后台动态生成GridView列和模版

考虑到很多数据源是不确定的，所以这时无法在前台设置gridview的表头，需要在后台动态指定并绑定数据。

前台代码如下：

<%@ Page Title="主页" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeFile="Default.aspx.cs" Inherits="_Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<div>
    <asp:GridView ID="GridView1" runat="server">
    </asp:GridView>
</div>
</asp:Content>

.cs页面代码如下：

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        BindData();
    }

/// <summary>
/// 绑定gridview
/// </summary>
    public void BindData()
    {
        string sqlcc = "SELECT * from Users";//order by gwbg.id desc
        DataTable dt = new DataTable();
        dt = DBHelp.ExecuteQueryWithoutParameter(sqlcc, CommandType.Text);
        GridView1.AutoGenerateColumns = false;//设置自动产生列为false
        GridView1.RowEditing += new GridViewEditEventHandler(GridView1_RowEditing); //添加编辑事件
        GridView1.RowDeleting += new GridViewDeleteEventHandler(GridView1_RowDeleting);//添加删除事件
        GridView1.RowCancelingEdit += new GridViewCancelEditEventHandler(GridView1_RowCancelingEdit);//添加删除事件
        GridViewBind(GridView1, dt, "Id");
    }

    /// <summary>
    /// 绑定生成GridView
    /// </summary>
    /// <param name="gdv">要绑定的GridView</param>
    /// <param name="dtblDataSource">GridView的数据源</param>
    /// <param name="strDataKey">GridView的DataKeyNames</param>
    public static void GridViewBind(GridView gdv, DataTable dtblDataSource, string strDataKey)
    {
        gdv.Columns.Clear();

        gdv.AutoGenerateColumns = false;
        gdv.DataSource = dtblDataSource;
        gdv.DataKeyNames = new string[]{ strDataKey };

        for (int i = 0; i < dtblDataSource.Columns.Count; i++)   //绑定普通数据列
        {
            BoundField bfColumn = new BoundField();
            bfColumn.DataField = dtblDataSource.Columns[i].ColumnName;
            bfColumn.HeaderText = dtblDataSource.Columns[i].Caption;
            gdv.Columns.Add(bfColumn);
        }

        //添加编辑列
        CommandField cf = new CommandField();//命令字段
        cf.ButtonType = ButtonType.Link;//超链接样式的按钮
        cf.ShowEditButton = true;//显示编辑按钮
        cf.CausesValidation = false;//引发数据验证为false
        cf.HeaderText = "编辑";
        cf.ItemStyle.HorizontalAlign = HorizontalAlign.Center;
        gdv.Columns.Add(cf);//添加编辑按钮到gridview

        //添加删除列
        CommandField cf2 = new CommandField();
        cf2.ButtonType = ButtonType.Link;
        cf2.ShowDeleteButton = true;//显示删除按钮
        cf2.CausesValidation = false;
        cf2.HeaderText = "删除";
        cf2.ItemStyle.HorizontalAlign = HorizontalAlign.Center;
        gdv.Columns.Add(cf2);

        //添加包复选框的模板列
        TemplateField tf = new TemplateField();
        tf.ItemTemplate = new MyTemplate("", DataControlRowType.DataRow);
        //tf.HeaderText = "选择";
        tf.HeaderTemplate = new MyTemplate("模版列-选择框", DataControlRowType.Header);
        tf.ItemStyle.HorizontalAlign = HorizontalAlign.Center;
        gdv.Columns.Add(tf);

        gdv.DataBind();//绑定


    }

    //删除gridview的行
    void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        int i = e.RowIndex;
        MessageBox.Show(this, "删除ID为："+GridView1.Rows[i].Cells [0].Text.ToString () );
    }

    //编辑行
    public void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
    {
        int i = e.NewEditIndex;
        string id = GridView1.Rows[i].Cells[0].Text.ToString();
        MessageBox.Show(this, "删除ID为：" + id);
    }

    //取消
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        GridView1.EditIndex = -1;
        BindData();
    }


}

其中，添加模版的MyTemplate类代码为：

public class MyTemplate : ITemplate
{
    private string strColumnName;
    private DataControlRowType dcrtColumnType;

    public MyTemplate()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    /// <summary>
    /// 动态添加模版列
    /// </summary>
    /// <param name="strColumnName">列名</param>
    /// <param name="dcrtColumnType">列的类型</param>
    public MyTemplate(string strColumnName, DataControlRowType dcrtColumnType)
    {
        this.strColumnName = strColumnName;
        this.dcrtColumnType = dcrtColumnType;
    }

    public void InstantiateIn(Control ctlContainer)
    {
        switch (dcrtColumnType)
        {
            case DataControlRowType.Header: //列标题

                //如果头部使用标题则使用以下代码
                Literal ltr = new Literal();
                ltr.Text = strColumnName;
                ctlContainer.Controls.Add(ltr);
                break;
            case DataControlRowType.DataRow: //模版列内容——加载CheckBox
                CheckBox cb = new CheckBox();
                cb.ID = "CheckBox1";
                cb.Checked = false;
                ctlContainer.Controls.Add(cb);
                break;
        }
    }

}

在MyTemplate类中，这里是直接写了添加CheckBox，其实我们可以在MyTemplate的构造函数里添加一个参数，表示传进来的要在模版里面添加的控件的类型。这样就可以根据

控件类型来自动生成控件了，而不要在类里面去手动写需要生成的控件。

其中效果图如下：