DataTable.Select Méthode

Définition

Obtient un tableau d’objets DataRow.Gets an array of DataRow objects.

Surcharges

Select()

Obtient un tableau de tous les objets DataRow.Gets an array of all DataRow objects.

Select(String)

Obtient un tableau de tous les objets DataRow qui correspondent aux critères de filtre.Gets an array of all DataRow objects that match the filter criteria.

Select(String, String)

Obtient un tableau de tous les objets DataRow qui correspondent aux critères de filtre, dans l'ordre de tri spécifié.Gets an array of all DataRow objects that match the filter criteria, in the specified sort order.

Select(String, String, DataViewRowState)

Obtient un tableau de tous les objets DataRow qui correspondent au filtre et à l'état spécifié, dans l'ordre de tri.Gets an array of all DataRow objects that match the filter in the order of the sort that match the specified state.

Select()

Obtient un tableau de tous les objets DataRow.Gets an array of all DataRow objects.

public:
 cli::array <System::Data::DataRow ^> ^ Select();
public System.Data.DataRow[] Select ();
member this.Select : unit -> System.Data.DataRow[]
Public Function Select () As DataRow()

Retours

Tableau d'objets DataRow.An array of DataRow objects.

Exemples

L’exemple suivant retourne un tableau d' DataRow objets par le Select biais de la méthode.The following example returns an array of DataRow objects through the Select method.

private void GetRows()
{
    // Get the DataTable of a DataSet.
    DataTable table = DataSet1.Tables["Suppliers"];
    DataRow[] rows = table.Select();

    // Print the value one column of each DataRow.
    for(int i = 0; i < rows.Length ; i++)
    {
        Console.WriteLine(rows[i]["CompanyName"]);
    }
}
Private Sub GetRows()
    ' Get the DataTable of a DataSet.
    Dim table As DataTable = DataSet1.Tables("Suppliers")
    Dim rows() As DataRow = table.Select()

    Dim i As Integer
    ' Print the value one column of each DataRow.
    For i = 0 to rows.GetUpperBound(0)
       Console.WriteLine(rows(i)("CompanyName"))
    Next i
End Sub

Remarques

Pour garantir l’ordre de tri approprié, spécifiez des Select(String, String) critères Select(String, String, DataViewRowState)de tri avec ou.To ensure the proper sort order, specify sort criteria with Select(String, String) or Select(String, String, DataViewRowState).

Voir aussi

Select(String)

Obtient un tableau de tous les objets DataRow qui correspondent aux critères de filtre.Gets an array of all DataRow objects that match the filter criteria.

public:
 cli::array <System::Data::DataRow ^> ^ Select(System::String ^ filterExpression);
public System.Data.DataRow[] Select (string filterExpression);
member this.Select : string -> System.Data.DataRow[]
Public Function Select (filterExpression As String) As DataRow()

Paramètres

filterExpression
String

Critères à utiliser pour filtrer les lignes.The criteria to use to filter the rows. Pour obtenir des exemples sur la manière de filtrer les lignes, consultez la rubrique relative à la syntaxe DataView RowFilter [C#].For examples on how to filter rows, see DataView RowFilter Syntax [C#].

Retours

Tableau d'objets DataRow.An array of DataRow objects.

Exemples

L’exemple suivant utilise une expression de filtre pour retourner un tableau DataRow d’objets.The following example uses a filter expression to return an array of DataRow objects.

private void GetRowsByFilter()
{
    DataTable table = DataSet1.Tables["Orders"];
    // Presuming the DataTable has a column named Date.
    string expression;
    expression = "Date > #1/1/00#";
    DataRow[] foundRows;

    // Use the Select method to find all rows matching the filter.
    foundRows = table.Select(expression);

    // Print column 0 of each returned row.
    for(int i = 0; i < foundRows.Length; i ++)
    {
        Console.WriteLine(foundRows[i][0]);
    }
}
Private Sub GetRowsByFilter()
    
    Dim table As DataTable = DataSet1.Tables("Orders")

