RejectChanges Method

Overview

The RejectChanges method rejects all pending changes in a table and reverts the table to the last accepted state.

This method uses state-aware logic: it removes newly added rows from the table, and it reverts deleted or modified rows back to their original values and Unchanged state.

Declaration

/// <summary>
/// Rejects changes for an observable data table in an observable-aware way.
/// Added (and Detached) rows are removed from the observable table (raising RowsRemoved).
/// Modified and Deleted rows are reverted and RowStateChanged is raised.
/// </summary>
/// <param name="observableDataTable">Observable data table</param>
public static void RejectChanges(this IObservableDataTable? dataTable)

Namespace and Assembly

Namespace: PocoDataSet.ObservableExtensions
Assembly: PocoDataSet.ObservableExtensions.dll

Behavior

• If dataTable is null, returns immediately.
• Iterates rows from Rows.Count - 1 down to 0 so that removals do not affect remaining indices.
• For each row:
  • Added or Detached - removes the row from the table via RemoveRowAt(index). This discards new rows that were never part of the accepted baseline.
  • Deleted or Modified - calls IDataRow.RejectChanges() to restore original values and row state.
  • Unchanged - no action is taken.

Usage Example

// 1. Create observable data set
IObservableDataSet observableDataSet = new ObservableDataSet();

// 2. Create Department observable table with rows in different states
IObservableDataTable departmentObservableDataTable = observableDataSet.AddNewTable("Department");
departmentObservableDataTable.AddColumn("Id", DataTypeNames.INT32);
departmentObservableDataTable.AddColumn("Name", DataTypeNames.STRING);

// Row in Added state
IObservableDataRow departmentObservableDataRow1 = departmentObservableDataTable.AddNewRow();
departmentObservableDataRow1["Id"] = 1;
departmentObservableDataRow1["Name"] = "Reception";

// Row in Deleted state
IObservableDataRow departmentObservableDataRow2 = departmentObservableDataTable.AddNewRow();
departmentObservableDataRow2["Id"] = 2;
departmentObservableDataRow2["Name"] = "Sales";
departmentObservableDataRow2.AcceptChanges();
departmentObservableDataRow2.Delete();

// Row in Modified state
IObservableDataRow departmentObservableDataRow3 = departmentObservableDataTable.AddNewRow();
departmentObservableDataRow3["Id"] = 3;
departmentObservableDataRow3["Name"] = "Emergency";
departmentObservableDataRow3.AcceptChanges();
departmentObservableDataRow3["Name"] = "Finance";

// 3. Reject changes
observableDataSet.RejectChanges();

// 4. Verify results
// - departmentObservableDataRow1 (Added) is removed
// - departmentObservableDataRow2 (Deleted) is restored to Unchanged with original values
// - departmentObservableDataRow3 (Modified) is restored to Unchanged with original values

 

Table of Content POCO DataSet Observable Data Table Members

 

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Business Process Programming in .Net
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