GetDataFieldValue Method

Overview

The GetDataFieldValue method reads a value from an observable data row field and returns it as a strongly typed value. If the raw value is not already of the requested type, the method attempts to convert it using the framework’s composite value converter.

This method is intentionally tolerant: if conversion is not possible, it returns default(T) instead of throwing. The only exception case is when the requested column (case insensitive) does not exist in the row.

Declaration

/// <summary>
/// Gets data field value from inner data row
/// </summary>
/// <typeparam name="T">Value type</typeparam>
/// <param name="observableDataRow">Observable data row</param>
/// <param name="columnName">Column name</param>
/// <returns>Data field value</returns>
public static T? GetDataFieldValue(this IObservableDataRow? observableDataRow, string columnName)

Namespace and Assembly

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

Usage Example

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

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

IObservableDataRow departmentObservableDataRow = departmentObservableDataTable.AddNewRow();
departmentObservableDataRow["Id"] = 1;
departmentObservableDataRow["Name"] = "Sales";

// 3. Observe that indexer usage returns an objet
object? nameAsObject = departmentObservableDataRow["Name"];

// 4. Call GetDataFieldValue to get strongly typed value
string? name = departmentObservableDataRow.GetDataFieldValue<string>("name");

 

Table of Content POCO DataSet Observable Data Row Members

 

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Business Process Programming in .Net
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