Class DataSourceBase

Base class for all datasources such as TableDataSource.

Inheritance

System.Object

Base

DataComponentBase

Column

DataSourceBase

BusinessObjectDataSource

TableDataSource

ViewDataSource

Implements

IFRSerializable

IParent

Inherited Members

Column.PropName

Column.PropDescriptor

Column.Columns

Column.SetName(String)

Column.GetExpressions()

Column.CanContain(Base)

Column.GetChildObjects(ObjectCollection)

Column.AddChild(Base)

Column.RemoveChild(Base)

Column.GetChildOrder(Base)

Column.SetChildOrder(Base, Int32)

Column.UpdateLayout(Single, Single)

DataComponentBase.Enabled

DataComponentBase.ReferenceName

DataComponentBase.Reference

DataComponentBase.IsAliased

DataComponentBase.Assign(Base)

Base.Name

Base.Restrictions

Base.Flags

Base.Parent

Base.BaseName

Base.ClassName

Base.Report

Base.Page

Base.ChildObjects

Base.AllObjects

Base.ZOrder

Base.IsAncestor

Base.IsDesigning

Base.IsPrinting

Base.IsRunning

Base.OriginalComponent

Base.Disposed

Base.SetProp(Base, Base)

Base.FloatDiff(Single, Single)

Base.DeserializeSubItems(FRReader)

Base.ExtractDefaultMacros(String)

Base.Dispose(Boolean)

Base.Dispose()

Base.SetFlags(Flags, Boolean)

Base.SetReport(Report)

Base.SetParent(Base)

Base.SetParentCore(Base)

Base.FindObject(String)

Base.CreateUniqueName()

Base.Clear()

Base.BaseAssign(Base)

Base.AssignAll(Base)

Base.HasParent(Base)

Base.HasFlag(Flags)

Base.HasRestriction(Restrictions)

Base.InvokeEvent(String, Object)

Base.OnAfterLoad()

Base.GetCustomScript()

Base.ExtractMacros()

Base.IsHaveToConvert(Object)

Base.GetConvertedObjects()

Base.ForEachAllConvectedObjects(Object)

Namespace: FastReport.Data

Assembly: FastReport.Base.dll

Syntax

public abstract class DataSourceBase : Column, IDisposable, IFRSerializable, IParent

Constructors

DataSourceBase()

Initializes a new instance of the DataSourceBase class with default settings.

Declaration

public DataSourceBase()

Fields

currentRow

Declaration

protected object currentRow

Field Value

Type	Description
System.Object

Properties

Alias

Gets or sets alias of this object.

Declaration

public string Alias { get; set; }

Property Value

Type	Description
System.String

Remarks

Alias is a human-friendly name of this object. It may contain any symbols (including spaces and national symbols).

BindableControl

This property is not relevant to this class.

Declaration

public ColumnBindableControl BindableControl { get; set; }

Property Value

Type	Description
ColumnBindableControl

Calculated

This property is not relevant to this class.

Declaration

public bool Calculated { get; set; }

Property Value

Type	Description
System.Boolean

CurrentRow

Gets the current data row.

Declaration

public object CurrentRow { get; }

Property Value

Type	Description
System.Object

Remarks

This property is updated when you call the Next() method.

CurrentRowNo

Gets an index of current data row.

Declaration

public int CurrentRowNo { get; set; }

Property Value

Type	Description
System.Int32

Remarks

You should initialize the datasource by the Init method before using this property.

This property is updated when you call the Next() method.

CustomBindableControl

This property is not relevant to this class.

Declaration

public string CustomBindableControl { get; set; }

Property Value

Type	Description
System.String

DataType

This property is not relevant to this class.

Declaration

public Type DataType { get; set; }

Property Value

Type	Description
System.Type

Expression

This property is not relevant to this class.

Declaration

public string Expression { get; set; }

Property Value

Type	Description
System.String

ForceLoadData

Forces loading of data for this datasource.

Declaration

public bool ForceLoadData { get; set; }

Property Value

Type	Description
System.Boolean

Remarks

This property is false by default. Set it to true if you need to reload data each time when the datasource initialized. Note that this may slow down the performance.

Format

This property is not relevant to this class.

Declaration

public ColumnFormat Format { get; set; }

Property Value

Type	Description
ColumnFormat

HasMoreRows

Gets a value indicating that datasource has more rows, that is the CurrentRowNo is less than the RowCount.

Declaration

public bool HasMoreRows { get; }

Property Value

Type	Description
System.Boolean

Remarks

You should initialize the datasource by the Init method before using this property.

Usually this property is used with the following code block:

dataSource.Init();
while (dataSource.HasMoreRows)
{
  // do something...
  dataSource.Next();
}

Item[Column]

Gets data stored in a specified column.

Declaration

public object this[Column column] { get; }

Parameters

Type	Name	Description
Column	column	The column.

Property Value

Type	Description
System.Object	The column's value.

Remarks

You should initialize the datasource by the Init method before using this property.

Item[String]

Gets data stored in a specified column.

Declaration

public object this[string columnAlias] { get; }

Parameters

Type	Name	Description
System.String	columnAlias	Alias of a column.

Property Value

Type	Description
System.Object	The column's value.

Remarks

You should initialize the datasource by the Init method before using this property.

RowCount

Gets a number of data rows in this datasource.

