我需要有关我的代码的指导。
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)
{
}
当我运行此页面并点击按钮时出现以下错误：
“/”应用程序中的服务器错误。
找到了具有相同ID“labelName”的多个控件。 FindControl要求控件具有唯一ID。
描述：执行当前Web *请求期间发生了未处理的异常。请查看堆栈跟踪以获取有关错误的更多信息以及它在代码中的起源*。 *
异常详细信息：System.Web.HttpException：找到具有相同ID的多个控件 'labelName' 。 ** FindControl ** 要求控件具有唯一ID。
* 来源错误：*
在执行当前Web请求期间生成了未处理的异常。 *可以使用*标识有关异常的来源和位置的信息 下面的异常堆栈跟踪。
* 堆栈追踪：*
*[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*
很抱歉，如果我以错误的格式发布问题或提供的数据不足
答案 0 :(得分：1)
请阅读堆栈跟踪！
第一行：“找到具有相同ID”labelName“的多个控件”
检查您的视图是否具有相同ID的多个控件。
编辑：
尝试按Ctrl + F并搜索labelName ..如果您在同一文档中找到2 ..您发现了问题...
答案 1 :(得分：0)
在您的页面中，有两个或多个具有相同ID的控件。查找控件并为其指定不同的ID