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标题: 动态生成的模板列中含有TextBox，虽然给了ID，找到控件 [打印本页]

作者: shiningrise 时间: 2012-10-16 01:39
标题: 动态生成的模板列中含有TextBox，虽然给了ID，找到控件
本帖最后由 shiningrise 于 2012-10-16 12:07 编辑

动态生成的模板列中含有TextBox，虽然给了ID，但还是i同办法FindControl找到这个控件

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Text;
using System.IO;
using AspNet = System.Web.UI.WebControls;

namespace ExtAspNet.Examples.data
{

public class GenderTemplate : ITemplate
{

      public void InstantiateIn(System.Web.UI.Control container)
      {
         AspNet.TextBox labGender = new AspNet.TextBox();
         labGender.ID = "tbxSex";
         labGender.DataBinding += new EventHandler(labGender_DataBinding);
         container.Controls.Add(labGender);
      }

      private void labGender_DataBinding(object sender, EventArgs e)
      {
         AspNet.TextBox labGender = (AspNet.TextBox)sender;

         IDataItemContainer dataItemContainer = (IDataItemContainer)labGender.NamingContainer;

         string gender = ((DataRowView)dataItemContainer.DataItem)["Gender"].ToString();

         labGender.Text = gender;
      }

}

public partial class grid_dynamic_columns2 : PageBase
{
      #region Page_Init

      // 注意：动态创建的代码需要放置于Page_Init（不是Page_Load），这样每次构造页面时都会执行
      protected void Page_Init(object sender, EventArgs e)
      {
         InitGrid();
      }

      private void InitGrid()
      {
         ExtAspNet.BoundField bf;

         bf = new ExtAspNet.BoundField();
         bf.DataField = "Id";
         bf.DataFormatString = "{0}";
         bf.HeaderText = "编号";
         Grid1.Columns.Add(bf);

         bf = new ExtAspNet.BoundField();
         bf.DataField = "Name";
         bf.DataFormatString = "{0}";
         bf.HeaderText = "姓名";
         Grid1.Columns.Add(bf);

         bf = new ExtAspNet.BoundField();
         bf.DataField = "EntranceYear";
         bf.DataFormatString = "{0}";
         bf.HeaderText = "入学年份";
         Grid1.Columns.Add(bf);

         bf = new ExtAspNet.BoundField();
         bf.DataToolTipField = "Major";
         bf.DataField = "Major";
         bf.DataFormatString = "{0}";
         bf.HeaderText = "所学专业";
         bf.ExpandUnusedSpace = true;
         Grid1.Columns.Add(bf);

         ExtAspNet.TemplateField tf = new TemplateField();
         tf.Width = Unit.Pixel(100);
         tf.HeaderText = "性别（模板列）";
         tf.ItemTemplate = new GenderTemplate();
         Grid1.Columns.Add(tf);

         Grid1.DataKeyNames = new string[] { "Id", "Name" };
      }

      #endregion

      protected void Page_Load(object sender, EventArgs e)
      {
         if (!IsPostBack)
         {
            LoadData();
         }
      }

      #region LoadData

      private void LoadData()
      {
         DataTable table = GetDataTable();

         Grid1.DataSource = table;
         Grid1.DataBind();
      }

      #endregion

      protected void Button1_Click(object sender, EventArgs e)
      {
         string strSex = string.Empty;;
         labResult.Text = HowManyRowsAreSelected(Grid1);
         for (int i = 0; i < this.Grid1.Rows.Count; i++)
         {
            TextBox tbxSex = (TextBox)this.Grid1.Rows.FindControl("tbxSex");
            if (tbxSex != null)//永远取不值
            {
                  strSex += tbxSex.Text;
            }
         }
         Alert.ShowInTop(strSex);
      }

}
}
动态生的控件，回发时并没有public void InitTemplateContainers()，所以FindControl打不到这个控件
public void InitTemplateContainers()
下面这样改后可以正常使用：但不是长久之计，，还是要改进控件比较好，俱觉得　
      protected void Page_Load(object sender, EventArgs e)
      {
         if (!IsPostBack)
         {
            LoadData();
         }
         else
         {
            foreach (var item in this.Grid1.Rows)
            {
                  item.InitTemplateContainers();

            }
         // this.Grid1.UpdateTemplateFields();
         }
      }
找到方法了：
　　在Grid类的LoadPostData方法中中加入
      public override bool LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection)
      {
　　　　//恢复动态模块控件树             if( row.TemplateContainers == null )
{
         　 foreach (var row in this.Rows)
            {
            　　　row.InitTemplateContainers();
            }
}

作者: shiningrise 时间: 2012-10-22 07:50
为了更好使用模板列
我作了以下改动，建议更新到官方源文件里GridRow.cs
/// <summary>
      /// 初始化模板容器
      /// </summary>
      public void InitTemplateContainers()
      {
         GridColumnCollection columns = _grid.AllColumns;
         if (TemplateContainers == null)
         {
            TemplateContainers = new GridRowControl[columns.Count];
         }
//针动动态添加的模板列，要相应增加TemplateContainers的长度
if (TemplateContainers.Length < columns.Count)
         {
            GridRowControl[] newGridRowControlContainers = new GridRowControl[columns.Count];
            for (int i = 0; i < TemplateContainers.Length; i++)
            {
                  newGridRowControlContainers[i] = TemplateContainers[i];
            }
            TemplateContainers = newGridRowControlContainers;
         }

         for (int i = 0, count = columns.Count; i < count; i++)
         {
            GridColumn column = columns;
            if (column is TemplateField)
            {
                  if (TemplateContainers[column.ColumnIndex] == null)
                  {
                     TemplateField field = column as TemplateField;
                     GridRowControl control = new GridRowControl(DataItem, RowIndex);
                     //control.ID = String.Format("{0}_{1}_{2}", Grid.ID, RowIndex, column.ColumnIndex);
                     control.ID = String.Format("c{0}r{1}", column.ColumnIndex, RowIndex);

                     field.ItemTemplate.InstantiateIn(control);

                     Controls.Add(control);
                     TemplateContainers[column.ColumnIndex] = control;
                  }
            }

         }
      }

Grid.cs
      /// <summary>
      /// 处理回发数据
      /// </summary>
      /// <param name="postDataKey">回发数据键</param>
      /// <param name="postCollection">回发数据集</param>
      /// <returns>回发数据是否改变</returns>
      public override bool LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection)
      {
         //检查并恢复GridRow模板列（包括动态模板列）
         foreach (var row in this.Rows)
         {
            row.InitTemplateContainers();
         }

作者: iaimg 时间: 2012-10-31 02:25
我也遇到了这样的问题

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