    ' Presuming the DataTable has a column named Date.
    Dim expression As String
    expression = "Date > #1/1/00#"
    Dim foundRows() As DataRow

    ' Use the Select method to find all rows matching the filter.
    foundRows = table.Select(expression)

    Dim i As Integer
    ' Print column 0 of each returned row.
    For i = 0 to foundRows.GetUpperBound(0)
       Console.WriteLine(foundRows(i)(0))
    Next i
End Sub

Remarques

Pour créer l' filterExpression argument, utilisez les mêmes règles que celles qui s' DataColumn appliquent Expression à la valeur de propriété de la classe pour la création de filtres.To create the filterExpression argument, use the same rules that apply to the DataColumn class's Expression property value for creating filters.

Pour garantir l’ordre de tri approprié, spécifiez des Select(String, String) critères Select(String, String, DataViewRowState)de tri avec ou.To ensure the proper sort order, specify sort criteria with Select(String, String) or Select(String, String, DataViewRowState).

Si la colonne sur le filtre contient une valeur null, elle ne fait pas partie du résultat.If the column on the filter contains a null value, it will not be part of the result.

Voir aussi

Select(String, String)

Obtient un tableau de tous les objets DataRow qui correspondent aux critères de filtre, dans l'ordre de tri spécifié.Gets an array of all DataRow objects that match the filter criteria, in the specified sort order.

public:
 cli::array <System::Data::DataRow ^> ^ Select(System::String ^ filterExpression, System::String ^ sort);
public System.Data.DataRow[] Select (string filterExpression, string sort);
member this.Select : string * string -> System.Data.DataRow[]
Public Function Select (filterExpression As String, sort As String) As DataRow()

Paramètres

filterExpression
String

Critères à utiliser pour filtrer les lignes.The criteria to use to filter the rows. Pour obtenir des exemples sur la manière de filtrer les lignes, consultez la rubrique relative à la syntaxe DataView RowFilter [C#].For examples on how to filter rows, see DataView RowFilter Syntax [C#].

sort
String

Chaîne spécifiant la colonne et le sens du tri.A string specifying the column and sort direction.

Retours

Tableau d'objets DataRow correspondant à l'expression de filtre.An array of DataRow objects matching the filter expression.

Exemples

L’exemple suivant utilise une expression de filtre pour retourner un tableau DataRow d’objets.The following example uses a filter expression to return an array of DataRow objects.

using System;
using System.Data;

public class A {  

   public static void Main() {      
      DataTable table = new DataTable("Orders");
      table.Columns.Add("OrderID", typeof(Int32));
      table.Columns.Add("OrderQuantity", typeof(Int32));
      table.Columns.Add("CompanyName", typeof(string));      
      table.Columns.Add("Date", typeof(DateTime));

      DataRow newRow = table.NewRow();
      newRow["OrderID"] = 1;
      newRow["OrderQuantity"] = 3;
      newRow["CompanyName"] = "NewCompanyName";
      newRow["Date"] = "1979, 1, 31";

      // Add the row to the rows collection.
      table.Rows.Add(newRow);
      
      DataRow newRow2 = table.NewRow();
      newRow2["OrderID"] = 2;
      newRow2["OrderQuantity"] = 2;
      newRow2["CompanyName"] = "NewCompanyName1";
      table.Rows.Add(newRow2);

      DataRow newRow3 = table.NewRow();
      newRow3["OrderID"] = 3;
      newRow3["OrderQuantity"] = 2;
      newRow3["CompanyName"] = "NewCompanyName2";
      table.Rows.Add(newRow3);

      // Presuming the DataTable has a column named Date.
      string expression = "Date = '1/31/1979' or OrderID = 2";
      // string expression = "OrderQuantity = 2 and OrderID = 2";

      // Sort descending by column named CompanyName.
      string sortOrder = "CompanyName ASC";
      DataRow[] foundRows;

      // Use the Select method to find all rows matching the filter.
      foundRows = table.Select(expression, sortOrder);

