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DataReader to Dataset...?

Hi.
I need to read data from a database on page load, then keep results in memory so to work "offline" and browse through records.

I do need a DataSet, right? If so, how do I fill a DataSet from a DataReader?
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ziggie301
Asked:
ziggie301
3 Solutions
 
rpkhareCommented:
I am not following what you are saying. You will a DataSet through Data Adapter. What you are trying to achieve? If you want to simply fill the DataSet, it can easily be done by passing SQL Query to Data Adapter.
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silemoneCommented:
Just plug this code in and pass your DataReader object...

DataSet yourset = DataReaderToDataSet(YourDataReader);

and here's the method:

static DataSet DataReaderToDataSet(IDataReader reader)
{
DataTable table = new DataTable();
int fieldCount = reader.FieldCount;
for (int i = 0; i < fieldCount; i++)
{
table.Columns.Add(reader.GetName(i), reader.GetFieldType(i));
}
table.BeginLoadData();
object[] values = new object[fieldCount];
while (reader.Read())
{
reader.GetValues(values);
table.LoadDataRow(values, true);
}
table.EndLoadData();
DataSet ds = new DataSet();
ds.Tables.Add(table);
return ds;
}

with DataAdapter:



SqlDataReader dr = cmd.ExecuteReader();
DataSet ds = new DataSet();
DataSet dt = new DataTable();
DataReaderAdapter da = new DataReaderAdapter();
da.FillFromReader(dt, dr);
ds.Tables.Add(dt)
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silemoneCommented:
By the way, IDataReader is used because it's just the interface that a DataReader must implement and therefore a DataReader is considered a IDataReader (i.e. it's considered a child class that's inheriting methods), so just pass a normal DataReader and it will work...
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TechTiger007Commented:
Why do you need to get a datareader first and convert it into dataset?
Why dont you directly fill data into dataset.

Here is a sample
http://www.windowsitlibrary.com/Content/1205/06/2.html
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silemoneCommented:
I agree Tech, to a point so i gave him both ways because I thought similarly to let him see how small the code would be using a data adapter, however, the method for converting datareader to dataset is already written so he would only have one line of code to write that...Code for DataAdapter the code at the bottom of my post, but maybe he has a DataReader already and doesn't feel comfortable changing code around a  lot, so i took that into consideration since that's what he asked for and also gave him that code.  Also, this code is all over the web, so it appears many people convert DataReaders to Datasets.
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ziggie301Author Commented:
I just could'nt immagine how to fill a dataset. Now I do. :) Thank you
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