DataGridSortCommandEventArgs.SortExpression プロパティ

[アーティクル]
06/26/2007

DataGrid コントロールの並べ替えに使用される式を取得します。

名前空間: System.Web.UI.WebControls
アセンブリ: System.Web (system.web.dll 内)

構文

'宣言
Public ReadOnly Property SortExpression As String
'使用
Dim instance As DataGridSortCommandEventArgs
Dim value As String

value = instance.SortExpression

public string SortExpression { get; }

public:
property String^ SortExpression {
    String^ get ();
}

/** @property */
public String get_SortExpression ()

public function get SortExpression () : String

適用できません。

プロパティ値

DataGrid コントロールの並べ替えに使用される式。

解説

SortExpression プロパティを使用して、DataGrid コントロールの並べ替えのためにユーザーが選択した列を確認します。

使用例

SortExpression プロパティを使用して、DataGrid コントロールの並べ替えのためにユーザーが選択した列を確認する方法を次のコード例に示します。

<%@ Page Language="VB" %>
<%@ Import Namespace="System.Data" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    Function CreateDataSource() As ICollection
        ' Create a Random object to mix up the order 
        ' of items in the sample data.
        Dim randNum As Random = New Random()

        ' Create sample data for the DataGrid control.
        Dim dt As DataTable = New DataTable()

        ' Define the columns of the table.
        dt.Columns.Add( _
            New DataColumn("IntegerValue", GetType(Int32)))
        dt.Columns.Add( _
            New DataColumn("StringValue", GetType(String)))
        dt.Columns.Add( _
            New DataColumn("CurrencyValue", GetType(Double)))

        ' Populate the table with sample values.
        Dim i As Integer
        For i = 0 To 8
            Dim dr As DataRow = dt.NewRow()
            dr(0) = i
            dr(1) = "Item " & randNum.Next(1, 15).ToString()
            dr(2) = 1.23 * randNum.Next(1, 15)
            dt.Rows.Add(dr)
        Next

        ' Persist the data source between posts to 
        ' the server, in the session state.  
        Session("Source") = dt

        Dim dv As DataView = New DataView(dt)
        Return dv
    End Function

    Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
        ' Load sample data when the page is first loaded.
        If Not IsPostBack Then
            ItemsGrid.DataSource = CreateDataSource()
            ItemsGrid.DataBind()
        End If
    End Sub

    Sub Sort_Grid(ByVal sender As Object, _
        ByVal e As DataGridSortCommandEventArgs)

        ' Retrieve the data source from session state.
        Dim dt As DataTable = _
            CType(Session("Source"), DataTable)

        ' Create a DataView from the DataTable.
        Dim dv As DataView = New DataView(dt)

        ' The DataView provides an easy way to 
        ' sort. Simply set the Sort property with 
        ' the name of the field to sort by.
        dv.Sort = e.SortExpression

        ' Rebind the data source and specify that 
        ' it should be sorted by the field specified 
        ' in the SortExpression property.
        ItemsGrid.DataSource = dv
        ItemsGrid.DataBind()
    End Sub

    Sub Check_Change(ByVal sender As Object, _
        ByVal e As EventArgs)
        ' Allow or prevent sorting depending 
        ' on the user's selection.
        ItemsGrid.AllowSorting = _
            AllowSortingCheckBox.Checked

        ' After changing the property, rebind 
        ' the data to refresh the DataGrid control.

        ' Retrieve data source from session state.
        Dim dt As DataTable = _
            CType(Session("Source"), DataTable)

        ' Create a DataView from the DataTable.
        Dim dv As DataView = New DataView(dt)

        ' Rebind the data source.
        ItemsGrid.DataSource = dv
        ItemsGrid.DataBind()
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>
        ExtractTemplateRows Example
    </title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <h3>DataGrid AllowSorting Example</h3>

      <p>Select whether to allow sorting in the DataGrid control.<br />
      <asp:CheckBox id="AllowSortingCheckBox"
           Text="Allow sorting"
           AutoPostBack="True"
           Checked="True"
           OnCheckedChanged="Check_Change"
           runat="server"/></p>
      <hr />
 
      <b>Product List</b>
      <asp:DataGrid id="ItemsGrid"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           OnSortCommand="Sort_Grid"
           UseAccessibleHeader="true" 
           AutoGenerateColumns="False"
           AllowSorting="True"
           runat="server">

         <HeaderStyle BackColor="#00aaaa" />
         <Columns>
            <asp:BoundColumn DataField="IntegerValue" 
                 SortExpression="IntegerValue"
                 HeaderText="Item"/>

            <asp:BoundColumn DataField="StringValue"
                 SortExpression="StringValue" 
                 HeaderText="Description"/>

            <asp:BoundColumn DataField="CurrencyValue" 
                 HeaderText="Price"
                 SortExpression="CurrencyValue"
                 DataFormatString="{0:c}">

