GetDataFieldValue Method

Overview

The GetDataFieldValue method reads a value from an IObservableDataRow 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 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
/// IObservableDataRow interface implementation
/// </summary>
/// <typeparam name="T">Data field value type</typeparam>
/// <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>(string columnName)

Namespace and Assembly

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

Behavior

• 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 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();
departmentObservableDataRow1["Id"] = 1;
departmentObservableDataRow1["Name"] = "Marketing";

// 4. Read back a value from the row, observe "Marketing" as a name
string? name = departmentObservableDataRow1.GetDataFieldValue("Name");

 

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

 

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Business Process Programming in .Net
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