.NET Framework 类库  

DataGrid.Columns 属性

请参见

DataGrid 类 | DataGrid 成员 | System.Web.UI.WebControls 命名空间 | DataGridColumn | BoundColumn | ButtonColumn | EditCommandColumn | HyperLinkColumn | TemplateColumn | DataGrid 成员（Visual J# 语法） | C++ 托管扩展编程

要求

平台: Windows 2000, Windows XP Professional, Windows Server 2003 系列

语言

  • C#
  • C++
  • JScript
  • Visual Basic
  • 全部显示

获取表示 DataGrid 控件的各列的对象的集合。

[Visual Basic]
Public Overridable ReadOnly Property  As _DataGridColumnCollection
[C#]
public virtual   {get;}
[C++]
public: __property virtual * get_();
[JScript]
public function get () : ;

属性值

一个 DataGridColumnCollection 对象，该对象包含表示 DataGrid 控件中各列的对象的集合。

备注

使用此属性以编程的方式控制 DataGrid 控件中各列的集合。Columns 集合包含 DataGrid 控件中呈现的显式声明的列。

注意   显式声明的列可与自动生成的列一起使用。当同时使用这二者时，首先呈现的是显式声明的列，其后是自动生成的列。自动生成的列不会添加到 Columns 集合中。

列在 DataGrid 控件中显示的顺序由列在 Columns 集合中出现的顺序控制。

下表显示从 DataGridColumn 类导出并且可在 Columns 集合中使用的不同列类。

列类型 描述
BoundColumn 显示绑定到数据源中的字段的列。它以文本形式显示字段中的每个项。这是 DataGrid 控件的默认列类型。
ButtonColumn 为列中每个项显示一个命令按钮。这使您可以创建一列自定义按钮控件，如 Add 按钮或 Remove 按钮。
EditCommandColumn 显示一列，该列包含列中各个项的编辑命令。
HyperLinkColumn 将列中各项的内容显示为超级链接。列的内容可以绑定到数据源或静态文本中的字段。
TemplateColumn 按照指定的模板显示列中的各项。这使您可以在列中提供自定义控件。

