DataCommand.Execute Method (String, DataCommandType, [], Int32)

Executes a specified command, optionally with parameters, and returns read-only results.

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

Syntax

'宣言
Public Overridable Function Execute ( _
    command As String, _
    commandType As DataCommandType, _
    parameters As IVsDataParameter(), _
    commandTimeout As Integer _
) As IVsDataReader
'使用
Dim instance As DataCommand
Dim command As String
Dim commandType As DataCommandType
Dim parameters As IVsDataParameter()
Dim commandTimeout As Integer
Dim returnValue As IVsDataReader

returnValue = instance.Execute(command, _
    commandType, parameters, commandTimeout)

public virtual IVsDataReader Execute(
    string command,
    DataCommandType commandType,
    IVsDataParameter[] parameters,
    int commandTimeout
)

public:
virtual IVsDataReader^ Execute(
    String^ command, 
    DataCommandType commandType, 
    array<IVsDataParameter^>^ parameters, 
    int commandTimeout
)

public function Execute(
    command : String, 
    commandType : DataCommandType, 
    parameters : IVsDataParameter[], 
    commandTimeout : int
) : IVsDataReader

Parameters

command
Type: System.String

A command to execute that is specific to a data source.

commandType
Type: Microsoft.VisualStudio.Data.Services.SupportEntities.DataCommandType

The type of the command that specifies how to interpret the contents of the command parameter. The command type could either be a value from the DataCommandType enumeration or a custom command type defined by a provider, which can be passed in by forcing a cast from an integer to the DataCommandType enumeration.

parameters
Type: []

An array of IVsDataParameter objects representing the command parameters for the specified command type.

commandTimeout
Type: System.Int32

The length of time, in seconds, to block the client before canceling the execution and returning to the caller. A value of 0 indicates infinite time-out; a value of -1 indicates a provider default.

Return Value

Type: Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataReader

An IVsDataReader object, which provides a forward-only, read-only stream from the data source.

Implements

IVsDataCommand.Execute(String, DataCommandType, [], Int32)

Exceptions

Exception	Condition
ArgumentNullException	The command parameter is a null reference (Nothing in Visual Basic).
ArgumentOutOfRangeException	The commandTimeout parameter is less than -1.

Remarks

Any out or return value parameters specified in the parameters array of DataParameter objects can be retrieved only after the returned IVsDataReader has been closed. This is because of varying orders in which data and parameter values can be returned by a data source.

注意

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

Permissions

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.