SqlDataReader - How to convert the current row to a dictionary

问题

Is there an easy way to convert all the columns of the current row of a SqlDataReader to a dictionary?

using (SqlDataReader opReader = command.ExecuteReader())
{
// Convert the current row to a dictionary
}

Thanks

回答1:

You can use LINQ:

return Enumerable.Range(0, reader.FieldCount)
                 .ToDictionary(reader.GetName, reader.GetValue);

回答2:

Easier than this?:

// Need to read the row in, usually in a while ( opReader.Read ) {} loop...
opReader.Read();

// Convert current row into a dictionary
Dictionary<string, object> dict = new Dictionary<string, object>();
for( int lp = 0 ; lp < opReader.FieldCount ; lp++ ) {
    dict.Add(opReader.GetName(lp), opReader.GetValue(lp));
}

I'm still not sure why you would need this particular transformation from one type of collection to another.

回答3:

I came across this question on 3/9/2016 and ended up using the answer provided by SLaks. However, I needed to slightly modify it to:

dataRowDictionary = Enumerable.Range(0, reader.FieldCount).ToDictionary(i => reader.GetName(i), i=> reader.GetValue(i).ToString());

I found guidance from this StackOverflow question: convert dataReader to Dictionary

回答4:

It's already an IDataRecord.

That should give you just about the same access (by key) as a dictionary. Since rows don't typically have more than a few handfuls of columns, the performance of the lookups shouldn't be that different. The only important difference is the type of the "payload", and even there your dictionary would have to use object for the value type, so I give the edge to IDataRecord.

回答5:

GetValues method accepts & puts in, all the values in a 1D array.
Does that help?

来源：https://stackoverflow.com/questions/912948/sqldatareader-how-to-convert-the-current-row-to-a-dictionary

标签

sql-server

linq

sqldatareader