注意   尽管您可以编程的方式将列添加到 Columns 集合，但静态地列出相应列然后使用 Visible 属性显示或隐藏列更容易一些。

示例

[Visual Basic, C#, JScript] 下面的示例展示如何使用 Columns 集合动态向 DataGrid 控件添加列。

[Visual Basic]
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %><html><script language="VB" runat="server">Dim Cart As DataTableDim CartView As DataViewFunction CreateDataSource() As ICollectionDim dt As New DataTable()Dim dr As DataRowdt.(New DataColumn("IntegerValue", GetType(Int32)))dt.(New DataColumn("StringValue", GetType(String)))dt.(New DataColumn("CurrencyValue", GetType(Double)))Dim i As IntegerFor i = 0 To 8dr = dt.NewRow()dr(0) = idr(1) = "Item " & i.ToString()dr(2) = 1.23 *(i + 1)dt.Rows.(dr)Next iDim dv As New DataView(dt)Return dvEnd Function 'CreateDataSourceSub Page_Load(sender As Object, e As EventArgs)If Session("DG4_ShoppingCart") Is Nothing ThenCart = New DataTable()Cart.(New DataColumn("Item", GetType(String)))Cart.(New DataColumn("Price", GetType(String)))Session("DG4_ShoppingCart") = CartElseCart = CType(Session("DG4_ShoppingCart"), DataTable)End IfCartView = New DataView(Cart)ShoppingCart.DataSource = CartViewShoppingCart.DataBind()If Not IsPostBack Then' Load this data only once.ItemsGrid.DataSource = CreateDataSource()ItemsGrid.DataBind()End IfEnd Sub 'Page_LoadSub Page_Init(sender As Object, e As EventArgs)' Create a dynamic column to  to  collection.Dim NumberColumn As New BoundColumn()NumberColumn.HeaderText = "Item Number"NumberColumn.DataField = "IntegerValue"'  column to  collection.ItemsGrid..AddAt(2, NumberColumn)End Sub 'Page_InitSub Grid_CartCommand(sender As Object, e As DataGridCommandEventArgs)Dim dr As DataRow = Cart.NewRow()' e.Item is the table row where the command is raised.' For bound , the value is stored in the Text property of the TableCell.Dim itemCell As TableCell = e.Item.Cells(2)Dim priceCell As TableCell = e.Item.Cells(3)Dim item As String = itemCell.TextDim price As String = priceCell.TextIf CType(e.CommandSource, Button).CommandName = "AddToCart" Thendr(0) = itemdr(1) = priceCart.Rows.(dr)Else 'Remove from Cart.CartView.RowFilter = "Item='" & item & "'"If CartView.Count > 0 ThenCartView.Delete(0)End IfCartView.RowFilter = ""End IfShoppingCart.DataBind()End Sub 'Grid_CartCommand </script><body><form runat=server><h3>DataGrid  Example</h3><table cellpadding="5"><tr valign="top"><td><b>Product List</b><asp:DataGrid id="ItemsGrid"BorderColor="black"BorderWidth="1"CellPadding="3"AutoGenerateColumns="false"OnItemCommand="Grid_CartCommand"runat="server"><HeaderStyle BackColor="#00aaaa"></HeaderStyle><><asp:ButtonColumn HeaderText=" to cart" ButtonType="PushButton" Text="" CommandName="AddToCart"/><asp:ButtonColumn HeaderText="Remove from cart" ButtonType="PushButton" Text="Remove" CommandName="RemoveFromCart"/><asp:BoundColumn HeaderText="Item" DataField="StringValue"/><asp:BoundColumn HeaderText="Price" DataField="CurrencyValue" DataFormatString="{0:c}"><ItemStyle HorizontalAlign="right"></ItemStyle></asp:BoundColumn></></asp:DataGrid></td><td><b>Shopping Cart</b><asp:DataGrid id="ShoppingCart" runat="server"BorderColor="black"BorderWidth="1"GridLines="Both"ShowFooter="false"CellPadding="3"CellSpacing="0"><HeaderStyle BackColor="#00aaaa"></HeaderStyle></asp:DataGrid></td></tr></table></form></body>
</html>
[C#]
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %><html><script language="C#" runat="server">DataTable Cart;DataView CartView;ICollection CreateDataSource() {DataTable dt = new DataTable();DataRow dr;dt.(new DataColumn("IntegerValue", typeof(Int32)));dt.(new DataColumn("StringValue", typeof(string)));dt.(new DataColumn("CurrencyValue", typeof(double)));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.(dr);}DataView dv = new DataView(dt);return dv;} void Page_Load(Object sender, EventArgs e) {if (Session["DG4_ShoppingCart"] == null) {Cart = new DataTable();Cart.(new DataColumn("Item", typeof(string)));Cart.