Class DataHelper

Common helper class. Implements most of ICommonDataHelper members

Inheritance
System.Object
DataHelper
DataTableDataHelper
Inherited Members
System.Object.ToString()
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
Namespace: Telerik.Charting
Assembly: Telerik.WinControls.RadChart.dll

Syntax

public abstract class DataHelper : ICommonDataHelper

Constructors

DataHelper()

Declaration
protected DataHelper()

Properties

ColumnNameSupported

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

Declaration
public abstract bool ColumnNameSupported { get; }
Property Value
System.Boolean

ColumnsCount

Returns the data source columns count

Declaration
public abstract int ColumnsCount { get; }
Property Value
System.Int32

RowsCount

Returns the data source rows count

Declaration
public abstract int RowsCount { get; }
Property Value
System.Int32

Methods

GetColumnIndex(String)

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

Declaration
public abstract int GetColumnIndex(string columnName)
Parameters
System.String columnName

Column name
Returns
System.Int32

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

This method is not supported by all data sources

GetColumnName(Int32)

Gets the column name if it is supported by data source

Declaration
public abstract string GetColumnName(int columnIndex)
Parameters
System.Int32 columnIndex

Column index
Returns
System.String

Column name if supported by a data source

GetDoubleValue(Int32, Int32)

Return the double value at the given row and column

Declaration
public double GetDoubleValue(int rowIndex, int columnIndex)
Parameters
System.Int32 rowIndex

Row position index
System.Int32 columnIndex

Column index
Returns
System.Double

Double value at given column and row

GetFilteredColumn(Int32)

Return unique column's content

Declaration
public object[] GetFilteredColumn(int columnIndex)
Parameters
System.Int32 columnIndex

Column index
Returns
System.Object[]

Objects array with unique column values

GetGanttValuesColumns()

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

Declaration
public int[] GetGanttValuesColumns()
Returns
System.Int32[]

Data source columns array available for a Gantt series data binding

GetGroupsColumnIndex()

Returns possible groups column used for automatic data binding

Declaration
public int GetGroupsColumnIndex()
Returns
System.Int32

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(Int32)

Returns possible column used as labels source when group column present

Declaration
public int GetLabelsColumnIndex(int groupColumn)
Parameters
System.Int32 groupColumn

DataGroupColumn index in a data source
Returns
System.Int32

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

GetObjectValue(Int32, Int32)

Return the object value at the given row and column

Declaration
public abstract object GetObjectValue(int rowIndex, int columnIndex)
Parameters
System.Int32 rowIndex

Row position index
System.Int32 columnIndex

Column index
Returns
System.Object

Object value at given column and row from data source

GetSortedAndFilteredColumn(Int32)

Return sorted unique column's content

Declaration
public object[] GetSortedAndFilteredColumn(int columnIndex)
Parameters
System.Int32 columnIndex

Column index
Returns
System.Object[]

Objects array with unique column values sorted ascending

GetStringValue(Int32, Int32)

Return the string value at the given row and column

Declaration
public string GetStringValue(int rowIndex, int columnIndex)
Parameters
System.Int32 rowIndex

Row position index
System.Int32 columnIndex

Column index
Returns
System.String

String value at given column and row of a data source

GetValuesXColumnIndex()

Gets possible series items X values column

Declaration
public int GetValuesXColumnIndex()
Returns
System.Int32

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

GetValuesYColumnIndex()

Gets possible series items Y values column

Declaration
public int GetValuesYColumnIndex()
Returns
System.Int32

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

GetValuesYColumns()

Returns all possible series items Y values columns

Declaration
public int[] GetValuesYColumns()
Returns
System.Int32[]

Possible numeric columns array available for a data binding

IsColumnNumeric(Int32)

Returns true if given column contains numeric values

Declaration
public abstract bool IsColumnNumeric(int columnIndex)
Parameters
System.Int32 columnIndex

Column index
Returns
System.Boolean

True if data source column contains numeric values

IsColumnString(Int32)

Returns true if given column contains string type values

Declaration
public abstract bool IsColumnString(int columnIndex)
Parameters
System.Int32 columnIndex

Column index
Returns
System.Boolean

True if data source column contains string values

IsItemNumeric(Int32, Int32)

Returns true if value at the given position is numeric

Declaration
public bool IsItemNumeric(int rowIndex, int columnIndex)
Parameters
System.Int32 rowIndex

Row position index of data item in a data source
System.Int32 columnIndex

Column index of data item in a data source
Returns
System.Boolean

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

IsNullableType(Type)

Checks is given type is Nullable

Declaration
protected static bool IsNullableType(Type type)
Parameters
System.Type type

Type to check
Returns
System.Boolean

True if type is Nullable, or False

IsTypeNumeric(Type)

Checks whether the type given is numeric

Declaration
protected static bool IsTypeNumeric(Type type)
Parameters
System.Type type

Type to check
Returns
System.Boolean

True if Type is numeric

IsTypeString(Type)

Checks whether the type given is string type

Declaration
protected static bool IsTypeString(Type type)
Parameters
System.Type type

Type to check
Returns
System.Boolean

True if given type is string

IsValueString(Object)

Checks whether the value's type is String

Declaration
protected static bool IsValueString(object obj)
Parameters
System.Object obj

Object to check
Returns
System.Boolean

True if object can be converted to string

Extension Methods