DataFieldValueChanged Event

Overview

Notifies subscribers when the value of a data field changes.

Declaration

/// <summary>
/// Standard .NET property change notification (interop for WPF/WinUI/MAUI, etc.).
/// For column updates performed through the indexer, ObservableDataRow raises:
/// - PropertyChanged(columnName)
/// - PropertyChanged("Item[]") to signal indexer updates.
/// IObservableDataRow interface implementation
/// </summary>
public event EventHandler<DataFieldValueChangedEventArgs>? DataFieldValueChanged;

Namespace and Assembly

Namespace: PocoDataSet.ObservableData
Assembly: PocoDataSet.ObservableData.dll

Behavior

• Raised by ObservableDataRow when the corresponding condition occurs.
• If no handlers are attached, raising the event has no side effects.

Usage Example

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

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

// 3. Add observable data row to Department observable table
IObservableDataRow departmentObservableDataRow1 = departmentObservableDataTable.AddNewRow();

// 4. Subscribe to the DataFieldValueChange event of the observable data row
departmentObservableDataRow1.DataFieldValueChanged += DepartmentObservableDataRow1_DataFieldValueChanged;

// 5. Change any value of the observable data row and observe that event was raised and handled
departmentObservableDataRow1["Name"] = "Marketing";

private void DepartmentObservableDataRow1_DataFieldValueChanged(object? sender, DataFieldValueChangedEventArgs e)
{
    // columnName = "Name"
    string columnName = e.ColumnName;
}

 

Table of Content POCO DataSet API References ObservablePOCO DataSet Types ObservableDataRow Members

 

---

Business Process Programming in .Net
© 2004–2026 Laskarzhevsky Software Inc.
Unless otherwise noted, the content of this website is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).
Code examples are provided under the MIT License.
You are free to share and adapt the material provided that appropriate credit is given and any modifications are clearly indicated.
The information provided on this website is for educational purposes only.
The author and publisher make no warranties regarding the completeness or suitability of the information and are not responsible for any damages resulting from its use.