      // Print column 0 of each returned row.
      for (int i = 0; i < foundRows.Length; i++)
         Console.WriteLine(foundRows[i][2]);
   }
}
Imports System.Data

Public Class A

   Public Shared Sub Main()
      Dim table As New DataTable("Orders")
      table.Columns.Add("OrderID", GetType(Int32))
      table.Columns.Add("OrderQuantity", GetType(Int32))
      table.Columns.Add("CompanyName", GetType(String))
      table.Columns.Add("Date", GetType(DateTime))

      Dim newRow As DataRow = table.NewRow()
      newRow("OrderID") = 1
      newRow("OrderQuantity") = 3
      newRow("CompanyName") = "NewCompanyName"
      newRow("Date") = "1979, 1, 31"

      ' Add the row to the rows collection.
      table.Rows.Add(newRow)

      Dim newRow2 As DataRow = table.NewRow()
      newRow2("OrderID") = 2
      newRow2("OrderQuantity") = 2
      newRow2("CompanyName") = "NewCompanyName1"
      table.Rows.Add(newRow2)

      Dim newRow3 As DataRow = table.NewRow()
      newRow3("OrderID") = 3
      newRow3("OrderQuantity") = 2
      newRow3("CompanyName") = "NewCompanyName2"
      table.Rows.Add(newRow3)

      ' Presuming the DataTable has a column named Date.
      Dim expression As String = "Date = '1/31/1979' or OrderID = 2"
      ' Dim expression As String = "OrderQuantity = 2 and OrderID = 2"

      ' Sort descending by column named CompanyName.
      Dim sortOrder As String = "CompanyName ASC"
      Dim foundRows As DataRow()

      ' Use the Select method to find all rows matching the filter.
      foundRows = table.[Select](expression, sortOrder)

      ' Print column 0 of each returned row.
      For i As Integer = 0 To foundRows.Length - 1
         Console.WriteLine(foundRows(i)(2))
      Next
   End Sub
End Class

Remarques

Pour former l' filterExpression argument, utilisez les mêmes règles pour la création DataColumn de la Expression valeur de propriété de la classe.To form the filterExpression argument, use the same rules for creating the DataColumn class's Expression property value. L' Sort argument utilise également les mêmes règles pour la création de Expression chaînes de la classe.The Sort argument also uses the same rules for creating class's Expression strings.

Si la colonne sur le filtre contient une valeur null, elle ne fait pas partie du résultat.If the column on the filter contains a null value, it will not be part of the result.

Voir aussi

Select(String, String, DataViewRowState)

Obtient un tableau de tous les objets DataRow qui correspondent au filtre et à l'état spécifié, dans l'ordre de tri.Gets an array of all DataRow objects that match the filter in the order of the sort that match the specified state.

public:
 cli::array <System::Data::DataRow ^> ^ Select(System::String ^ filterExpression, System::String ^ sort, System::Data::DataViewRowState recordStates);
public System.Data.DataRow[] Select (string filterExpression, string sort, System.Data.DataViewRowState recordStates);
member this.Select : string * string * System.Data.DataViewRowState -> System.Data.DataRow[]
Public Function Select (filterExpression As String, sort As String, recordStates As DataViewRowState) As DataRow()

Paramètres

filterExpression
String

Critères à utiliser pour filtrer les lignes.The criteria to use to filter the rows. Pour obtenir des exemples sur la manière de filtrer les lignes, consultez la rubrique relative à la syntaxe DataView RowFilter [C#].For examples on how to filter rows, see DataView RowFilter Syntax [C#].

sort
String

Chaîne spécifiant la colonne et le sens du tri.A string specifying the column and sort direction.

recordStates
DataViewRowState

Une des valeurs de l'objet DataViewRowState.One of the DataViewRowState values.

Retours

Tableau d'objets DataRow.An array of DataRow objects.

