在我实际开发过程中，刚好遇到c#后端要调用前端js中的方法，所以研究了一下，特分享如下：
前端代码:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="netToWebFantion.aspx.cs" Inherits="WebApplication2.netToWebFantion" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<script type="text/javascript">
function webfunction(par) {
alert("后端调用前端的方法:"+ par);
return false;
}
</script>
<title>c#后端调用前端的方法</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="net"/>
</div>
</form>
</body>
</html>
后端代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication2
{
public partial class netToWebFantion : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void net(object sender, EventArgs e) {
ClientScript.RegisterStartupScript(this.GetType(), "par", "<script>webfunction('你好吗！')</script>");//webfunction('par')是前台jquery函数
}
protected void Button1_Click(object sender, EventArgs e)
{
}
}
}
核心的代码就是后端：ClientScript.RegisterStartupScript(this.GetType(), "par", "<script>webfunction('你好吗！')</script>");