AllColumns Class

Corresponds to all columns from one or more data tables selected by a SelectQuery.

Namespace: DevExpress.DataAccess.Sql

Assembly: DevExpress.DataAccess.v18.1.dll

Declaration

C#

public sealed class AllColumns :
    ColumnBase

VB.NET

Public NotInheritable Class AllColumns
    Inherits ColumnBase

Related API Members

The following members accept/return AllColumns objects:

• SelectQuery.SelectAll()
• SelectQuery.SelectAll(Table)

Remarks

An AllColumns object is returned by the SelectQuery.SelectAll method.

Setting the AllColumns.Table property to null will select all columns from all selected data tables.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the AllColumns class.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

Reporting_data-source-wizard-how-to-customize-the-standard-query-builder-dialog-t333785/CS/ReplaceQueryBuilderSample/MyConfigureQueryPage.cs#L43

if (selectQuery != null && selectQuery.Tables.Count == 1 && selectQuery.Columns.Count == 1 && string.IsNullOrEmpty(selectQuery.FilterString) && selectQuery.Skip == 0) {
    var columns = selectQuery.Columns[0] as AllColumns;
    if (columns != null && columns.Table == null) {

VB.NET

Reporting_data-source-wizard-how-to-customize-the-standard-query-builder-dialog-t333785/VB/ReplaceQueryBuilderSample/MyConfigureQueryPage.vb#L46

If selectQuery IsNot Nothing AndAlso selectQuery.Tables.Count = 1 AndAlso selectQuery.Columns.Count = 1 AndAlso String.IsNullOrEmpty(selectQuery.FilterString) AndAlso selectQuery.Skip = 0 Then
    Dim columns = TryCast(selectQuery.Columns(0), AllColumns)
    If columns IsNot Nothing AndAlso columns.Table Is Nothing Then

Inheritance

Object

ColumnBase

AllColumns