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'System.Data.DataSet' does not contain a definition for 'Any'

Posted on 2010-09-19
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Last Modified: 2012-05-10
protected bool DataSourceIsEmpty(DataSet DataSource)
        {
            return DataSource == null || !DataSource.Any();
        }

Error      8      'System.Data.DataSet' does not contain a definition for 'Any' and no extension method 'Any' accepting a first argument of type 'System.Data.DataSet' could be found (are you missing a using directive or an assembly reference?)      C:\inetpub\wwwroot\OmegaLove.Web\OmegaLove.Web\Controls\UniGrid.ascx.cs      639      54      OmegaLove.Web
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Question by:omegalove
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8 Comments
 
LVL 29

Accepted Solution

by:
Göran Andersson earned 500 total points
ID: 33713326
A DataSet is not a single collection, it can contain several DataTables.

If you want to check if it contains no tables:

    DataSource.Tables.Count == 0

If you want to check that it contains one table, and that table is empty:

    DateSource.Tables.Count == 1 && DataSource.Tables[0].Rows.Count == 0
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Author Comment

by:omegalove
ID: 33713359
I want to create a method to check if a datasource is empty.
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LVL 29

Assisted Solution

by:Göran Andersson
Göran Andersson earned 500 total points
ID: 33713531
Then you first have to define what you mean by empty in this case.

A DataSet can for example contain several tables, but all the tables are empty. Should the DataSet be considered to be empty or not?
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Author Comment

by:omegalove
ID: 33713566
Nothing null empty no rows.
0
 
LVL 29

Assisted Solution

by:Göran Andersson
Göran Andersson earned 500 total points
ID: 33715301
A DataSet never contains any rows. It can only contain DataTables, which in turn can contain rows. So, you have to decide what it means when a DataSet is empty.

- Does it mean that it doesn't contain any tables?
- Does it mean that it contains one table, but that table is empty?
- Does it mean that it can contain several tables, but all tables are empty?
0
 

Author Comment

by:omegalove
ID: 33721443
       // Summary:
        //     Returns true if the given datasource is empty
        //
        // Parameters:
        //   dataSource:
        //     Datasource to check for emptyness
        public static bool DataSourceIsEmpty(object dataSource);

Not row count should = 0
what else?
0
 
LVL 29

Assisted Solution

by:Göran Andersson
Göran Andersson earned 500 total points
ID: 33724781
If you want to accept Object as a data source, you first have to check it's type against types that you accept, and handle each type separately.

Something like:

public static bool DataSourceIsEmpty(object dataSource) {
  if (dataSource is IListSource) {
    IListSource source = dataSource as IListSource;
    if (source.ContainsListCollection) {
      return source.GetList().Count == 0;
    }
  }
  if (dataSource is IList) {
    return (dataSource as IList).Count == 0;
  }
  if (dataSource is ...) {
    ...
  }
  return true; // unknown types are considered empty sources
}

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Author Closing Comment

by:omegalove
ID: 33762957
thanks.
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