GetDataFieldValue Method

Overview

The GetDataFieldValue method reads a value from an IDataRow 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 field (column) does not exist in the row.

Declaration

/// <summary>
/// Gets data field value
/// </summary>
/// <typeparam name="T">Data field value type</typeparam>
/// <param name="dataRow">Data row</param>
/// <param name="columnName">Column name</param>
/// <returns>Data field value</returns>
/// Exception is thrown if table does not contain the column with specified name
public static T? GetDataFieldValue<T>(this IDataRow? dataRow, string columnName)

Namespace and Assembly

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

Behavior

• If dataRow is null, returns default(T).
• Attempts to read the raw value via TryGetValue. If not found, throws KeyNotFoundException.
• If the raw value is null, returns default(T).
• If T is nullable, conversion targets the underlying type.
• Attempts conversion using CompositeValueConverterFactory.Default with InvariantCulture. If conversion fails, returns default(T).
• If the conversion succeeds but casting to T fails, returns default(T).

Usage Example

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

// 2. Create an empty Department table
IDataTable departmentDataTable = dataSet.AddNewTable("Department");
departmentDataTable.AddColumn("Id", DataTypeNames.INT32);
departmentDataTable.AddColumn("Name", DataTypeNames.STRING);

// 3. Add a new row to the Department table
IDataRow departmentDataRow = departmentDataTable.AddNewRow();
departmentDataRow["Id"] = 1;
departmentDataRow["Name"] = "Customer Service";

// 4. Read back a value from the row, observe "Customer Service" as a name
string? name = departmentDataRow.GetDataFieldValue("Name");

 

Table of Content POCO DataSet DataRow Members

 

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Business Process Programming in .Net
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