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ToView

Extend collections implementing IList to return a DataView. In cases where filters need to be applied to data, this extension will prove handy.

Source

/// <summary>
/// Extend any collection implementing IList to return a DataView.
/// </summary>
/// <param name="list">IList (Could be List<Type>)</param>
/// <returns>DataView</returns>
public static DataView ToView(this IList list) 
{
    // Validate Source
    if (list.Count < 1)                                             
        return null;

    // Initialize DataTable and get all properties from the first Item in the List.
    DataTable table = new DataTable(list.GetType().Name);
    PropertyInfo[] properties = list[0].GetType().GetProperties();

    // Build all columns from properties found. (Custom attributes could be added later)
    foreach (PropertyInfo info in properties)
    {
        try
        {
            table.Columns.Add(new DataColumn(info.Name, info.PropertyType));
        }
        catch (NotSupportedException)
        {
            // DataTable does not support Nullable types, we want to keep underlying type.
            table.Columns.Add(new DataColumn(info.Name, Nullable.GetUnderlyingType(info.PropertyType)));
        }
        catch (Exception)
        {
            table.Columns.Add(new DataColumn(info.Name, typeof(object)));
        }
    }

    // Add all rows
    for (int index = 0; index < list.Count; index++)
    {
        object[] row = new object[properties.Length];

        for (int i = 0; i < row.Length; i++)
        {
            row[i] = properties[i].GetValue(list[index], null); // Get the value for each items property
        }

        table.Rows.Add(row);
    }

    return new DataView(table); ;
}

Example

public class TestEntity
{
    public int ID { get; private set; }
    public string Name { get; set; }

    public TestEntity(int ID, string Name)
    {
        this.ID = ID;
        this.Name = Name;
    }

    public static List<TestEntity> GetTestData()
    {
        List<TestEntity> test = new List<TestEntity>();
        test.Add(new TestEntity(1, "Test 1"));
        test.Add(new TestEntity(2, "Test 2"));
        test.Add(new TestEntity(3, "Test 3"));
        test.Add(new TestEntity(4, "Test 4"));

        return test;
    }

    public static System.Data.DataView GetView(List<TestEntity> list)
    {
        return list.ToView();
    }
}

Author: Felipe Ramos

Submitted on: 23 feb 2011

Language: C#

Type: System.Collections.IList

Views: 3122