AdoDotNetDataReader.IsNullItem Method
Indicates whether the data item at the specified index is unspecified, that is, nulla null reference (Nothing in Visual Basic).
Namespace: Microsoft.VisualStudio.Data.AdoDotNet
Assembly: Microsoft.VisualStudio.Data (in Microsoft.VisualStudio.Data.dll)
Syntax
'Declaration
Public Overrides Function IsNullItem ( _
index As Integer _
) As Boolean
public override bool IsNullItem(
int index
)
public:
virtual bool IsNullItem(
int index
) override
abstract IsNullItem :
index:int -> bool
override IsNullItem :
index:int -> bool
public override function IsNullItem(
index : int
) : boolean
Parameters
index
Type: System.Int32Index of the data item to examine.
Return Value
Type: System.Boolean
Returns true if the item is nulla null reference (Nothing in Visual Basic), that is, unspecified; otherwise returns false.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | The index parameter is invalid. |
Remarks
Calling this method to figure out if a value is nulla null reference (Nothing in Visual Basic) performs better than retrieving the value to see if it is equal to Value, because if it is not nulla null reference (Nothing in Visual Basic) this causes the entire value to be read from the reader.
.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.