DataRowFactory Class

Overview

The DataRowFactory class is a static helper that creates IDataRow instances for common scenarios. It centralizes row creation logic, including optional initialization of internal storage capacity and applying default values based on column metadata.

Namespace and Assembly

Namespace: PocoDataSet.Data
Assembly: PocoDataSet.Data.dll

Declaration

public static class DataRowFactory
{
    public static IDataRow CreateEmpty(int initialCapacity = 0);
    public static IDataRow CreateFromColumnsWithDefaults(IReadOnlyList<IColumnMetadata> listOfColumnMetadata);
}

Public Methods

• IDataRow CreateEmpty(int initialCapacity = 0)
  Creates an empty IDataRow (no predefined column values). If initialCapacity is greater than zero, the underlying value storage is pre-sized to reduce dictionary resizing during assignments.
• IDataRow CreateFromColumnsWithDefaults(IReadOnlyList<IColumnMetadata> listOfColumnMetadata)
  Creates a new IDataRow and initializes each column listed in listOfColumnMetadata with a default value. Default values are computed using MetadataDefaults.GetDefaultValue based on each column s data type and nullability. This method is typically used to create rows consistent with a table schema.

Usage Example

// 1. Create a table schema (column metadata)
IDataSet dataSet = DataSetFactory.CreateDataSet();
IDataTable departmentDataTable = dataSet.AddNewTable("Department");
departmentDataTable.AddColumn("Id", DataTypeNames.INT32);
departmentDataTable.AddColumn("Name", DataTypeNames.STRING);

// 2. Create a new row with default values based on column metadata
IDataRow departmentDataRow = DataRowFactory.CreateFromColumnsWithDefaults(departmentDataTable.Columns);

// 3. Read a default-initialized value (example)
object? nameValue = departmentDataRow["Name"];

Usage Notes

• Use CreateEmpty when you need a row that will be populated later.
• Use CreateFromColumnsWithDefaults to initialize a row in a schema-driven UI (for example, dynamic forms).
• If you are creating many rows, specifying a suitable initialCapacity can reduce allocations.

 

Table of Content POCO DataSet PocoDataSet.Data

 

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Business Process Programming in .Net
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