RejectChanges Method

Overview

The RejectChanges method rejects changes across the entire data set. Internally, it iterates through all tables in the data set and calls RejectChanges() on each table.

Rejecting changes reverts the in-memory state back to the baseline values that were established by the last successful AcceptChanges call. It is typically used when the user cancels an edit operation and the application wants to discard all pending local changes.

Declaration

/// <summary>
/// Reject changes
/// </summary>
/// <param name="dataSet">Data set</param>
public static void RejectChanges(this IDataSet? dataSet)

Namespace and Assembly

Namespace: PocoDataSet.Extensions
Assembly: PocoDataSet.Extensions.dll

Behavior

• If dataSet is null, returns immediately.
• Iterates through all tables in dataSet.Tables and calls RejectChanges() on each table.
• Table-level RejectChanges() is responsible for the row-level rules (for example, removing Added rows, undeleting Deleted rows, restoring original values for Modified rows).

Important Notes

• RejectChanges is not a validation step. Validation should happen at application layers.
• RejectChanges is a local operation; it does not communicate with a database.

Usage Example

// 1. Create an empty data set
IDataSet dataSet = DataSetFactory.CreateDataSet();

// 2. Create data table with one row in Added state
IDataTable departmentDataTable = dataSet.AddNewTable("Department");
departmentDataTable.AddColumn("Id", DataTypeNames.INT32);
departmentDataTable.AddColumn("Name", DataTypeNames.STRING);

IDataRow departmentDataRow = departmentDataTable.AddNewRow();
departmentDataRow["Id"] = 1;
departmentDataRow["Name"] = "Reception";

// 3. Create data table with one row in Modified state
IDataTable employmentTypeDataTable = dataSet.AddNewTable("EmploymentType");
employmentTypeDataTable.AddColumn("Id", DataTypeNames.INT32);
employmentTypeDataTable.AddColumn("Code", DataTypeNames.STRING);
employmentTypeDataTable.AddColumn("Description", DataTypeNames.STRING);

IDataRow employmentTypeDataRow = employmentTypeDataTable.AddNewRow();
employmentTypeDataRow["Id"] = 1;
employmentTypeDataRow["Code"] = "ET01";
employmentTypeDataRow["Description"] = "Full Time";
employmentTypeDataRow.AcceptChanges();
employmentTypeDataRow["Description"] = "Part Time";

// 4. Create data table with one Deleted row
IDataTable employeeDataTable = dataSet.AddNewTable("Employee");
employeeDataTable.AddColumn("Id", DataTypeNames.INT32);
employeeDataTable.AddColumn("FirstName", DataTypeNames.STRING);
employeeDataTable.AddColumn("LastName", DataTypeNames.STRING);

IDataRow employeeDataRow = employeeDataTable.AddNewRow();
employeeDataRow["Id"] = 1;
employeeDataRow["FirstName"] = "John";
employeeDataRow["LastName"] = "Doe";
employeeDataTable.AcceptChanges();
employeeDataRow.Delete();

// 5. Reject changes at data set level
dataSet.RejectChanges();

// Expected result:
// - Department table without rows (Added row removed)
// - EmploymentType row restored to Unchanged: 1, ET01, Full Time
// - Employee row restored to Unchanged: 1, John, Doe

 

Table of Content POCO DataSet DataSet Members

 

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Business Process Programming in .Net
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