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DataAsyncCommand.OnDeriveSchema Method

Dispatches the asynchronous derive schema operation to the synchronous DeriveSchema method call.

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

Syntax

'Declaration
Protected Overridable Function OnDeriveSchema ( _
    command As String, _
    commandType As DataCommandType, _
    parameters As IVsDataParameter(), _
    commandTimeout As Integer _
) As IVsDataReader
protected virtual IVsDataReader OnDeriveSchema(
    string command,
    DataCommandType commandType,
    IVsDataParameter[] parameters,
    int commandTimeout
)
protected:
virtual IVsDataReader^ OnDeriveSchema(
    String^ command, 
    DataCommandType commandType, 
    array<IVsDataParameter^>^ parameters, 
    int commandTimeout
)
abstract OnDeriveSchema : 
        command:string * 
        commandType:DataCommandType * 
        parameters:IVsDataParameter[] * 
        commandTimeout:int -> IVsDataReader  
override OnDeriveSchema : 
        command:string * 
        commandType:DataCommandType * 
        parameters:IVsDataParameter[] * 
        commandTimeout:int -> IVsDataReader
protected function OnDeriveSchema(
    command : String, 
    commandType : DataCommandType, 
    parameters : IVsDataParameter[], 
    commandTimeout : int
) : IVsDataReader

Parameters

  • command
    Type: System.String

    The command for which the schema is derived.

  • commandTimeout
    Type: System.Int32

    Amount of time, in seconds, before which the command times out.

Return Value

Type: Microsoft.VisualStudio.Data.Services.SupportEntities.IVsDataReader
An IVsDataReader object. This object provides a forward-only, read-only data stream that describes the layout of items and blocks, that is, the schema, for the reader object returned upon executing the specified command.

.NET Framework Security

See Also

Reference

DataAsyncCommand Class

Microsoft.VisualStudio.Data.Framework Namespace