EnumerableQueryResult

Overview

This class is used internally by DA Linq to represent Linq query results while processing them in the LinqDataAdapter or RemoteTable. Normally, you will never have to create instances of this class manually, as this is done by Data Abstract's Linq infrastructure.

Location

 

constructor  protected    (declared in QueryResult)

 

constructor

 

EnumerableQueryResult()

 

Sub New

constructor (IDataReader, array of Int32)

Creates a new instance of the EnumerableQueryResult class using the provided IDataReader instance and the array of offsets between the columns of this query and the dataset columns.

Note that the newly created EnumerableQueryResult instance uses the provided IDataReader instance to retrieve data, so you shouldn't close or dispose it.

 

constructor(aData: IDataReader; anOffsets: array of Int32)

 

EnumerableQueryResult(IDataReader aData, Int32[] anOffsets)

 

Sub New (aData As IDataReader, anOffsets As array of Int32)

Parameters:

  • aData: Data source for this QueryResult instance
  • anOffsets: This instance's column offsets

Count

Query columns count.

 

property Count: Int32 read;

 

Int32 Count { get; }

 

Property ReadOnly Count As Int32

GetValue

Retrieves the value of the column anOffsets[i] (see constructor parameters) from the underlying IDataReader and converts it to aConvertType.

Note: Culture System.Globalization.CultureInfo.InvariantCulture is used while converting data to the requested type.

 

method GetValue(i: Int32; convertType: Type): Object

 

Object GetValue(Int32 i, Type convertType)

 

Function GetValue(i As Int32, convertType As Type) As Object

Parameters:

  • i: EnumerableQueryResult column index
  • convertType:

IsDbNull

Returns true if the current value of the column i is null, otherwise returns false.

 

method IsDbNull(i: Int32): Boolean

 

Boolean IsDbNull(Int32 i)

 

Function IsDbNull(i As Int32) As Boolean

Parameters:

  • i: EnumerableQueryResult column index

Next

Retrieves the next row from the underlying IDataReader and returns true if this operation was successful.

 

method Next: Boolean

 

Boolean Next()

 

Function Next As Boolean

Reset

This method is not used in this class.

 

method Reset

 

void Reset()

 

Sub Reset

 

Count

Query columns count.

 

property Count: Int32 read;

 

Int32 Count { get; }

 

Property ReadOnly Count As Int32

 

constructor  protected    (declared in QueryResult)

 

constructor

 

EnumerableQueryResult()

 

Sub New

constructor (IDataReader, array of Int32)

Creates a new instance of the EnumerableQueryResult class using the provided IDataReader instance and the array of offsets between the columns of this query and the dataset columns.

Note that the newly created EnumerableQueryResult instance uses the provided IDataReader instance to retrieve data, so you shouldn't close or dispose it.

 

constructor(aData: IDataReader; anOffsets: array of Int32)

 

EnumerableQueryResult(IDataReader aData, Int32[] anOffsets)

 

Sub New (aData As IDataReader, anOffsets As array of Int32)

Parameters:

  • aData: Data source for this QueryResult instance
  • anOffsets: This instance's column offsets

GetValue

Retrieves the value of the column anOffsets[i] (see constructor parameters) from the underlying IDataReader and converts it to aConvertType.

Note: Culture System.Globalization.CultureInfo.InvariantCulture is used while converting data to the requested type.

 

method GetValue(i: Int32; convertType: Type): Object

 

Object GetValue(Int32 i, Type convertType)

 

Function GetValue(i As Int32, convertType As Type) As Object

Parameters:

  • i: EnumerableQueryResult column index
  • convertType:

IsDbNull

Returns true if the current value of the column i is null, otherwise returns false.

 

method IsDbNull(i: Int32): Boolean

 

Boolean IsDbNull(Int32 i)

 

Function IsDbNull(i As Int32) As Boolean

Parameters:

  • i: EnumerableQueryResult column index

Next

Retrieves the next row from the underlying IDataReader and returns true if this operation was successful.

 

method Next: Boolean

 

Boolean Next()

 

Function Next As Boolean

Reset

This method is not used in this class.

 

method Reset

 

void Reset()

 

Sub Reset