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Custom selection from dataset

Posted on 2004-08-06
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Last Modified: 2010-04-15
Hi Experts,

I generate a dataset with 3 column: PathId, ParentPathId, Path.

Example:
PathId                            ParentPathId                      Path
1                                   null                                    path1
2                                   1                                       path2
3                                   2                                       path3
4                                   2                                       path4
5                                   null                                    path5
6                                   5                                       path6

What I want to get is those paths:
path1
path1/path2
path1/path2/path3
path1/path2/path4
path5
path5/path6

Thanks in advance to help me to retrieve those paths.
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Question by:noulouk
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3 Comments
 
LVL 37

Accepted Solution

by:
gregoryyoung earned 500 total points
ID: 11740722
you are going to need to make a recursive function in order to get that, no compiler in front of me but this should be close.

public string GetPath(int ParentId) {
    DataView dv = new DataView(ds.Tables["whatever"]);
    dv.RowFilter = "PathId = " + ParentId;
    if(dv.Rows.Count == 1) {
          return dv.Rows[0].Item["Path"].ToString() + "/" + GetPath(dv.Rows[0].Item["PathId"];
    } else if(dv.Rows.Count > 1) {
          throw new System.Exception("More than one child directory found for " + ParentId);
    }
}

then to build all ...

public StringCollection GetAllPaths() {
      StringCollection sc = new StringCollection();
      DataView dv =  new DataView(ds.Tables["whatever"]);
      dv.RowFilter = "ParentPathId = null";
      foreach(DataRowView dr in dv.Rows) {
             sc.Add(GetPath((int) dr["PathId"]));
      }
}
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