DataGrid コンストラクタとは何？わかりやすく解説 Weblio辞書

<%@ Page Language="VB" AutoEventWireup="True"
 %>
<%@ Import Namespace="System.Data"
 %>
 
<html>
   <script runat="server">

      Function CreateDataSource() As ICollection
 
      
         ' Create sample data for the DataGrid control.
         Dim dt As DataTable = New
 DataTable()
         Dim dr As DataRow
 
         ' 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 
        
            dr = dt.NewRow()
 
            dr(0) = i
            dr(1) = "Item " & i.ToString()
            dr(2) = 1.23 * (i + 1)
 
            dt.Rows.Add(dr)

         Next i
 
         Dim dv As DataView = New
 DataView(dt)
         Return dv

      End Function
 
      Sub Page_Load(sender As Object,
 e As EventArgs) 

         ' Create a DataGrid control.
         Dim ItemsGrid As DataGrid = New
 DataGrid()

         ' Set the properties of the DataGrid.
         ItemsGrid.ID = "ItemsGrid"
         ItemsGrid.BorderColor = System.Drawing.Color.Black
         ItemsGrid.CellPadding = 3
         ItemsGrid.AutoGenerateColumns = False

         ' Set the styles for the DataGrid.
         ItemsGrid.HeaderStyle.BackColor = System.Drawing.Color.FromArgb(&H0000aaaa)

         ' Create the columns for the DataGrid control. The DataGrid
         ' columns are dynamically generated. Therefore, the columns
   
         ' must be re-created each time the page is refreshed.
         
         ' Create and add the columns to the collection.
         ItemsGrid.Columns.Add(CreateBoundColumn("IntegerValue",
 "Item"))
         ItemsGrid.Columns.Add( _
             CreateBoundColumn("StringValue", "Description"))
         ItemsGrid.Columns.Add( _
             CreateBoundColumn("CurrencyValue", "Price",
 "{0:c}", _
             HorizontalAlign.Right))
         ItemsGrid.Columns.Add( _
             CreateLinkColumn("http:'www.microsoft.com", "_self",
 _
             "Microsoft", "Related
 link"))
        
         ' Specify the data source and bind it to the control.     
         ItemsGrid.DataSource = CreateDataSource()
         ItemsGrid.DataBind()

         ' Add the DataGrid control to the Controls collection of 
         ' the PlaceHolder control.
         Place.Controls.Add(ItemsGrid)

      End Sub

      Function CreateBoundColumn(DataFieldValue As
 String, HeaderTextValue As String)
 As BoundColumn

         ' This version of CreateBoundColumn method sets only the 
         ' DataField and HeaderText properties.

         ' Create a BoundColumn.
         Dim column As BoundColumn = New
 BoundColumn()

         ' Set the properties of the BoundColumn.
         column.DataField = DataFieldValue
         column.HeaderText = HeaderTextValue

         Return column

      End Function

      Function CreateBoundColumn(DataFieldValue As
 String, _
          HeaderTextValue As String, FormatValue
 As String, _
          AlignValue As HorizontalAlign) As
 BoundColumn

         ' This version of CreateBoundColumn method sets the DataField
,
         ' HeaderText, and DataFormatString properties. It also sets
 the 
         ' HorizontalAlign property of the ItemStyle property of the
 column. 

         ' Create a BoundColumn using the overloaded CreateBoundColumn
 method.
         Dim column As BoundColumn = CreateBoundColumn(DataFieldValue,
 HeaderTextValue)

         ' Set the properties of the BoundColumn.
         column.DataFormatString = FormatValue
         column.ItemStyle.HorizontalAlign = AlignValue

         Return column

      End Function

      Function CreateLinkColumn(NavUrlValue As
 String, TargetValue As String,
 _
         TextValue As String, HeaderTextValue
 As String) As HyperLinkColumn
 

         ' Create a BoundColumn.
         Dim column As HyperLinkColumn = New
 HyperLinkColumn()

         ' Set the properties of the ButtonColumn.
         column.NavigateUrl = NavUrlValue
         column.Target = TargetValue
         column.Text = TextValue
         column.HeaderText = HeaderTextValue

         Return column

      End Function

   </script>
 
<body>
 
   <form runat=server>
 
      <h3>DataGrid Constructor Example</h3>
 
      <b>Product List</b>

      <asp:PlaceHolder id="Place"
           runat="server"/>
 
   </form>
 
</body>
</html>

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

      ICollection CreateDataSource() 
      {
      
         // Create sample data for the DataGrid control.
         DataTable dt = new DataTable();
         DataRow dr;
 
         // 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 < 9; i++) 
         {
            dr = dt.NewRow();
 
            dr[0] = i;
            dr[1] = "Item " + i.ToString();
            dr[2] = 1.23 * (i + 1);
 
            dt.Rows.Add(dr);
         }
 
         DataView dv = new DataView(dt);
         return dv;

