The DataRow Class

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The DataRow Class You use an object of the DataRow class to represent a row. You can also store multiple DataRow objects in a DataTable. Table 11.4 shows some of the DataRow properties.

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Nội dung Text: The DataRow Class

The DataRow Class You use an object of the DataRow class to represent a row. You can also store multiple DataRow objects in a DataTable. Table 11.4 shows some of the DataRow properties. Table 11.4: DataRow PROPERTIES PROPERTY TYPE DESCRIPTION HasErrors bool Returns a bool value that indicates whether any of the DataColumn objects in the DataRow have errors. ItemArray object[] Gets or sets all the DataColumn objects in the DataRow. RowState DataRowState Gets the current state of the DataRow. The state can be Added, Deleted, Detached~FT, Modified, or Unchanged. The state depends in the operation performed on the DataRow and whether the AcceptChanges() method has been called to commit the changes. Table DataTable Gets the DataTable object to which the DataRow belongs. The row has been created but isn't part of a DataRowCollection object; a DataRow is in this state immediately after it has been created and before it is added to a collection, or if it has been removed from a collection. Table 11.5 shows some of the DataRow methods. Table 11.5: DataRow METHODS METHOD RETURN DESCRIPTION TYPE AcceptChanges() void Commits all the changes made to the DataRow object since it was loaded or since the last time the AcceptChanges() method was called. BeginEdit() void Starts an edit for the DataRow object. CancelEdit() void Cancels an edit for the DataRow object and restores it to the original state. ClearErrors() void Clears any errors for the DataRow object. Delete() void Deletes the DataRow object. EndEdit() void Stops an edit for the DataRow object and commits the change. GetChildRows() DataRow[] Overloaded. Returns an array of DataRow objects
Table 11.5: DataRow METHODS METHOD RETURN DESCRIPTION TYPE that contain the child rows using the specified DataRelation object. GetColumnError() string Overloaded. Returns the description of the error for the specified DataColumn object. GetColumnsInError() DataColumn[] Returns an array of DataColumn objects that have errors. GetParentRow() DataRow Overloaded. Returns a DataRow object that contains the parent row using the specified DataRelation object. GetParentRows() DataRow[] Overloaded. Returns an array of DataRow objects that contain the parent rows using the specified DataRelation object. IsNull() bool Overloaded. Returns a bool value that indicates whether the specified DataColumn object contains a null value. RejectChanges() void Undoes all changes made to the DataRow object since the AcceptChanges() method was called. SetNull() void Sets the specified DataColumn object to a null value. SetParentRow() void Overloaded. Sets the parent row to the specified DataRow object.