(new DataColumn("Price", typeof(string)));Session["DG4_ShoppingCart"] = Cart;}else {Cart = (DataTable)Session["DG4_ShoppingCart"];}    CartView = new DataView(Cart);ShoppingCart.DataSource = CartView;ShoppingCart.DataBind();if (!IsPostBack) {// Load this data only once.ItemsGrid.DataSource= CreateDataSource();ItemsGrid.DataBind();}}void Page_Init(Object sender, EventArgs e) {// Create a dynamic column to  to  collection.BoundColumn NumberColumn = new BoundColumn();NumberColumn.HeaderText="Item Number"; NumberColumn.DataField="IntegerValue";//  column to  collection.ItemsGrid..AddAt(2, NumberColumn);}void Grid_CartCommand(Object sender, DataGridCommandEventArgs e) {DataRow dr = Cart.NewRow();// e.Item is the table row where the command is raised.// For bound , the value is stored in the Text property of the TableCell.TableCell itemCell = e.Item.Cells[2];TableCell priceCell = e.Item.Cells[3];string item = itemCell.Text;string price = priceCell.Text;if (((Button)e.CommandSource).CommandName == "AddToCart") {dr[0] = item;dr[1] = price;Cart.Rows.(dr);}else { //Remove from Cart.CartView.RowFilter = "Item='" + item + "'";if (CartView.Count > 0) {    CartView.Delete(0);}CartView.RowFilter = "";}ShoppingCart.DataBind();}</script><body><form runat=server><h3>DataGrid  Example</h3><table cellpadding="5"><tr valign="top"><td><b>Product List</b><asp:DataGrid id="ItemsGrid"BorderColor="black"BorderWidth="1"CellPadding="3"AutoGenerateColumns="false"OnItemCommand="Grid_CartCommand"runat="server"><HeaderStyle BackColor="#00aaaa"></HeaderStyle><><asp:ButtonColumn HeaderText=" to cart" ButtonType="PushButton" Text="" CommandName="AddToCart"/><asp:ButtonColumn HeaderText="Remove from cart" ButtonType="PushButton" Text="Remove" CommandName="RemoveFromCart"/><asp:BoundColumn HeaderText="Item" DataField="StringValue"/><asp:BoundColumn HeaderText="Price" DataField="CurrencyValue" DataFormatString="{0:c}"><ItemStyle HorizontalAlign="right"></ItemStyle></asp:BoundColumn></></asp:DataGrid></td><td><b>Shopping Cart</b><asp:DataGrid id="ShoppingCart" runat="server"BorderColor="black"BorderWidth="1"GridLines="Both"ShowFooter="false"CellPadding="3"CellSpacing="0"><HeaderStyle BackColor="#00aaaa"></HeaderStyle></asp:DataGrid></td></tr></table></form></body>
</html>
[JScript]
<%@ Page Language="JScript" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %><html><script language="JScript" runat="server">var Cart : DataTable = new DataTable();var CartView : DataView;   function CreateDataSource() : ICollection{var dt : DataTable = new DataTable();var dr : DataRow;dt.(new DataColumn("IntegerValue", Int32));dt.(new DataColumn("StringValue", System.String));dt.(new DataColumn("CurrencyValue", double));for (var i : int = 0; i < 9; i++) {dr = dt.NewRow();dr[0] = i;dr[1] = "Item " + i.ToString();dr[2] = 1.23 * (i + 1);dt.Rows.(dr);}var dv : DataView = new DataView(dt);return dv;} function Page_Load(sender, e : EventArgs) {if (Session["DG4_ShoppingCart"] == null) {Cart = new DataTable();Cart.(new DataColumn("Item", System.String));Cart.(new DataColumn("Price", System.String));Session["DG4_ShoppingCart"] = Cart;}else {Cart = DataTable(Session["DG4_ShoppingCart"]);}    CartView = new DataView(Cart);ShoppingCart.DataSource = CartView;ShoppingCart.DataBind();if (!IsPostBack) {// Load this data only once.ItemsGrid.DataSource= CreateDataSource();ItemsGrid.DataBind();}}function Page_Init(sender, e : EventArgs) {// Create a dynamic column to  to  collection.var NumberColumn : BoundColumn = new BoundColumn();NumberColumn.HeaderText="Item Number"; NumberColumn.DataField="IntegerValue";//  column to  collection.ItemsGrid..AddAt(2, NumberColumn);}function Grid_CartCommand(sender, e : DataGridCommandEventArgs) {var dr : DataRow = Cart.NewRow();// e.Item is the table row where the command is raised.