               <ItemStyle HorizontalAlign="Right">
               </ItemStyle>
            </asp:BoundColumn>
         </Columns> 
      </asp:DataGrid>
 
   </div>
   </form>
</body>
</html>

<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    ICollection CreateDataSource()
    {
        // Create a Random object to mix up the 
        // order of items in the sample data.
        Random randNum = new Random();

        // Create sample data for the DataGrid control.
        DataTable dt = new DataTable();

        // Define the columns of the table.
        dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
        dt.Columns.Add(new DataColumn("StringValue", typeof(String)));
        dt.Columns.Add(new DataColumn("CurrencyValue", typeof(Double)));

        // Populate the table with sample values.
        for (int i = 0; i <= 8; i++)
        {
            DataRow dr = dt.NewRow();
            dr[0] = i;
            dr[1] = "Item " + randNum.Next(1, 15).ToString();
            dr[2] = 1.23 * randNum.Next(1, 15);
            dt.Rows.Add(dr);
        }

        // To persist the data source between posts to the server,
        // store it in session state.  
        Session["Source"] = dt;
        DataView dv = new DataView(dt);
        return dv;
    }

    void Page_Load(Object sender, EventArgs e)
    {
        // Load sample data only once, when the page is first loaded.
        if (!IsPostBack)
        {
            ItemsGrid.DataSource = CreateDataSource();
            ItemsGrid.DataBind();
        }
    }

    void Sort_Grid(Object sender, DataGridSortCommandEventArgs e)
    {
        // Retrieve the data source from session state.
        DataTable dt = (DataTable)Session["Source"];

        // Create a DataView from the DataTable.
        DataView dv = new DataView(dt);

        // The DataView provides an easy way to sort. Simply set the
        // Sort property with the name of the field to sort by.
        dv.Sort = e.SortExpression;

        // Rebind the data source and specify that it should be sorted
        // by the field specified in the SortExpression property.
        ItemsGrid.DataSource = dv;
        ItemsGrid.DataBind();
    }

    void Check_Change(Object sender, EventArgs e)
    {
        // Allow or prevent sorting depending on the user's selection.
        ItemsGrid.AllowSorting = AllowSortingCheckBox.Checked;

        // After changing the property, rebind the data to
        // refresh the DataGrid control.

        // Retrieve the data source from session state.
        DataTable dt = (DataTable)Session["Source"];

        // Create a DataView from the DataTable.
        DataView dv = new DataView(dt);

        // Rebind the data source.
        ItemsGrid.DataSource = dv;
        ItemsGrid.DataBind();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>
        ExtractTemplateRows Example
    </title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <h3>DataGrid AllowSorting Example</h3>

      <p>Select whether to allow sorting in the DataGrid control.<br />
      <asp:CheckBox id="AllowSortingCheckBox"
           Text="Allow sorting"
           AutoPostBack="True"
           Checked="True"
           OnCheckedChanged="Check_Change"
           runat="server"/></p>
      <hr />
 
      <b>Product List</b>
      <asp:DataGrid id="ItemsGrid"
           BorderColor="black"
           BorderWidth="1"
           CellPadding="3"
           OnSortCommand="Sort_Grid"
           UseAccessibleHeader="true"
           AutoGenerateColumns="False"
           AllowSorting="True"
           runat="server">

         <HeaderStyle BackColor="#00aaaa" />
         <Columns>
            <asp:BoundColumn DataField="IntegerValue" 
                 SortExpression="IntegerValue"
                 HeaderText="Item"/>

            <asp:BoundColumn DataField="StringValue"
                 SortExpression="StringValue" 
                 HeaderText="Description"/>

            <asp:BoundColumn DataField="CurrencyValue" 
                 HeaderText="Price"
                 SortExpression="CurrencyValue"
                 DataFormatString="{0:c}">

               <ItemStyle HorizontalAlign="Right">
               </ItemStyle>
            </asp:BoundColumn>
         </Columns> 
      </asp:DataGrid>
 
   </div>
   </form>
</body>
</html>

プラットフォーム

Windows 98,Windows Server 2000 SP4,Windows CE,Windows Millennium Edition,Windows Mobile for Pocket PC,Windows Mobile for Smartphone,Windows Server 2003,Windows XP Media Center Edition,Windows XP Professional x64 Edition,Windows XP SP2,Windows XP Starter Edition

Microsoft .NET Framework 3.0 は Windows Vista,Microsoft Windows XP SP2,および Windows Server 2003 SP1 でサポートされています。

バージョン情報

.NET Framework

サポート対象 : 3.0,2.0,1.1,1.0

次の方法で共有

DataGridSortCommandEventArgs.SortExpression プロパティ

構文

プロパティ値

解説

使用例

プラットフォーム

バージョン情報

.NET Framework

参照

関連項目

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