無法在GridView中的TemplateFields的RowEditing事件中查找控件

Question

我從代碼隱藏向gridview添加列。 對於boundfields，我能夠在更新行時找到控件和文本框的值。 但是，對於模板字段，我無法獲得後面的代碼控件，所以我無法獲得文本框的值。 可以請建議如何讓文本框的值在代碼隱藏的模板字段

我的代碼

protected void gvbind() 
{ 
    conn.Open(); 
    string Query = "SELECT * FROM testactiondatabase_db.actions"; 
    MySqlCommand MyCommand2 = new MySqlCommand(Query, conn); 

    MySqlDataAdapter MyAdapter = new MySqlDataAdapter(); 
    MyAdapter.SelectCommand = MyCommand2; 
    DataTable dt = new DataTable(); 
    MyAdapter.Fill(dt); 

    TaskGridView.Columns.Clear(); 
    for (int i = 0; i < dt.Columns.Count; i++) 
    { 
     if (dt.Columns[i].ColumnName.ToString().ToUpper().Contains("DATE")) 
     { 
      TemplateField bfield = new TemplateField(); 
      bfield.HeaderTemplate = new GridViewTemplate(ListItemType.Header, dt.Columns[i].ColumnName.ToString()); 
      bfield.ItemTemplate = new GridViewTemplate(ListItemType.Item, dt.Columns[i].ColumnName.ToString()); 
      bfield.EditItemTemplate = new GridViewTemplate(ListItemType.EditItem, dt.Columns[i].ColumnName.ToString()); 
      TaskGridView.Columns.Add(bfield); 
     } 
     else 
     { 
      BoundField boundfield = new BoundField(); 
      boundfield.DataField = dt.Columns[i].ColumnName.ToString(); 
      boundfield.HeaderText = dt.Columns[i].ColumnName.ToString(); 
      TaskGridView.Columns.Add(boundfield); 
     } 
    } 

    TaskGridView.DataSource = dt; 
    TaskGridView.DataBind(); 
    TaskGridView.Width = 600; 
    TaskGridView.HeaderStyle.CssClass = "header"; 
    TaskGridView.RowStyle.CssClass = "rowstyle"; 

    conn.Close(); 
} 

public class GridViewTemplate : ITemplate 
{ 
    ListItemType _templateType; 

    string _columnName; 

    public GridViewTemplate(ListItemType type, string colname) 
    { 

     _templateType = type; 

     _columnName = colname; 
    } 

    void ITemplate.InstantiateIn(System.Web.UI.Control container) 
    { 
     switch (_templateType) 
     { 
      case ListItemType.Header: 
       Label lbl = new Label(); 
       lbl.Text = _columnName; 
       container.Controls.Add(lbl); 
       break; 

      case ListItemType.Item: 
       Label lb1 = new Label(); 
       lb1.DataBinding += new EventHandler(lb1_DataBinding); 
       container.Controls.Add(lb1); 
       break; 

      case ListItemType.EditItem: 
       TextBox tb1 = new TextBox(); 
       tb1.ID = _columnName; 
       tb1.DataBinding += new EventHandler(tb1_DataBinding); 
       tb1.Attributes.Add("class", "myDatePickerClass"); 
       container.Controls.Add(tb1); 
       break; 

      case ListItemType.Footer: 
       CheckBox chkColumn = new CheckBox(); 
       chkColumn.ID = "Chk" + _columnName; 
       container.Controls.Add(chkColumn); 
       break; 
     } 
    } 

    void tb1_DataBinding(object sender, EventArgs e) 
    { 
     TextBox txtdata = (TextBox)sender; 
     GridViewRow container = (GridViewRow)txtdata.NamingContainer; 
     object dataValue = DataBinder.Eval(container.DataItem, _columnName); 
     if (dataValue != DBNull.Value) 
     { 
      txtdata.Text = Convert.ToDateTime(dataValue.ToString()).ToString("dd/MM/yyyy"); 
     } 
    } 

    void lb1_DataBinding(object sender, EventArgs e) 
    { 
     Label txtdata = (Label)sender; 
     GridViewRow container = (GridViewRow)txtdata.NamingContainer; 
     object dataValue = DataBinder.Eval(container.DataItem, _columnName); 
     if (dataValue != DBNull.Value) 
     { 
      txtdata.Text = Convert.ToDateTime(dataValue.ToString()).ToString("dd/MM/yyyy"); 
     } 
    } 
} 

我使用下面的代碼讀取模板字段文本框的值，同時更新該行，但控制是0細胞。

GridViewRow row = (GridViewRow)TaskGridView.Rows[e.RowIndex]; 
TextBox textnew = (TextBox)row.Cells[j].Controls[0]; 

Answer 1

嘗試使用FindControl。

TextBox textnew = TaskGridView.Rows[e.RowIndex].FindControl(_columnName) as TextBox; 

但是，如果我用你的片段像這樣，與手動設置的EditIndex，它也可以...忒文本框的值是小區1被改變。

TaskGridView.EditIndex = 1; 
TaskGridView.DataSource = dt; 
TaskGridView.DataBind(); 
TaskGridView.Width = 600; 
TaskGridView.HeaderStyle.CssClass = "header"; 
TaskGridView.RowStyle.CssClass = "rowstyle"; 

GridViewRow row = (GridViewRow)TaskGridView.Rows[TaskGridView.EditIndex]; 
TextBox textnew = (TextBox)row.Cells[1].Controls[0]; 
textnew.Text = "test";