Declaration

public int RowCount { get; }

Property Value

Type	Description
System.Int32

Remarks

You should initialize the datasource by the Init method before using this property.

Methods

Deserialize(FRReader)

Deserializes the object.

Declaration

public override void Deserialize(FRReader reader)

Parameters

Type	Name	Description
FRReader	reader	Reader object.

Overrides

Base.Deserialize(FRReader)

Remarks

Do not call this method directly. You should override it if you are developing a new component for FastReport.

This method is called when the object needs to restore the state. It may happen when:

loading the report from a file or stream;
loading the report from the designer's undo buffer;
assigning another object to this object using the Assign(Base) or AssignAll methods;
loading the object from the designer's clipboard;
loading the object from the preview pages.

EnsureInit()

Initializes the data source if it is not initialized yet.

Declaration

public void EnsureInit()

First()

Navigates to the first row.

Declaration

public void First()

Remarks

You should initialize the datasource by the Init method before using this method.

GetValue(Column)

Gets data stored in a specified column.

Declaration

protected abstract object GetValue(Column column)

Parameters

Type	Name	Description
Column	column	The column.

Returns

Type	Description
System.Object	An object that contains the data.

GetValue(String)

Gets data stored in a specified column.

Declaration

protected virtual object GetValue(string alias)

Parameters

Type	Name	Description
System.String	alias	The column alias.

Returns

Type	Description
System.Object	An object that contains the data.

Init()

Initializes this datasource.

Declaration

public void Init()

Remarks

This method fills the table with data. You should always call it before using most of datasource properties.

Init(DataSourceBase)

Initializes this datasource and filters data rows according to the master-detail relation between this datasource and parentData.

Declaration

public void Init(DataSourceBase parentData)

Parameters

Type	Name	Description
DataSourceBase	parentData	Parent datasource.

Remarks

To use master-detail relation, you must define the Relation object that describes the relation, and add it to the Report.Dictionary.Relations collection.

Init(DataSourceBase, String, SortCollection)

Initializes this datasource and filters data rows according to the master-detail relation between this datasource and parentData. Also applies the specified filter and sorts the rows.

Declaration

public void Init(DataSourceBase parentData, string filter, SortCollection sort)

Parameters

Type	Name	Description
DataSourceBase	parentData	Parent datasource.
System.String	filter	The filter expression.
SortCollection	sort	The collection of sort descriptors.

Remarks

To use master-detail relation, you must define the Relation object that describes the relation, and add it to the Report.Dictionary.Relations collection.

Init(Relation, String, SortCollection)

Initializes this datasource and filters data rows according to the master-detail relation. Also applies the specified filter and sorts the rows.

Declaration

public void Init(Relation relation, string filter, SortCollection sort)

Parameters

Type	Name	Description
Relation	relation	The master-detail relation.
System.String	filter	The filter expression.
SortCollection	sort	The collection of sort descriptors.

Remarks

To use master-detail relation, you must define the Relation object that describes the relation, and add it to the Report.Dictionary.Relations collection.

Init(String)

Initializes this datasource and applies the specified filter.

Declaration

public void Init(string filter)

Parameters

Type	Name	Description
System.String	filter	The filter expression.

Init(String, SortCollection)

Initializes this datasource, applies the specified filter and sorts the rows.

Declaration

public void Init(string filter, SortCollection sort)

Parameters

Type	Name	Description
System.String	filter	The filter expression.
SortCollection	sort	The collection of sort descriptors.

InitializeComponent()

Initializes the object before running a report.

Declaration

public override void InitializeComponent()

Overrides

DataComponentBase.InitializeComponent()

Remarks

This method is used by the report engine, do not call it directly.

InitSchema()

Initializes the datasource schema.

Declaration

public abstract void InitSchema()

Remarks

This method is used to support the FastReport.Net infrastructure. Do not call it directly.

LoadData(ArrayList)

Loads the datasource with data.

Declaration

public abstract void LoadData(ArrayList rows)

Parameters

Type	Name	Description
System.Collections.ArrayList	rows	Rows to fill with data.

Remarks

This method is used to support the FastReport.Net infrastructure. Do not call it directly.

Next()

Navigates to the next row.

Declaration

public void Next()

Remarks

You should initialize the datasource by the Init method before using this method.

Prior()

Navigates to the prior row.

Declaration

public void Prior()

Remarks

You should initialize the datasource by the Init method before using this method.

Serialize(FRWriter)

Serializes the object.

Declaration

public override void Serialize(FRWriter writer)

Parameters

Type	Name	Description
FRWriter	writer	Writer object.

Overrides

Column.Serialize(FRWriter)

Remarks

Do not call this method directly. You should override it if you are developing a new component for FastReport.

This method is called when the object needs to save the state. It may happen when:

saving the report to the file or stream;
saving the report to the designer's undo buffer;
assigning the object to another object using the Assign(Base) or AssignAll methods;
saving the object to the designer's clipboard;
saving the object to the preview (when run a report).

Events

Load

Occurs when the FastReport engine loads data source with data.

Declaration

public event EventHandler Load

Event Type

Type	Description
System.EventHandler

Remarks

Use this event if you want to implement load-on-demand. Event handler must load the data into the data object which this datasource is bound to (for example, the TableDataSource uses data from the DataTable object bound to the Table property).

Implements

IFRSerializable

IParent