DataGridColumnCollection.Add(DataGridColumn) 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
將指定之 DataGridColumn 衍生資料行物件附加至 DataGridColumnCollection 集合的結尾。
public:
void Add(System::Web::UI::WebControls::DataGridColumn ^ column);public void Add (System.Web.UI.WebControls.DataGridColumn column);member this.Add : System.Web.UI.WebControls.DataGridColumn -> unitPublic Sub Add (column As DataGridColumn)參數
- column
- DataGridColumn
要附加至 DataGridColumn 的 DataGridColumnCollection 衍生資料行物件。
範例
下列程式碼範例示範如何使用 Add 方法，將資料行動態新增至 DataGrid 控制項。 請注意， Columns 控制項的 DataGrid 屬性是 類別的 DataGridColumnCollection 實例。
<%@ 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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<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>
<head runat="server">
<title>DataGrid Constructor Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGrid Constructor Example</h3>
<b>Product List</b>
<asp:PlaceHolder id="Place"
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="VB" 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">
<html xmlns="http://www.w3.org/1999/xhtml" >
<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>
<head runat="server">
<title>DataGrid Constructor Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataGrid Constructor Example</h3>
<b>Product List</b>
<asp:PlaceHolder id="Place"
runat="server"/>
</form>
</body>
</html>
備註
使用這個方法可將衍生的資料行物件加入 DataGridColumn 集合結尾 DataGridColumnCollection 。
控制項 DataGrid 不會將其集合的內容 Columns 儲存在檢視狀態中。 若要動態新增或移除資料行，您必須在每次重新整理頁面時，以程式設計方式新增或移除資料行。 提供函 Page_Init 式，在控制項可以重載其狀態並重建其本身之前 DataGrid ，新增或移除資料行。 否則，當集合顯示時，集合的 Columns DataGrid 變更不會反映在 控制項中。