      }
 
      void Page_Load(Object sender, EventArgs e) 
      {

         // Create a DataGrid control.
         DataGrid ItemsGrid = new DataGrid();

         // Set the properties of the DataGrid.
         ItemsGrid.ID = "ItemsGrid";
         ItemsGrid.BorderColor = System.Drawing.Color.Black;
         ItemsGrid.CellPadding = 3;
         ItemsGrid.AutoGenerateColumns = false;

         // Set the styles for the DataGrid.
         ItemsGrid.HeaderStyle.BackColor = 
             System.Drawing.Color.FromArgb(0x0000aaaa);

         // Create the columns for the DataGrid control. The DataGrid
         // columns are dynamically generated. Therefore, the columns
   
         // must be re-created each time the page is refreshed.
         
         // Create and add the columns to the collection.
         ItemsGrid.Columns.Add(CreateBoundColumn("IntegerValue", "Item"));
         ItemsGrid.Columns.Add(
             CreateBoundColumn("StringValue", "Description"));
         ItemsGrid.Columns.Add(
             CreateBoundColumn("CurrencyValue", "Price", "{0:c}",
 
             HorizontalAlign.Right));
         ItemsGrid.Columns.Add(
             CreateLinkColumn("http://www.microsoft.com",
 "_self", 
             "Microsoft", "Related link"));
        
         // Specify the data source and bind it to the control.
         ItemsGrid.DataSource = CreateDataSource();
         ItemsGrid.DataBind();

         // Add the DataGrid control to the Controls collection of 
         // the PlaceHolder control.
         Place.Controls.Add(ItemsGrid);

      }

      BoundColumn CreateBoundColumn(String DataFieldValue, 
          String HeaderTextValue)
      {

         // This version of the CreateBoundColumn method sets only the
         // DataField and HeaderText properties.

         // Create a BoundColumn.
         BoundColumn column = new BoundColumn();

         // Set the properties of the BoundColumn.
         column.DataField = DataFieldValue;
         column.HeaderText = HeaderTextValue;

         return column;

      }

      BoundColumn CreateBoundColumn(String DataFieldValue, 
          String HeaderTextValue, String FormatValue, 
          HorizontalAlign AlignValue)
      {

         // This version of CreateBoundColumn method sets the DataField
,
         // HeaderText, and DataFormatString properties. It also sets
 the 
         // HorizontalAlign property of the ItemStyle property of the
 column. 

         // Create a BoundColumn using the overloaded CreateBoundColumn
 method.
         BoundColumn column = CreateBoundColumn(DataFieldValue, HeaderTextValue);

         // Set the properties of the BoundColumn.
         column.DataFormatString = FormatValue;
         column.ItemStyle.HorizontalAlign = AlignValue;

         return column;

      }

      HyperLinkColumn CreateLinkColumn(String NavUrlValue, 
          String TargetValue, String TextValue, String HeaderTextValue)
      {

         // Create a BoundColumn.
         HyperLinkColumn column = new HyperLinkColumn();

         // Set the properties of the ButtonColumn.
         column.NavigateUrl = NavUrlValue;
         column.Target = TargetValue;
         column.Text = TextValue;
         column.HeaderText = HeaderTextValue;

         return column;

      }

   </script>
 
<body>
 
   <form runat=server>
 
      <h3>DataGrid Constructor Example</h3>
 
      <b>Product List</b>

      <asp:PlaceHolder id="Place"
           runat="server"/>
 
   </form>
 
</body>
</html>

プラットフォーム

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
DataGrid クラス
DataGrid メンバ
System.Web.UI.WebControls 名前空間

DataGrid コンストラクタ

System.Windows.Forms.DataGrid クラスの新しいインスタンスを初期化します。

名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文

Visual Basic (宣言)

Public Sub New

Visual Basic (使用法)

Dim instance As New DataGrid

public DataGrid ()

C++

public:
DataGrid ()

public DataGrid ()

JScript

public function DataGrid ()

解説

新しく作成した System.Windows.Forms.DataGrid コントロールを読み込むには、DataSource プロパティをDataView、DataSet、DataViewManager などの有効なソースに設定します。

使用例

新しい System.Windows.Forms.DataGrid を作成し、SetDataBinding メソッドを使用して DataSource プロパティと DataMember プロパティを設定するコード例を次に示します。

Visual Basic

' This object variable must go in the Declarations section:
Private DataGrid1 As DataGrid
 
Private Sub CreateDataGrid()
   ' Initialize a new DataGrid control.
   me.Datagrid1 = New DataGrid
   
   Dim myDataSet As DataSet = New
 DataSet("myDataSet")
   Dim myDataTable As DataTable = New
 DataTable("Customers")
   myDataSet.Tables.Add(myDataTable)
   ' Insert code to populate the DataTable with rows.
   ' Set the DataSource and DataMember of the DataGrid control.
   DataGrid1.SetDataBinding(myDataSet, "Customers")
End Sub