GridView 动态生成模版列

最近项目中有用到GridView 的列是动态生成的,并且是用模版列.查找了网上的方法.作法如下:

1. 写一个类.主要继承ITemplate

 

public class GridViewTemplate : ITemplate   
     {   
         private DataControlRowType templateType;     //区分列的类型
         private string columnName;                   //名称
       
         public GridViewTemplate(DataControlRowType type, string colname)   //构造
         {   
             templateType = type;   
             columnName = colname;   
         }   
       
         public void InstantiateIn(System.Web.UI.Control container)   
         {   
             switch (templateType)   
             {   
                 case DataControlRowType.Header:       //列头           
                     Literal lc = new Literal();          
                     lc.Text = "<B>" + columnName + "</B>";   //列头名称        
                     container.Controls.Add(lc);          
                     break;          
                 case DataControlRowType.DataRow:      //数据行
                     LinkButton lbnFileName = new LinkButton();   //添加LinkButton控件,正常显示
                     lbnFileName.ID = "lbn" + columnName;
                     lbnFileName.DataBinding += new EventHandler(lbnFileName_DataBinding);//数据绑定
                     lbnFileName.Click += new EventHandler(lbnFileName_Click);//Click 事件
                     container.Controls.Add(lbnFileName);
                     //Guid
                     Label lblGuid = new Label();    //添加lable ,隐藏
                     lblGuid.ID = "lblGuid" + columnName;
                     lblGuid.DataBinding += new EventHandler(lblGuid_DataBinding);
                     lblGuid.Visible = false;
                     container.Controls.Add(lblGuid);
                     //Type
                     Label lblType = new Label(); //添加lable ,隐藏
                     lblType.ID = "lblType" + columnName;
                     lblType.DataBinding += new EventHandler(lblType_DataBinding);
                     lblType.Visible = false;
                     container.Controls.Add(lblType);
                     break;                         
                 default:   
         
                     break;   
             }   
         }

        void lblType_DataBinding(object sender, EventArgs e)  //Lable 的数据绑定
        {
            Label lbl = (Label)sender;
            GridViewRow row = (GridViewRow)lbl.NamingContainer;
            lbl.Text =  DataBinder.Eval(row.DataItem, "lblType" +columnName).ToString();  
        }

        void lblGuid_DataBinding(object sender, EventArgs e) //Lable 的数据绑定

        {
             Label lbl = (Label)sender;
             GridViewRow row = (GridViewRow)lbl.NamingContainer;
             lbl.Text =  DataBinder.Eval(row.DataItem, "lblGuid" +columnName).ToString();  

        }

        void lbnFileName_Click(object sender, EventArgs e) //LinkButton的Click 事件,这里主要是来下载文档
        {
            try
            {
                GridViewRow objGridViewRow = (GridViewRow)((LinkButton)sender).NamingContainer;

                string strDQAManualFolder = HttpContext.Current.Server.MapPath(@"~\DOC\Manual");
                string strFileName = ((LinkButton)objGridViewRow.FindControl("lbn" + columnName)).Text;
                string strGuid = ((Label)objGridViewRow.FindControl("lblGuid" + columnName)).Text;
                string strFileType = ((Label)objGridViewRow.FindControl("lblType" + columnName)).Text;

                HttpContext.Current.Response.ClearHeaders();
                HttpContext.Current.Response.ContentType = "application/octet-stream";
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(strFileName, System.Text.Encoding.UTF7) + "");
                HttpContext.Current.Response.TransmitFile(strDQAManualFolder + "\\" + strGuid + '.' + strFileType);
            }
            catch (Exception ex)
            {
                //Response.Write(ex.ToString());
            }
        }

        void lbnFileName_DataBinding(object sender, EventArgs e)//LinkButton 数据绑定
        {
            LinkButton lbn = (LinkButton)sender;
            GridViewRow row = (GridViewRow)lbn.NamingContainer;
            lbn.Text = DataBinder.Eval(row.DataItem, columnName).ToString();
        }       
       
     }   

2. GridView 模版列的添加

 

1 TemplateField customField;
2 customField = new TemplateField();
3 customField.HeaderTemplate = new GridViewTemplate(DataControlRowType.Header, listDesc);
4 customField.ItemTemplate = new GridViewTemplate(DataControlRowType.DataRow, column);
5 this.gdvChnManual.Columns.Add(customField);
6 
7 //这里可以自由加列
8 this.gdvChnManual.DataSource = dt;
9 this.gdvChnManual.DataBind();