DataGrid后台绑定模板列

        需求说明：在DataGrid中显示手机短信过滤类型（手机号码，业务推广短信，帐户变动短信，节日祝福短信），即手机号是否发送相应类型的短信。由于被过滤的短信类型可能会动态添加，因此绑定时只能通过后台动态绑定。接下来以把原需求简化后说明DataGrid动态绑定模板列的过程，下图是示例的显示效果。

       

       1.定义ColumnTemlate继承ITemplate，该类的实例可以赋值给模板列的ItemTemplate属性。ColumnTemlate的作用是在模板列中添加CheckBox控件，并根据绑定的字段设置CheckBox的Checked属性。

//ColumnTemplate 从ITemplate继承。
        //InstantiateIn 定义子控件的属于谁
        public class ColumnTemplate:System.Web.UI.ITemplate
        ...{
            string id;
            string bindField;

            public ColumnTemplate(string id,string bindField)
            ...{
                this.id = id;
                this.bindField = bindField; 
            }

            //Override the ITemplate.InstantiateIn method to ensure 
            //that the templates are created in a CheckBox control and
            //that the CheckBox object's DataBinding event is associated
            //with the BindData method.
            public void InstantiateIn(Control container)
            ...{
                CheckBox ckb = new CheckBox();
                ckb.ID = this.id;
                ckb.DataBinding += new EventHandler(this.BindData);
                container.Controls.Add(ckb);
            }

            //Create a public method that will handle the
            //DataBinding event called in the InstantiateIn method.
            public void BindData(object sender, EventArgs e)
            ...{
                CheckBox ckb = (CheckBox) sender;
                DataGridItem container = (DataGridItem) ckb.NamingContainer;
                string isFilter = ((DataRowView) container.DataItem)[bindField].ToString();  
                ckb.Checked = bool.Parse(isFilter);
            }
        }

 

 

      2.动态生成模板列的页面

public class TemplateColumnDemo : System.Web.UI.Page
        ...{
            protected System.Web.UI.WebControls.DataGrid dgSmsFilters;
        
            private void Page_Load(object sender, System.EventArgs e)
            ...{
                // Put user code to initialize the page here
                if(!Page.IsPostBack)
                ...{
                    this.BindGrid();
                }
            }
            
            Web Form Designer generated code#region Web Form Designer generated code
            override protected void OnInit(EventArgs e)
            ...{
                //
                // CODEGEN: This call is required by the ASP.NET Web Form Designer.
                //
                InitializeComponent();
                base.OnInit(e);
            }
            
            /**//// <summary>
            /// Required method for Designer support - do not modify
            /// the contents of this method with the code editor.
            /// </summary>
            private void InitializeComponent()
            ...{    
                this.Load += new System.EventHandler(this.Page_Load);

            }
            #endregion

            private DataTable GetDates()
            ...{
                DataTable dtSmsFilters = new DataTable("dtSmsFilters");
                DataColumn dcSmsNum = new DataColumn("手机号",Type.GetType("System.String"));
                dtSmsFilters.Columns.Add(dcSmsNum);
                //产生短信过滤类型,实际应根据数据库中内容动态生成的,列数不固定
                DataColumn dcSmsFilterType1 = new DataColumn("业务推广",Type.GetType("System.Boolean"));
                dtSmsFilters.Columns.Add(dcSmsFilterType1);
                DataColumn dcSmsFilterType2 = new DataColumn("帐户变动",Type.GetType("System.Boolean"));
                dtSmsFilters.Columns.Add(dcSmsFilterType2);
                //手动添加测试数据
                DataRow dr;
                for(int i=0;i<10;i++)
                ...{
                    //赋值,无实际意义,只为显示
                    dr = dtSmsFilters.NewRow();
                    dr[0] = "1366666888"+i.ToString();
                    dr[1] = i%2==0?true:false;
                    dr[2] = i%3==0?true:false;
                    dtSmsFilters.Rows.Add(dr);
                }
                return dtSmsFilters;
            }

            private void BindGrid()
            ...{
                DataTable dt = this.GetDates();
                this.dgSmsFilters.DataSource = dt;

                //添加绑定列,绑定手机号
                BoundColumn bc = new BoundColumn();
                bc.HeaderText = dt.Columns[0].ColumnName;
                bc.DataField = dt.Columns[0].ColumnName;
                this.dgSmsFilters.Columns.AddAt(0,bc);

                //添加模板列,绑定过滤短信类型
                for(int i=1;i<dt.Columns.Count;i++)
                ...{
                    TemplateColumn tc = new TemplateColumn();
                    tc.HeaderText = dt.Columns[i].ColumnName;
                    tc.ItemTemplate = new ColumnTemplate("ckb"+i.ToString(),dt.Columns[i].ColumnName);
                    this.dgSmsFilters.Columns.AddAt(i,tc);
                }
                this.dgSmsFilters.DataBind();
            }
        }