Exemples

L’exemple suivant utilise une expression de filtre et un état d’enregistrement pour retourner DataRow un tableau d’objets.The following example uses a filter expression and record state to return an array of DataRow objects.

private static void GetRowsByFilter()
{
    DataTable customerTable = new DataTable("Customers");
    // Add columns
    customerTable.Columns.Add("id", typeof(int));
    customerTable.Columns.Add("name", typeof(string));

    // Set PrimaryKey
    customerTable.Columns[ "id" ].Unique = true;
    customerTable.PrimaryKey = new DataColumn[] 
        { customerTable.Columns["id"] };

    // Add ten rows
    for(int id=1; id<=10; id++)
    {
        customerTable.Rows.Add(
            new object[] { id, string.Format("customer{0}", id) });
    }
    customerTable.AcceptChanges();

    // Add another ten rows
    for(int id=11; id<=20; id++)
    {
        customerTable.Rows.Add(
            new object[] { id, string.Format("customer{0}", id) });
    }

    string expression;
    string sortOrder;

    expression = "id > 5";
    // Sort descending by column named CompanyName.
    sortOrder = "name DESC";
    // Use the Select method to find all rows matching the filter.
    DataRow[] foundRows = 
        customerTable.Select(expression, sortOrder, 
        DataViewRowState.Added);

    PrintRows(foundRows, "filtered rows");

    foundRows = customerTable.Select();
    PrintRows(foundRows, "all rows");
}

private static void PrintRows(DataRow[] rows, string label)
{
    Console.WriteLine("\n{0}", label);
    if(rows.Length <= 0)
    {
        Console.WriteLine("no rows found");
        return;
    }
    foreach(DataRow row in rows)
    {
        foreach(DataColumn column in row.Table.Columns)
        {
            Console.Write("\table {0}", row[column]);
        }
        Console.WriteLine();
    }
}
Private Sub GetRowsByFilter()

    Dim customerTable As New DataTable("Customers")

    ' Add columns
    customerTable.Columns.Add("id", GetType(Integer))
    customerTable.Columns.Add("name", GetType(String))

    ' Set PrimaryKey
    customerTable.Columns("id").Unique = True
    customerTable.PrimaryKey = New DataColumn() _
        {customerTable.Columns("id")}

    ' add ten rows
    Dim id As Integer
    For id = 1 To 10
        customerTable.Rows.Add( _
        New Object() {id, String.Format("customer{0}", id)})
    Next id
    customerTable.AcceptChanges()

    ' add another ten rows
    For id = 11 To 20
        customerTable.Rows.Add( _
        New Object() {id, String.Format("customer{0}", id)})
    Next id

    Dim expression As String
    Dim sortOrder As String

    expression = "id > 5"
    ' Sort descending by CompanyName column.
    sortOrder = "name DESC"

    ' Use the Select method to find all rows matching the filter.
    Dim foundRows As DataRow() = _
        customerTable.Select(expression, sortOrder, _
        DataViewRowState.Added)

    PrintRows(foundRows, "filtered rows")

    foundRows = customerTable.Select()
    PrintRows(foundRows, "all rows")
End Sub

Private Sub PrintRows(ByVal rows() As DataRow, ByVal label As String)
    Console.WriteLine("\n{0}", label)
    If rows.Length <= 0 Then
        Console.WriteLine("no rows found")
        Exit Sub
    End If

    Dim row As DataRow
    Dim column As DataColumn
    For Each row In rows
        For Each column In row.Table.Columns
            Console.Write("\table {0}", row(column))
        Next column
        Console.WriteLine()
    Next row
End Sub

Remarques

Pour former l' filterExpression argument, utilisez les mêmes règles pour la création DataColumn de la Expression valeur de propriété de la classe.To form the filterExpression argument, use the same rules for creating the DataColumn class's Expression property value. L' Sort argument utilise également les mêmes règles pour la création de Expression chaînes de la classe.The Sort argument also uses the same rules for creating class's Expression strings.

Si la colonne sur le filtre contient une valeur null, elle ne fait pas partie du résultat.If the column on the filter contains a null value, it will not be part of the result.

Voir aussi

S’applique à