question with some relevant code, so we can see what you are trying to do.

1 solution

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Motamas · Accepted Answer · 2013-03-12T04:46:00

My first suggestion would have been to try to create an inherited object from the directoryinfo class. But it is sealed. Anyway I would not recomend to you to return with a list of DirectoryInfo. I would create a DTO (Data Transfer Object). See the following:

The DTO:

C#

[DataContract]
public Class DirectoryInfoDTO
{
  [DataMember]
  public DateTime CreationTime {get ; set;}
  
  [DataMember]
  public string Name {get ; set;}

}

And then the code: // Include: System.Linq;

C#

var result = dirs.Select((a,b) => new DirectoryInfoDTO()
                  {  
                      Name = a.FullName,
                      CreationTime = a.CreationTime
                  }

the result will be a collection of DirectoryInfoDTO