C DataRow Empty-check

Question

I got this    DataTable dtEntity   CreateDataTable     drEntity   dtEntity NewRow      Then I add data to the row  or not   Lots of code  really don t know if there s anything inside the row  Depends on the input  i am importing from some files   I d like to do something like    if  drEntity s EVERY CELL IS NOT EMPTY        dtEntity Rows Add drEntity       else         don t add  will create a new one  drEntity   dtEntity NewRow          Is there some nice way to check if the DataRow s every cell is empty  Or I should foreach  and check them one by one

User · Answer

I did it like this   var listOfRows   new List lt DataRow gt     foreach  var row in resultTable Rows Cast lt DataRow gt           var isEmpty   row ItemArray All x   gt  x    null     x   null  amp  amp  string IsNullOrWhiteSpace x ToString           if   isEmpty                listOfRows Add row

User · Answer

I created an extension method  gosh I wish Java had these  called IsEmpty as follows   public static bool IsEmpty this DataRow row        return row    null    row ItemArray All i   gt  i is DBNull       The other answers here are correct  I just felt mine lent brevity in its succinct use of Linq to Objects  BTW  this is really useful in conjunction with Excel parsing since users may tack on a row down the page  thousands of lines  with no regard to how that affects parsing the data   In the same class  I put any other helpers I found useful  like parsers so that if the field contains text that you know should be a number  you can parse it fluently  Minor pro tip for anyone new to the idea   Anyone at SO  really  Nah    With that in mind  here is an enhanced version   public static bool IsEmpty this DataRow row        return row    null    row ItemArray All i   gt  i IsNullEquivalent        public static bool IsNullEquivalent this object value        return value    null               value is DBNull               string IsNullOrWhiteSpace value ToString         Now you have another useful helper  IsNullEquivalent which can be used in this context and any other  too  You could extend this to include things like  n a  or  TBD  if you know that your data has placeholders like that

User · Answer

I know this has been answered already and it s an old question  but here s an extension method to do the same   public static class DataExtensions       public static bool AreAllCellsEmpty this DataRow row                var itemArray   row ItemArray          if itemArray  null              return true          return itemArray All x   gt  string IsNullOrWhiteSpace x ToString                            And you use it like so   if  dr AreAllCellsEmpty       etc

User · Answer

public static bool AreAllCellsEmpty DataRow row      if  row    null  throw new ArgumentNullException  row       for  int i   row Table Columns Count - 1  i  gt   0  i--      if   row IsNull i         return false     return true

User · Answer

To delete null and also empty entries Try this    foreach  var column in drEntitity Columns Cast lt DataColumn gt    ToArray                                  if  drEntitity AsEnumerable   All dr   gt  dr IsNull column    string IsNullOrEmpty  dr column  ToString                          drEntitity Columns Remove column

User · Answer

You could use this   if drEntity ItemArray Where c   gt  IsNotEmpty c   ToArray   Length    0           Row is empty     IsNotEmpty cell  would be your own implementation  checking whether the data is null or empty  based on what type of data is in the cell  If it s a simple string  it could end up looking something like this   if drEntity ItemArray Where c   gt  c    null  amp  amp   c Equals      ToArray   Length    0           Row is empty   else          Row is not empty     Still  it essentially checks each cell for emptiness  and lets you know whether all cells in the row are empty

User · Answer

I prefer approach of Tommy Carlier  but with a little change   foreach  DataColumn column in row Table Columns      if   row IsNull column         return false     return true    I suppose this approach looks more simple and bright

User · Answer

DataTable NewRow will initialize each field to    the default value for each DataColumn  DataColumn DefaultValue  except for auto-increment columns  DataColumn AutoIncrement    true   which will be initialized to the next auto-increment value  and expression columns  DataColumn Expression Length  gt  0  are also a special case  the default value will depend on the default values of columns on which the expression is calculated    So you should probably be checking something like   bool isDirty   false  for  int i 0  i lt table Columns Count  i          if  table Columns i  Expression Length  gt  0  continue      if  table Columns i  AutoIncrement  continue      if  row i     table Columns i  DefaultValue  isDirty   true      I ll leave the LINQ version as an exercise

User · Answer

A simple method along the lines of   bool AreAllColumnsEmpty DataRow dr     if  dr    null       return true      else      foreach var value in dr ItemArray          if  value    null              return false              return true         Should give you what you re after  and to make it  nice   as there s nothing as far as I m aware  in the Framework   you could wrap it up as an extension method  and then your resultant code would be   if  datarow AreAllColumnsEmpty        else

User · Answer

Maybe a better solution would be to add an extra column that is automatically set to 1 on each row  As soon as there is an element that is not null change it to a 0   then   If drEntitity rows i  coulmn 8    1       dtEntity Rows Add drEntity      else         don t add  will create a new one  drEntity   dtEntity NewRow

User · Answer

AFAIK  there is no method that does this in the framework   Even if there was support for something like this in the framework  it would essentially be doing the same thing   And that would be looking at each cell in the DataRow to see if it is empty

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