Tài liệu The DataTable Class pdf

The DataTable Class You use an object of the DataTable class to represent a table.. You can also store multiple Table 11.1: DataTable PROPERTIES PROPERTY TYPE DESCRIPTION string compari

The DataTable Class

You use an object of the DataTable class to represent a table You can also store multiple

Table 11.1: DataTable PROPERTIES

PROPERTY TYPE DESCRIPTION

string comparisons within DataTable objects are case-sensitive

ChildRelations DataRelationCollection Gets the collection of relations

(DataRelationCollection) that allows navigation from a parent table to a child table A

DataRelationCollection consists of DataRelation objects

(DataColumnCollection) that contains DataColumn objects that represent the columns

in the DataTable object

(ConstraintCollection) that contains Constraint objects that represent primary key

(UniqueConstraint) or foreign key constraints (ForeignKeyConstraint) in the DataTable object

belongs

of the rows in the DataTable have errors

are the primary keys for the DataTable

that contains the DataRow objects stored in the DataTable

Table 11.2: DataTable METHODS

METHOD RETURN

TYPE

DESCRIPTION

since it was loaded or since the last time the AcceptChanges() method was called

that clone

pass the filter criteria

it was last loaded or since the last time the AcceptChanges() method was called

have errors

matching object is found, a new row is created using the specified values

since it was created or since the last time the AcceptChanges() method was called

in the DataTable that match the specified filter string You can also pass a string containing details on how to sort the DataRow objects

Table 11.3: DataTable EVENTS

EVENT EVENT HANDLER DESCRIPTION

ColumnChanging DataColumnChangeEventHandler Fires before a changed

DataColumn value is committed in

a DataRow

ColumnChanged DataColumnChangeEventHandler Fires after a changed DataColumn

value is committed in a DataRow

committed in a DataTable

Table 11.3: DataTable EVENTS

EVENT EVENT HANDLER DESCRIPTION

committed in a DataTable

from a DataTable

from a DataTable