// For bound , the value is stored in the Text property of the TableCell.var itemCell : TableCell = e.Item.Cells[2];var priceCell : TableCell = e.Item.Cells[3];var item : String = itemCell.Text;var price : String = priceCell.Text;if ((Button(e.CommandSource)).CommandName == "AddToCart") {dr[0] = item;dr[1] = price;Cart.Rows.(dr);}else { //Remove from Cart.CartView.RowFilter = "Item='" + item + "'";if (CartView.Count > 0) {    CartView.Delete(0);}CartView.RowFilter = "";}ShoppingCart.DataBind();}</script><body><form runat=server><h3>DataGrid  Example</h3><table cellpadding="5"><tr valign="top"><td><b>Product List</b><asp:DataGrid id="ItemsGrid"BorderColor="black"BorderWidth="1"CellPadding="3"AutoGenerateColumns="false"OnItemCommand="Grid_CartCommand"runat="server"><HeaderStyle BackColor="#00aaaa"></HeaderStyle><><asp:ButtonColumn HeaderText=" to cart" ButtonType="PushButton" Text="" CommandName="AddToCart"/><asp:ButtonColumn HeaderText="Remove from cart" ButtonType="PushButton" Text="Remove" CommandName="RemoveFromCart"/><asp:BoundColumn HeaderText="Item" DataField="StringValue"/><asp:BoundColumn HeaderText="Price" DataField="CurrencyValue" DataFormatString="{0:c}"><ItemStyle HorizontalAlign="right"></ItemStyle></asp:BoundColumn></></asp:DataGrid></td><td><b>Shopping Cart</b><asp:DataGrid id="ShoppingCart" runat="server"BorderColor="black"BorderWidth="1"GridLines="Both"ShowFooter="false"CellPadding="3"CellSpacing="0"><HeaderStyle BackColor="#00aaaa"></HeaderStyle></asp:DataGrid></td></tr></table></form></body>
</html>
[Visual Basic] <%@ 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  of the table.dt.(New DataColumn("IntegerValue", GetType(Int32)))dt.(New DataColumn("StringValue", GetType(string)))dt.(New DataColumn("CurrencyValue", GetType(double)))' Populate the table with sample values.Dim i As IntegerFor i = 0 to 4 dr = dt.NewRow()dr(0) = idr(1) = "Item " & i.ToString()dr(2) = 1.23 * (i + 1)dt.Rows.(dr)Next iDim dv As DataView = New DataView(dt)Return dvEnd FunctionSub Page_Load(sender As Object, e As EventArgs) ' Load sample data only once, when the page is first loaded.If Not IsPostBack Then ItemsGrid.DataSource = CreateDataSource()ItemsGrid.DataBind()End IfEnd SubSub Button_Click(sender As Object, e As EventArgs) ' Count the number of selected items in the DataGrid control.Dim count As Integer = 0' Display the selected times.Message.Text = "You Selected: <br>"' Iterate through each item (row) in the DataGrid control and' determine whether it is selected.Dim item As DataGridItemFor Each item In ItemsGrid.ItemsDetermineSelection(item, count)        Next' If no items are selected, display the appropriate message.If count = 0 ThenMessage.Text = "No items selected"End IfEnd SubSub DetermineSelection(item As DataGridItem, ByRef count As Integer)' Retrieve the SelectCheckBox CheckBox control from the ' specified item (row) in the DataGrid control.Dim selection As CheckBox = _CType(item.FindControl("SelectCheckBox"), CheckBox)' If the item is selected, display the appropriate message and' increment the count of selected items.If Not selection Is Nothing ThenIf selection.Checked ThenMessage.Text &= "- " & item.Cells(1).Text & "<br>"count = count + 1End IfEnd If    End SubSub Check_Change(sender As Object, e As EventArgs)' Show or hide the first column depending on the value of' the check box.If ShowCheckBox.Checked ThenItemsGrid.(0).Visible = TrueElseItemsGrid.(0).Visible = FalseEnd IfEnd Sub</script><body><form runat=server><h3>DataGridColumn Visible Example</h3>Select whether to show or hide the first column.