New to Telerik UI for WinForms? Start a free 30-day trial

DataHelper

Class

Common helper class. Implements most of ICommonDataHelper members

Definition

Assembly:Telerik.WinControls.RadChart.dll

Syntax:

public abstract class DataHelper

Inheritance: objectDataHelper

Derived Classes: DataTableDataHelper

Constructors

DataHelper()

protected DataHelper()

Properties

ColumnNameSupported

bool

Returns true if data source supports columns naming or false in other cases

public abstract bool ColumnNameSupported { get; }

ColumnsCount

int

Returns the data source columns count

public abstract int ColumnsCount { get; }

RowsCount

int

Returns the data source rows count

public abstract int RowsCount { get; }

Methods

GetColumnIndex(string)

Gets the column index by column name in the Data Source object

public abstract int GetColumnIndex(string columnName)

Parameters:columnNamestring

Column name

Returns:

int

Column index if column found or -1 if column not found

Remarks:

This method is not supported by all data sources

GetColumnName(int)

Gets the column name if it is supported by data source

public abstract string GetColumnName(int columnIndex)

Parameters:columnIndexint

Column index

Returns:

string

Column name if supported by a data source

GetDoubleValue(int, int)

Return the double value at the given row and column

public double GetDoubleValue(int rowIndex, int columnIndex)

Parameters:rowIndexint

Row position index

columnIndexint

Column index

Returns:

double

Double value at given column and row

GetFilteredColumn(int)

Return unique column's content

public object[] GetFilteredColumn(int columnIndex)

Parameters:columnIndexint

Column index

Returns:

object[]

Objects array with unique column values

GetGanttValuesColumns()

Returns all possible data source columns that could be used as Gantt series items

public int[] GetGanttValuesColumns()

Returns:

int[]

Data source columns array available for a Gantt series data binding

GetGroupsColumnIndex()

Returns possible groups column used for automatic data binding

public int GetGroupsColumnIndex()

Returns:

int

Automatically found possible column with repeating values for a data grouping

Remarks:

Only the first found numeric column will be checked. If such column is not found or does not contain repeatable values the -1 will be returned

GetLabelsColumnIndex(int)

Returns possible column used as labels source when group column present

public int GetLabelsColumnIndex(int groupColumn)

Parameters:groupColumnint

DataGroupColumn index in a data source

Returns:

int

Column index that can be used as a series item labels source

GetObjectValue(int, int)

Return the object value at the given row and column

public abstract object GetObjectValue(int rowIndex, int columnIndex)

Parameters:rowIndexint

Row position index

columnIndexint

Column index

Returns:

object

Object value at given column and row from data source

GetSortedAndFilteredColumn(int)

Return sorted unique column's content

public object[] GetSortedAndFilteredColumn(int columnIndex)

Parameters:columnIndexint

Column index

Returns:

object[]

Objects array with unique column values sorted ascending

GetStringValue(int, int)

Return the string value at the given row and column

public string GetStringValue(int rowIndex, int columnIndex)

Parameters:rowIndexint

Row position index

columnIndexint

Column index

Returns:

string

String value at given column and row of a data source

GetValuesXColumnIndex()

Gets possible series items X values column

public int GetValuesXColumnIndex()

Returns:

int

Possible series items X values column's index or -1 if no proper column found

GetValuesYColumnIndex()

Gets possible series items Y values column

public int GetValuesYColumnIndex()

Returns:

int

Possible series items Y values column's index or -1 if no proper column found

GetValuesYColumns()

Returns all possible series items Y values columns

public int[] GetValuesYColumns()

Returns:

int[]

Possible numeric columns array available for a data binding

IsColumnNumeric(int)

Returns true if given column contains numeric values

public abstract bool IsColumnNumeric(int columnIndex)

Parameters:columnIndexint

Column index

Returns:

bool

True if data source column contains numeric values

IsColumnString(int)

Returns true if given column contains string type values

public abstract bool IsColumnString(int columnIndex)

Parameters:columnIndexint

Column index

Returns:

bool

True if data source column contains string values

IsItemNumeric(int, int)

Returns true if value at the given position is numeric

public bool IsItemNumeric(int rowIndex, int columnIndex)

Parameters:rowIndexint

Row position index of data item in a data source

columnIndexint

Column index of data item in a data source

Returns:

bool

True if data item contains numeric value at given row and column

IsNullableType(Type)

Checks is given type is Nullable

protected static bool IsNullableType(Type type)

Parameters:typeType

Type to check

Returns:

bool

True if type is Nullable, or False

IsTypeNumeric(Type)

Checks whether the type given is numeric

protected static bool IsTypeNumeric(Type type)

Parameters:typeType

Type to check

Returns:

bool

True if Type is numeric

IsTypeString(Type)

Checks whether the type given is string type

protected static bool IsTypeString(Type type)

Parameters:typeType

Type to check

Returns:

bool

True if given type is string

IsValueString(object)

Checks whether the value's type is String

protected static bool IsValueString(object obj)

Parameters:objobject

Object to check

Returns:

bool

True if object can be converted to string