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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.data.dataview below:

DataView Class (System.Data) | Microsoft Learn

Represents a databindable, customized view of a DataTable for sorting, filtering, searching, editing, and navigation. The DataView does not store data, but instead represents a connected view of its corresponding DataTable. Changes to the DataView's data will affect the DataTable. Changes to the DataTable's data will affect all DataViews associated with it.

public ref class DataView : System::ComponentModel::MarshalByValueComponent, System::Collections::IList, System::ComponentModel::IBindingListView, System::ComponentModel::ISupportInitialize, System::ComponentModel::ISupportInitializeNotification, System::ComponentModel::ITypedList

public ref class DataView : System::ComponentModel::MarshalByValueComponent, System::Collections::IList, System::ComponentModel::IBindingList, System::ComponentModel::ISupportInitialize, System::ComponentModel::ITypedList

public ref class DataView : System::ComponentModel::MarshalByValueComponent, System::Collections::IList, System::ComponentModel::IBindingListView, System::ComponentModel::ISupportInitializeNotification, System::ComponentModel::ITypedList

public ref class DataView : System::ComponentModel::MarshalByValueComponent, System::ComponentModel::IBindingListView, System::ComponentModel::ISupportInitializeNotification, System::ComponentModel::ITypedList

public class DataView : System.ComponentModel.MarshalByValueComponent, System.Collections.IList, System.ComponentModel.IBindingListView, System.ComponentModel.ISupportInitialize, System.ComponentModel.ISupportInitializeNotification, System.ComponentModel.ITypedList

public class DataView : System.ComponentModel.MarshalByValueComponent, System.Collections.IList, System.ComponentModel.IBindingList, System.ComponentModel.ISupportInitialize, System.ComponentModel.ITypedList

public class DataView : System.ComponentModel.MarshalByValueComponent, System.Collections.IList, System.ComponentModel.IBindingListView, System.ComponentModel.ISupportInitializeNotification, System.ComponentModel.ITypedList

public class DataView : System.ComponentModel.MarshalByValueComponent, System.ComponentModel.IBindingListView, System.ComponentModel.ISupportInitializeNotification, System.ComponentModel.ITypedList

type DataView = class
    inherit MarshalByValueComponent
    interface ICollection
    interface IEnumerable
    interface IList
    interface IBindingList
    interface IBindingListView
    interface ISupportInitialize
    interface ISupportInitializeNotification
    interface ITypedList

type DataView = class
    inherit MarshalByValueComponent
    interface IBindingList
    interface IList
    interface ICollection
    interface IEnumerable
    interface ITypedList
    interface ISupportInitialize

type DataView = class
    inherit MarshalByValueComponent
    interface IBindingListView
    interface IBindingList
    interface IList
    interface ICollection
    interface IEnumerable
    interface ITypedList
    interface ISupportInitializeNotification
    interface ISupportInitialize

Public Class DataView
Inherits MarshalByValueComponent
Implements IBindingListView, IList, ISupportInitialize, ISupportInitializeNotification, ITypedList

Public Class DataView
Inherits MarshalByValueComponent
Implements IBindingList, IList, ISupportInitialize, ITypedList

Public Class DataView
Inherits MarshalByValueComponent
Implements IBindingListView, IList, ISupportInitializeNotification, ITypedList

Public Class DataView
Inherits MarshalByValueComponent
Implements IBindingListView, ISupportInitializeNotification, ITypedList

Inheritance

Implements

The following example creates a single DataTable with one column and five rows. Two DataView objects are created and the RowStateFilter is set on each to show different views of the table data. The values are then printed.

using System;
using System.Xml;
using System.Data;
using System.Data.Common;
using System.Windows.Forms;

public class Form1: Form
{
    protected DataSet DataSet1;
    protected DataGrid dataGrid1;

    private void DemonstrateDataView()
    {
        // Create one DataTable with one column.
        DataTable table = new DataTable("table");
        DataColumn colItem = new DataColumn("item",
            Type.GetType("System.String"));
        table.Columns.Add(colItem);

