共用方式為

SqlCeResultSet.IsDBNull Method

  • 發行項

Determines if the field at the specified ordinal position is null.

Namespace: System.Data.SqlServerCe
Assembly: System.Data.SqlServerCe (in system.data.sqlserverce.dll)

Syntax

'Declaration
Public Overrides Function IsDBNull ( _
    ordinal As Integer _
) As Boolean
'Usage
Dim instance As SqlCeResultSet
Dim ordinal As Integer
Dim returnValue As Boolean

returnValue = instance.IsDBNull(ordinal)

public override bool IsDBNull (
    int ordinal
)

public:
virtual bool IsDBNull (
    int ordinal
) override

public boolean IsDBNull (
    int ordinal
)

public override function IsDBNull (
    ordinal : int
) : boolean

Not applicable.

Parameters

  • ordinal
    The ordinal position of the column from which to retrieve the value.

Return Value

True if the specified field is null; otherwise, false.

Remarks

Returns true only if the corresponding value is equivalent to DBNull or if the object implements IsNullable and IsNull returns true.

Returns false in any other case, including null references and empty strings.

An IndexOutOfRangeException is thrown if no field exists at the specified index.

Platforms

Windows CE, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows XP Professional x64 Edition, Windows XP SP2

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

Version Information

.NET Framework

Supported in: 3.0

.NET Compact Framework

Supported in: 2.0

See Also

Reference

SqlCeResultSet Class
SqlCeResultSet Members
System.Data.SqlServerCe Namespace