GetFieldValue Method

Overview

The GetFieldValue method reads a field value from a table row and returns it as a strongly typed value. It is a table-level convenience wrapper that validates the row index and column name (case insensitive) before delegating the actual value extraction to ObservableDataRowExtensions.GetDataFieldValue<T>.

Declaration

/// <summary>
/// Gets field value from row at row with specified index
/// </summary>
/// <typeparam name="T">Value type</typeparam>
/// <param name="observableDataTable">Observable data table</param>
/// <param name="columnName">Column name</param>
/// <returns>Field value from row at row with specified index</returns>
public static T? GetFieldValue<T>(this IObservableDataTable? dataTable, int rowIndex, string columnName)

Namespace and Assembly

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

Behavior

• If dataTable is null, returns default(T).
• Validates that rowIndex is within [0..Rows.Count-1]; otherwise throws.
• Validates that the table contains columnName (using ContainsColumn); otherwise throws.
• Retrieves the row and returns ObservableDataRowExtensions.GetDataFieldValue<T>(dataRow, columnName).

Usage Example

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

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

IObservableDataRow departmentObservableDataRow1 = departmentObservableDataTable.AddNewRow();
departmentObservableDataRow1["Id"] = 1;
departmentObservableDataRow1["Name"] = "Reception";

// 3. Get department name as string
string? departmentName = departmentObservableDataTable.GetFieldValue<string>(0, "name");

 

Table of Content POCO DataSet Observable Data Table Members

 

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Business Process Programming in .Net
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