        // Add five items.
        DataRow NewRow;
        for(int i = 0; i <5; i++)
        {
            NewRow = table.NewRow();
            NewRow["item"] = "Item " + i;
            table.Rows.Add(NewRow);
        }
        // Change the values in the table.
        table.AcceptChanges();
        table.Rows[0]["item"]="cat";
        table.Rows[1]["item"] = "dog";

        // Create two DataView objects with the same table.
        DataView firstView = new DataView(table);
        DataView secondView = new DataView(table);

        // Print current table values.
        PrintTableOrView(table,"Current Values in Table");

        // Set first DataView to show only modified
        // versions of original rows.
        firstView.RowStateFilter=DataViewRowState.ModifiedOriginal;

        // Print values.
        PrintTableOrView(firstView,"First DataView: ModifiedOriginal");

        // Add one New row to the second view.
        DataRowView rowView;
        rowView=secondView.AddNew();
        rowView["item"] = "fish";

        // Set second DataView to show modified versions of
        // current rows, or New rows.
        secondView.RowStateFilter=DataViewRowState.ModifiedCurrent
            | DataViewRowState.Added;
        // Print modified and Added rows.
        PrintTableOrView(secondView,
            "Second DataView: ModifiedCurrent | Added");
    }

    private void PrintTableOrView(DataTable table, string label)
    {
        // This function prints values in the table or DataView.
        Console.WriteLine("\n" + label);
        for(int i = 0; i<table.Rows.Count;i++)
        {
            Console.WriteLine(table.Rows[i]["item"]);
        }
        Console.WriteLine();
    }

    private void PrintTableOrView(DataView view, string label)
    {

        // This overload prints values in the table or DataView.
        Console.WriteLine("\n" + label);
        for(int i = 0; i<view.Count;i++)
        {
            Console.WriteLine(view[i]["item"]);
        }
        Console.WriteLine();
    }
}

Private Sub DemonstrateDataView()
    ' Create one DataTable with one column.
    Dim table As New DataTable("table")
    Dim colItem As New DataColumn("item", _
        Type.GetType("System.String"))
    table.Columns.Add(colItem)

    ' Add five items.
    Dim NewRow As DataRow
    Dim i As Integer
    For i = 0 To 4
    
    NewRow = table.NewRow()
    NewRow("item") = "Item " & i
    table.Rows.Add(NewRow)
    Next
    table.AcceptChanges()

    ' Create two DataView objects with the same table.
    Dim firstView As New DataView(table)
    Dim secondView As New DataView(table)
    
    ' Change the values in the table.
    table.Rows(0)("item") = "cat"
    table.Rows(1)("item") = "dog"
    
    ' Print current table values.
    PrintTableOrView(table, "Current Values in Table")
        
    ' Set first DataView to show only modified versions of original rows.
    firstView.RowStateFilter = DataViewRowState.ModifiedOriginal

    ' Print values.    
    PrintTableOrView(firstView, "First DataView: ModifiedOriginal")

    ' Add one New row to the second view.
    Dim rowView As DataRowView
    rowView = secondView.AddNew()
    rowView("item") = "fish"
    ' Set second DataView to show modified versions of 
    ' current rows, or New rows.
    secondView.RowStateFilter = DataViewRowState.ModifiedCurrent _
        Or DataViewRowState.Added
    ' Print modified and Added rows.
    PrintTableOrView(secondView, _
        "Second DataView: ModifiedCurrent or Added")
End Sub
    
Overloads Private Sub PrintTableOrView( _
    ByVal view As DataView, ByVal label As String)
    Console.WriteLine(label)
    Dim i As Integer
    For i = 0 To view.count - 1
    
    Console.WriteLine(view(i)("item"))
    Next
    Console.WriteLine()
End Sub
    
Overloads Private Sub PrintTableOrView( _
    ByVal table As DataTable, ByVal label As String)
    Console.WriteLine(label)
    Dim i As Integer
    For i = 0 To table.Rows.Count - 1
    Console.WriteLine(table.Rows(i)("item"))
    Next
    Console.WriteLine()
End Sub

The following example creates a DataView of online orders ordered by total due from a LINQ to DataSet query:

