有关反序列化的SVC服务错误 [英] SVC Service Error regarding Deserializing

问题描述

我试图从svc服务获取目录的子目录列表，但它显示错误 -



类型System.IO.FileSystemInfo无法反序列化，因为它没有参数少的公共构造函数。



请帮助我解决这种情况。



代码片段 -

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;
}

推荐答案

我的第一个建议是尝试从directoryinfo类创建一个继承的对象。但它是密封的。无论如何，我不会建议你返回DirectoryInfo列表。我会创建一个DTO（数据传输对象）。请参阅以下内容：



DTO：

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:

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

}

< u>然后是代码： // 包括：System.Linq;

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

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

结果将是DirectoryInfoDTO的集合

the result will be a collection of DirectoryInfoDTO

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