DbCommand.ExecuteScalar Method
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Executes the command and returns the first column of the first row in the first returned result set. All other columns, rows and result sets are ignored.
public:
abstract System::Object ^ ExecuteScalar();public abstract object ExecuteScalar();public abstract object? ExecuteScalar();abstract member ExecuteScalar : unit -> objPublic MustOverride Function ExecuteScalar () As ObjectThe first column of the first row in the first result set.
Use the ExecuteScalar method to retrieve a single value (for example, an aggregate value) from a database. This requires less code than using the ExecuteReader method and performing the operations necessary to generate the single value using the data returned by a DbDataReader.
If the first column of the first row in the result set is not found, a null reference (Nothing in Visual Basic) is returned. If the value in the database is null, the query returns DBNull.Value.
| Product | Versions |
|---|---|
| .NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10 |
| .NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 2.0, 2.1 |
| UWP | 10.0 |
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