<br><br><b>Product List</b><asp:DataGrid id="ItemsGrid"BorderColor="black"BorderWidth="1"CellPadding="3"ShowFooter="True"AutoGenerateColumns="False"runat="server"><HeaderStyle BackColor="#00aaaa"></HeaderStyle><FooterStyle BackColor="#00aaaa"></FooterStyle><><asp:BoundColumn DataField="IntegerValue"Visible="True" HeaderText="Item"/><asp:BoundColumn DataField="StringValue"Visible="True"  HeaderText="Description"/><asp:BoundColumn DataField="CurrencyValue"Visible="True"  HeaderText="Price"DataFormatString="{0:c}"><ItemStyle HorizontalAlign="Right"></ItemStyle></asp:BoundColumn><asp:TemplateColumn HeaderText="Select Item"Visible="True" ><ItemTemplate><asp:CheckBox id="SelectCheckBox"Text=" to Cart"Checked="False"runat="server"/></ItemTemplate></asp:TemplateColumn></> </asp:DataGrid><br><br><asp:Button id="SubmitButton"Text="Submit"OnClick = "Button_Click"runat="server"/><br><br><asp:Label id="Message"runat="server"/><hr><asp:CheckBox id="ShowCheckBox"Text="Show first column"AutoPostBack="True"OnCheckedChanged="Check_Change"Checked="True"runat="server"/></form></body>
</html>
[C#] <%@ 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  of the table.dt.(new DataColumn("IntegerValue", typeof(Int32)));dt.(new DataColumn("StringValue", typeof(string)));dt.(new DataColumn("CurrencyValue", typeof(double)));// Populate the table with sample values.for (int i = 0; i < 5; i++) {dr = dt.NewRow();dr[0] = i;dr[1] = "Item " + i.ToString();dr[2] = 1.23 * (i + 1);dt.Rows.(dr);}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 Button_Click(Object sender, EventArgs e) {// Count the number of selected items in the DataGrid control.int count = 0;// Display the selected times.Message.Text = "You Selected: <br>";// Iterate through each item (row) in the DataGrid control and// determine whether it is selected.foreach (DataGridItem item in ItemsGrid.Items){DetermineSelection(item, ref count);        }// If no items are selected, display the appropriate message.if (count == 0){Message.Text = "No items selected";}}void DetermineSelection(DataGridItem item, ref int count){// Retrieve the SelectCheckBox CheckBox control from the // specified item (row) in the DataGrid control.CheckBox selection = (CheckBox)item.FindControl("SelectCheckBox");// If the item is selected, display the appropriate message and// increment the count of selected items.if (selection != null){if (selection.Checked){Message.Text += "- " + item.Cells[1].Text + "<br>";count++;}}    }void Check_Change(Object sender, EventArgs e){// Show or hide the first column depending on the value of// the check box.if (ShowCheckBox.Checked){ItemsGrid.[0].Visible = true;}else{ItemsGrid.[0].Visible = false;}}</script><body><form runat=server><h3>DataGridColumn Visible Example</h3>Select whether to show or hide the first column.<br><br><b>Product List</b><asp:DataGrid id="ItemsGrid"BorderColor="black"BorderWidth="1"CellPadding="3"ShowFooter="True"AutoGenerateColumns="False"runat="server"><HeaderStyle BackColor="#00aaaa"></HeaderStyle><FooterStyle BackColor="#00aaaa"></FooterStyle><><asp:BoundColumn DataField="IntegerValue"Visible="True" HeaderText="Item"/><asp:BoundColumn DataField="StringValue"Visible="True"  HeaderText="Description"/><asp:BoundColumn DataField="CurrencyValue"Visible="True"  HeaderText="Price"DataFormatString="{0:c}"><ItemStyle HorizontalAlign="Right"></ItemStyle></asp:BoundColumn><asp:TemplateColumn HeaderText="Select Item"Visible="True" ><ItemTemplate><asp:CheckBox id="SelectCheckBox"Text=" to Cart"Checked="False"runat="server"/></ItemTemplate></asp:TemplateColumn></>  </asp:DataGrid><br><br><asp:Button id="SubmitButton"Text="Submit"OnClick = "Button_Click"runat="server"/><br><br><asp:Label id="Message"runat="server"/><hr><asp:CheckBox id="ShowCheckBox"Text="Show first column"AutoPostBack="True"OnCheckedChanged="Check_Change"Checked="True"runat="server"/></form></body>
</html>

[C++] 没有可用于 C++ 的示例。若要查看 Visual Basic、C# 或 JScript 示例，请单击页左上角的“语言筛选器”按钮 。

要求

平台: Windows 2000, Windows XP Professional, Windows Server 2003 系列

请参见

DataGrid 类 | DataGrid 成员 | System.Web.UI.WebControls 命名空间 | DataGridColumn | BoundColumn | ButtonColumn | EditCommandColumn | HyperLinkColumn | TemplateColumn | DataGrid 成员（Visual J# 语法） | C++ 托管扩展编程

发送有关此主题的意见

转载于:https://www.cnblogs.com/T_98Dsky/archive/2005/04/22/143470.html

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