DataTable orders = dataSet.Tables["SalesOrderHeader"];

EnumerableRowCollection<DataRow> query =
    from order in orders.AsEnumerable()
    where order.Field<bool>("OnlineOrderFlag") == true
    orderby order.Field<decimal>("TotalDue")
    select order;

DataView view = query.AsDataView();

bindingSource1.DataSource = view;

Dim orders As DataTable = dataSet.Tables("SalesOrderHeader")

Dim query = _
    From order In orders.AsEnumerable() _
    Where order.Field(Of Boolean)("OnlineOrderFlag") = True _
    Order By order.Field(Of Decimal)("TotalDue") _
    Select order

Dim view As DataView = query.AsDataView()
bindingSource1.DataSource = view

A major function of the DataView is to allow for data binding on both Windows Forms and Web Forms.

Additionally, a DataView can be customized to present a subset of data from the DataTable. This capability lets you have two controls bound to the same DataTable, but that show different versions of the data. For example, one control might be bound to a DataView that shows all the rows in the table, and a second might be configured to display only the rows that have been deleted from the DataTable. The DataTable also has a DefaultView property. This returns the default DataView for the table. For example, if you want to create a custom view on the table, set the RowFilter on the DataView returned by the DefaultView.

To create a filtered and sorted view of data, set the RowFilter and Sort properties. Then, use the Item[] property to return a single DataRowView.

You can also add and delete from the set of rows using the AddNew and Delete methods. When you use those methods, the RowStateFilter property can set to specify that only deleted rows or new rows be displayed by the DataView.

Note

If you do not explicitly specify sort criteria for DataView, the DataRowView objects in DataView are sorted based on the index of DataView's corresponding DataRow in the DataTable.Rows DataRowCollection.

LINQ to DataSet allows developers to create complex, powerful queries over a DataSet by using LINQ. A LINQ to DataSet query returns an enumeration of DataRow objects, however, which is not easily used in a binding scenario. DataView can be created from a LINQ to DataSet query and takes on the filtering and sorting characteristics of that query. LINQ to DataSet extends the functionality of the DataView by providing LINQ expression-based filtering and sorting, which allows for much more complex and powerful filtering and sorting operations than string-based filtering and sorting. See Data Binding and LINQ to DataSet for more information.

For a description of this member, see AddIndex(PropertyDescriptor).

For a description of this member, see AddNew().

For a description of this member, see AllowEdit.

For a description of this member, see AllowNew.

For a description of this member, see AllowRemove.

For a description of this member, see ApplySort(PropertyDescriptor, ListSortDirection).

For a description of this member, see Find(PropertyDescriptor, Object).

For a description of this member, see IsSorted.

For a description of this member, see RemoveIndex(PropertyDescriptor).

For a description of this member, see RemoveSort().

For a description of this member, see SortDirection.

For a description of this member, see SortProperty.

For a description of this member, see SupportsChangeNotification.

For a description of this member, see SupportsSearching.

For a description of this member, see SupportsSorting.

For a description of this member, see ApplySort(ListSortDescriptionCollection).

For a description of this member, see Filter.

For a description of this member, see RemoveFilter().

For a description of this member, see SortDescriptions.

For a description of this member, see SupportsAdvancedSorting.

For a description of this member, see SupportsFiltering.

For a description of this member, see IsSynchronized.

For a description of this member, see SyncRoot.

For a description of this member, see Add(Object).

For a description of this member, see Clear().

For a description of this member, see Contains(Object).

For a description of this member, see IndexOf(Object).

For a description of this member, see Insert(Int32, Object).

For a description of this member, see IsFixedSize.

For a description of this member, see IsReadOnly.

For a description of this member, see Item[Int32].

For a description of this member, see Remove(Object).

For a description of this member, see RemoveAt(Int32).

For a description of this member, see GetItemProperties(PropertyDescriptor[]).

For a description of this member, see GetListName(PropertyDescriptor[]).

This type is safe for multithreaded read operations. You must synchronize any write operations.

• DataSet
• DataTable
• DataViewManager
• AsDataView
• DataSets, DataTables, and DataViews (ADO.NET)

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