Posted By

mmfusion on 07/01/10

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aspnet

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Last Edited at 07/01/10 12:15am

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ASP.NET Membership Provider - Remove Unwanted Profile Properties

/ Published in: C#

I removed several properties from my custom Profile class, and wanted to clean out the data from the aspnet\_Profile table. This code will remove all unwanted data from the PropertyNames and PropertyValuesString columns of aspnet\_Profile. Note this assumes PropertyValuesBinary is not used, though it wouldn't be hard to support that too.

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protected void fixProfile(aspnet_Profile p)
{
  string[] okfields = { "names", "of", "profile", "properties",
                        "you", "want", "to", "keep"};
 
  // search for: fieldname:S:startpos:length
  string regex = @"([a-zA-Z0-9]+):S:([0-9]+):([0-9]+):";
 
  string newNames = string.Empty;
  string newValues = string.Empty;
 
  int pos = 0;
  System.Text.RegularExpressions.Regex rgx 
    = new System.Text.RegularExpressions.Regex(regex);
  System.Text.RegularExpressions.Match match 
    = rgx.Match(p.PropertyNames, pos);
 
  while ( match != null && match.Success ) {
    string propertyName = match.Groups[1].Value;
    if (okfields.Contains(propertyName))
    {
      // We want to keep this profile property. Extract the 
      // value and then append to newNames/newValues
      int startPos = Convert.ToInt32(match.Groups[2].Value);
      int len = Convert.ToInt32(match.Groups[3].Value);
      string value = p.PropertyValuesString.Substring(startPos, len);
      newNames += string.Format(
        "{0}:S:{1}:{2}:",
        propertyName,
        newValues.Length,
        len);
      newValues += value;
    }
    pos = match.Index + match.Length;
    match = rgx.Match(p.PropertyNames, pos);
  }
 
  p.PropertyNames = newNames;
  p.PropertyValuesString = newValues;
 
}
 
protected void cleanMyData()
{
  // db is your DataContext
  foreach (var user in db.aspnet_Users)
  {
    aspnet_Profile p = user.aspnet_Profile;
    if (p == null) continue;
 
    fixProfile(p);
    db.SubmitChanges();
  }
}