CopyToPoco Method

Overview

The CopyToPoco method copies values from an observable data row into an existing POCO instance by assigning the POCO’s public writable properties.

Property values are matched by name. For a POCO property named Name, the method looks for a row field with key "Name" first (case-sensitive), and if not found it tries a case-insensitive match against the row’s existing keys. If a matching field is missing, the property is left unchanged.

If a matching field exists but its value is DBNull.Value, the method treats it as null. Values are assigned using basic conversion rules for common types (including enums, Guid, and DateTime). If conversion is not possible, the original value is assigned as-is.

If observableDataRow or pocoInstance is null, the method returns without making changes.

Declaration

/// <summary>
/// Copies values from an observable data row into a POCO instance by assigning writable properties.
/// Matching between property names and existing row keys is case-insensitive.
/// </summary>
/// <typeparam name="T">POCO type</typeparam>
/// <param name="observableDataRow">Source observable data row</param>
/// <param name="pocoInstance">Target POCO instance to populate</param>
public static void CopyToPoco<T>(this IObservableDataRow? observableDataRow, T? pocoInstance)

Namespace and Assembly

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

Usage Example

Let’s assume the following POCO type:

internal class EmploymentType
{
  public int Id { get; set; }
  public string Code { get; set; }
  public string? Description { get; set; }
}

Copy data from a row into an existing POCO instance:

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

// 2. Create EmploymentType table and add a new row
IObservableDataTable employmentTypeObservableDataTable = observableDataSet.AddNewTable("EmploymentType");
employmentTypeObservableDataTable.AddColumn("Id", DataTypeNames.INT32);
employmentTypeObservableDataTable.AddColumn("Code", DataTypeNames.STRING);
employmentTypeObservableDataTable.AddColumn("Description", DataTypeNames.STRING);

IObservableDataRow employmentTypeObservableDataRow = employmentTypeObservableDataTable.AddNewRow();
employmentTypeObservableDataRow["Id"] = 1;
employmentTypeObservableDataRow["Code"] = "ET01";
employmentTypeObservableDataRow["Description"] = "Full Time";

// 3. Create POCO instance and populate it from the row
EmploymentType employmentTypePoco = new EmploymentType();
employmentTypeObservableDataRow.CopyToPoco(employmentTypePoco);

// 4. employmentTypePoco now contains row values
int id = employmentTypePoco.Id; // 1
string code = employmentTypePoco.Code; // "ET01"
string? desc = employmentTypePoco.Description; // "Full Time"

 

Table of Content POCO DataSet Observable Data Row Members

 

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Business Process Programming in .Net
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