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我需要关于我的代码的指导。按钮单击事件不会触发并发生错误
public class FacultyTemplatedynamic:ITemplate
{
ListItemType ItemType;
string FieldName;
string InfoType;
private bool isEditMode = false;
protected bool isInEditMode
{
get { return this.isEditMode; }
set { this.isEditMode = value; }
}
public FacultyTemplatedynamic(ListItemType itemType, string field_name, string info_type)
{
FieldName = field_name;
ItemType = itemType;
InfoType = info_type;
}
public void InstantiateIn(Control container)
{
switch (ItemType)
{
case ListItemType.Header:
Literal header_litrl = new Literal();
header_litrl.Text = "<b>" + FieldName + "</b>";
container.Controls.Add(header_litrl);
break;
case ListItemType.Item:
switch (InfoType)
{
case "Command":
ImageButton edit_button = new ImageButton();
edit_button.ID = "edit_button";
edit_button.ImageUrl = "~/Images/edit.gif";
edit_button.CommandName = "Edit";
edit_button.ToolTip = "Edit";
container.Controls.Add(edit_button);
break;
default:
Label field_lbl = new Label();
field_lbl.ID = "labelName";
//field_lbl.Visible =!(bool) isInEditMode;
field_lbl.Text = String.Empty; //we will bind it later through 'OnDataBinding' event
field_lbl.DataBinding += new EventHandler(OnDataBinding);
container.Controls.Add(field_lbl);
break;
}
break;
case ListItemType.EditItem:
if (InfoType == "Command")
{
ImageButton update_button = new ImageButton();
update_button.ID = "update_button";
update_button.CommandName = "Update";
update_button.ImageUrl = "~/Images/update.gif";
update_button.ToolTip = "Update";
update_button.OnClientClick = "return confirm('Are you sure to update the record?')";
container.Controls.Add(update_button);
ImageButton cancel_button = new ImageButton();
cancel_button.ImageUrl = "~/Images/cancel.gif";
cancel_button.ID = "cancel_button";
cancel_button.CommandName = "Cancel";
cancel_button.ToolTip = "Cancel";
container.Controls.Add(cancel_button);
}
else// for other 'non-command' i.e. the key and non key fields, bind textboxes with corresponding field values
{
Label field_lbl1 = new Label();
field_lbl1.ID = "LabelEdit";
//field_lbl1.Visible = (bool)isInEditMode;
field_lbl1.Text = String.Empty; //we will bind it later through 'OnDataBinding' event
field_lbl1.DataBinding += new EventHandler(OnDataBinding);
container.Controls.Add(field_lbl1);
}
break;
}
}
private void OnDataBinding(object sender, EventArgs e)
{
object bound_value_obj = null;
Control ctrl = (Control)sender;
IDataItemContainer data_item_container = (IDataItemContainer)ctrl.NamingContainer;
bound_value_obj = DataBinder.Eval(data_item_container.DataItem, FieldName);
switch (ItemType)
{
case ListItemType.Item:
Label field_ltrl = (Label)sender;
field_ltrl.Text = bound_value_obj.ToString();
break;
case ListItemType.EditItem:
TextBox field_txtbox = (TextBox)sender;
field_txtbox.Text = bound_value_obj.ToString();
break;
}
}
}
private void CreateTemplatedGridView()
{
PopulateTable();
for (int i = 0; i < dt.Columns.Count; i++)
{
TemplateField tf = new TemplateField();
tf.HeaderTemplate = new FacultyTemplatedynamic(ListItemType.Header, dt.Columns[i].ColumnName, dt.Columns[i].DataType.Name);
tf.ItemTemplate = new FacultyTemplatedynamic(ListItemType.Item, dt.Columns[i].ColumnName, dt.Columns[i].DataType.Name);
tf.EditItemTemplate = new FacultyTemplatedynamic(ListItemType.EditItem, dt.Columns[i].ColumnName, dt.Columns[i].DataType.Name);
GrdMarkAttendance.Columns.Add(tf);
}
TemplateField tf1 = new TemplateField();
GrdMarkAttendance.Columns.Add(tf1);
GrdMarkAttendance.DataSource = dt;
GrdMarkAttendance.DataBind();
}
private void PopulateTable()
{
dt = new DataTable();
dt = obj.GetRegister();
}
protected void GrdMarkAttendance_RowDataBound(object sender, GridViewRowEventArgs e)
{
PopulateTable();
int i = dt.Columns.Count;
if (e.Row.RowType == DataControlRowType.DataRow)
{
DropDownList ddl = new DropDownList();
ddl.ID = "ddl";
ddl.Items.Insert(0, "Present");
ddl.Items.Insert(1, "Absent");
ddl.Items.Insert(2, "Leave");
e.Row.Cells[i].Controls.Add(ddl);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
}
当我运行该页面并点击按钮，我得到了以下错误：
服务器错误“/”应用。
找到具有相同ID'labelName'的多个控件。 FindControl要求控件具有唯一的ID。
描述：执行当前Web *请求期间发生未处理的异常。请查看堆栈跟踪以获取有关该错误的更多信息以及* *源自代码的位置。 *
异常详细信息：System.Web.HttpException：用相同的ID'标签'找到了多个控制。 ** FindControl ** 要求控件具有唯一的ID。
* 源错误：*在当前web请求的执行过程中生成
未处理的异常。 *有关异常来源和位置的信息可以使用* 以下的异常堆栈跟踪进行标识。
* 堆栈跟踪：*
*[HttpException (0x80004005): Multiple controls with the same ID 'labelName' were found.* *FindControl requires that controls have unique IDs.]*
*System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection* *controls) +265*
*System.Web.UI.Control.FillNamedControlsTable(Control namingContainer, ControlCollection* * controls)* +311
*System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +145*
*System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +365*
*System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +365*
*System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +365*
*System.Web.UI.Control.FindControl(String id, Int32 pathOffset) +365*
*System.Web.UI.Page.FindControl(String id) +38*
*System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad)* +287
*System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean* *includeStagesAfterAsyncPoint) +4911*
- 我不知道为什么这个错误就要昨天是wroking罚款，但是当我使用 * FindControl已在行的特殊细胞它开始给我错误，但现在我删除*该代码和点击按钮它显示错误。* 请给你的* **建议，以便如果我格式错误后的问题，我还可以移动
对不起或提供足够的数据
在你每一个控制web应用应该有一个唯一的ID相同id..Find两个或更多的控制。 – coder
你在哪里使用ID为'labelName'的标签，你可以向我们展示gridview设计代码.. –
@AmolKolekar请检查顶部的代码现在我动态创建模板字段并将它们添加到gridview编程 – Ranjan