如何在ASP.NET中的代码中的HTML按钮中获取隐藏字段值 [英] How to get hidden field value in a HTML button in code behind in ASP.NET
问题描述
我创建了一个带转发器的HTML表。在此表中，我添加了一个按钮列。它是一个HTML按钮，因为ASP按钮在标签内部不起作用。因此，我在此HTML按钮内添加了一个ASP隐藏字段以获取所选的行ID。我尝试了几种方法从隐藏字段中获取ID。我想在按钮点击时获得选定的行ID。
我尝试过的方法：
我试过以下
我试过这段代码，但在SendValueToSender（id）中显示错误;线。 SendValueToSender使用建议生成方法以红线显示。但是当我运行代码并单击按钮显示错误时。
button_edit_ServerClick
I have created an HTML table with a repeater. In this table, I added a button column. It is an HTML button because ASP buttons not working inside of the tag. Therefore, I added an ASP hidden field inside of this HTML button to get selected row ID. I tried several ways to get the ID from the hidden field. I want to get selected row ID when the button click.
What I have tried:
I have tried followings
I have tried this code but shows error in SendValueToSender(id); line. SendValueToSender is shown in red line using suggestions It generated method. But when I run the code and click the button shows error.
button_edit_ServerClick
protected void button_edit_ServerClick(object sender, EventArgs e)
{
try
{
var btn = (HtmlButton)sender;
var child = btn.FindControl("hidden");
string id = Convert.ToString(((HiddenField)child).Value);
SendValueToSender(id);
Response.Write("id" + id);
}
catch (Exception exception)
{
Response.Write(exception);
}
}
SendValueToSender的生成方法
Generated method for SendValueToSender
private void SendValueToSender(string id)
{
throw new NotImplementedException();
}
错误 - 添加SendValueToSender方法后
System.NotImplementedException：未实现方法或操作。 at EasyTravel.Manage.ManageNode.SendValueToSender（String id）位于C：\ Users \ kularathna \ source \repos\EasyTravel \EasyTravel \Manage \ManageNode.aspx.cs：EasyTravel.Manage第241行.ManageNode.button_edit_ServerClick（Object sender，EventArgs e）在C：\ Users \ kularathna \ source \repos\EasyTravel \EasyTravel \Manage \ManageNode.aspx.cs：第229行
Error-After add SendValueToSender method
System.NotImplementedException: The method or operation is not implemented. at EasyTravel.Manage.ManageNode.SendValueToSender(String id) in C:\Users\kularathna\source\repos\EasyTravel\EasyTravel\Manage\ManageNode.aspx.cs:line 241 at EasyTravel.Manage.ManageNode.button_edit_ServerClick(Object sender, EventArgs e) in C:\Users\kularathna\source\repos\EasyTravel\EasyTravel\Manage\ManageNode.aspx.cs:line 229
229 - SendValueToSender(id);
241 - throw new NotImplementedException();
PageLoad方法
PageLoad Method
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
//Create Database Connection
SqlConnection con = new SqlConnection("Data Source= LAPTOP-J70EHC58 ; Initial Catalog= Bus_Management_System ; Integrated Security = True ; Connect Timeout = 30 ; ");
con.Open();
//Retrieve node details
string sqlst = "SELECT * FROM Node ";
SqlDataAdapter sqlData = new SqlDataAdapter(sqlst, con);
DataTable dt = new DataTable();
sqlData.Fill(dt);
rptrNode.DataSource = dt;
rptrNode.DataBind();
}
}
ManageNode.aspx
ManageNode.aspx
<table id="datatable-buttons" class="table table-striped table-bordered">
<thead>
<tr>
<th>Node_ID</th>
<th>Node_Name</th>
<th>Starting_Node</th>
<th>Ending_Node</th>
<th>Distance_Between_Nodes</th>
<th>Ticket_Price</th>
<th>Action</th>
</tr>
</thead>
<tbody>
<asp:Repeater ID="rptrNode" runat="server">
<ItemTemplate>
<tr>
<td>
<asp:Label ID="lblNodeID" runat="server" Text='<%# Eval("Node_ID") %>'></asp:Label></td>
<td>
<asp:Label ID="lblNodeName" runat="server" Text='<%# Eval("Node_Name") %>'></asp:Label></td>
<td>
<asp:Label ID="lblStartingNode" runat="server" Text='<%# Eval("Starting_Node") %>'></asp:Label></td>
<td>
<asp:Label ID="lblEndingNode" runat="server" Text='<%# Eval("Ending_Node") %>'></asp:Label></td>
<td>
<asp:Label ID="lblDistance" runat="server" Text='<%# Eval("Distance_Between_Nodes") %>'></asp:Label></td>
<td>
<asp:Label ID="lblTicketPrice" runat="server" Text='<%# Eval("Ticket_Price") %>'></asp:Label></td>
<td>
<button runat="server" clientidmode="Static" class="btn btn-success" id="button_edit" onserverclick="button_edit_ServerClick">
<asp:HiddenField runat="server" ID="hidden" Value='<%#Eval("Node_ID") %>' />
Edit
</button>
</td>
</tr>
</ItemTemplate>
</asp:Repeater>
</tbody>
</table>
按钮列（它位于ManageNode.aspx之上）
Button Column(It is in above ManageNode.aspx)
<td>
<button runat="server" clientidmode="Static" class="btn btn-success" id="button_edit" onserverclick="button_edit_ServerClick">
<asp:HiddenField runat="server" ID="hidden" Value='<%#Eval("Node_ID") %>' />Edit
</button>
</td>
推荐答案
您得到的错误是 NotImplementedException ，这是正常的，因为
The error you get is a NotImplementedException, which is normal since the line
throw new NotImplementedException();已达到。
这意味着单击该按钮会实际调用 SendValueTosender（）方法。您可能忘记实现 SendValueToSender（）方法。
is reached.
Which means that the click of the button acually calls the SendValueTosender() method. You may have forgotten to implement the SendValueToSender() method.
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