Indicates whether the data item at the specified index is unspecified, that is, nulla null reference (Nothing in Visual Basic).
Namespace: Microsoft.VisualStudio.Data.Framework
Assembly: Microsoft.VisualStudio.Data.Framework (in Microsoft.VisualStudio.Data.Framework.dll)
Syntax
'Declaration
Public MustOverride Function IsNullItem ( _
index As Integer _
) As Boolean
'Usage
Dim instance As DataReader
Dim index As Integer
Dim returnValue As Boolean
returnValue = instance.IsNullItem(index)
public abstract bool IsNullItem(
int index
)
public:
virtual bool IsNullItem(
int index
) abstract
public abstract function IsNullItem(
index : int
) : boolean
Parameters
index
Type: System.Int32Index of the data item to examine.
Return Value
Type: System.Boolean
true if the item is nulla null reference (Nothing in Visual Basic), that is, unspecified; otherwise, false.
Implements
IVsDataReader.IsNullItem(Int32)
Remarks
Calling this method to figure out whether a value is nulla null reference (Nothing in Visual Basic) provides better performance than retrieving the value to see whether it is equal to Value, because the latter causes the entire value to be read from the data reader instance.
Notes to Inheritors:
The derived class must override this method.
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.