DataCommand.DeriveParameters Method

Article
02/28/2011

Derives the parameters that can be specified for a given command.

Namespace: Microsoft.VisualStudio.Data
Assembly: Microsoft.VisualStudio.Data (in Microsoft.VisualStudio.Data.dll)

Syntax

'Déclaration
Public Overridable Function DeriveParameters ( _
    command As String, _
    commandType As Integer, _
    commandTimeout As Integer _
) As DataParameter()

public virtual DataParameter[] DeriveParameters(
    string command,
    int commandType,
    int commandTimeout
)

public:
virtual array<DataParameter^>^ DeriveParameters(
    String^ command, 
    int commandType, 
    int commandTimeout
)

abstract DeriveParameters : 
        command:string * 
        commandType:int * 
        commandTimeout:int -> DataParameter[] 
override DeriveParameters : 
        command:string * 
        commandType:int * 
        commandTimeout:int -> DataParameter[]

public function DeriveParameters(
    command : String, 
    commandType : int, 
    commandTimeout : int
) : DataParameter[]

Parameters

command
Type: System.String
A command from which to derive parameters specific to a data source.

commandType
Type: System.Int32
The command type for the indicated command, specifying how to interpret the contents of the command parameter.

commandTimeout
Type: System.Int32
The length of time, in seconds, to block the client before canceling the parameter derivation and returning to the caller. A value of 0 indicates infinite timeout; a value of -1 indicates a provider default.

Return Value

Type: array<Microsoft.VisualStudio.Data.DataParameter[]
Returns an array of DataParameter objects. Each object represents a parameter derived from the command.

Exceptions

Exception	Condition
ArgumentNullException	The command or asyncCommandEvents are null.
ArgumentException	The commandType specifies an invalid type.
ArgumentOutOfRangeException	The commandTimeout is less than -1.
NotSupportedException	The provider does not support this method.

Remarks

Once the instances of the derived parameter objects are retrieved, the client owns them and can modify their values as needed; the client will then pass these values to an Execute

or ExecuteWithoutResults

call.

Notes

Other exceptions that occur indicate that the parameter derivation failed for a provider-specified reason.

.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.

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