参数化查询'（@ name nvarchar（4000））插入dab（名称）值（@name）'需要参数'@name'，这是未提供的。 [英] The parameterized query '(@name nvarchar(4000))insert into dab (name) values (@name)' expects the parameter '@name', which was not supplied.

问题描述

朋友我想将表格数据插入数据库



这里是代码



Student.cs文件

Friends i want insert form data into database

here is code

Student.cs file

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;

namespace Practice1
{


    public class Student
    {
        public int id { get; set;}
        public string name { get; set;}
        public void add(Student std)
        {
            string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
            using (SqlConnection con = new SqlConnection(CS))
            {
                con.Open();
                SqlCommand cmd = new SqlCommand("insert into dab (name) values (@name)", con);
                cmd.Parameters.AddWithValue ("@name", SqlDbType.VarChar).Value=name;
                cmd.ExecuteNonQuery();

            }


        }

    }
}


And My connection string in web.config file

 <connectionstrings>
    <add name="DBCS">
      connectionString ="Data Source=BHUSHAN-PC\SQLEXPRESS; Initial Catalog=Practice;  Integrated Security=SSPI"
       providerName="System.Data.SqlClient"/>

  </add></connectionstrings>


Friends in Student.cs file 

name is textbox id name....
<table><tbody><tr><td class="style2">
                    First Name</td></tr></tbody></table>
                <td class="style6">
                    <asp:TextBox ID="name" runat="server" ontextchanged="TextBox1_TextChanged">
                </td>
                <table><tbody><tr><td>

the error is

The parameterized query '(@name nvarchar(4000))insert into dab (name) values (@name)' expects the parameter '@name', which was not supplied.

help me out..friends...</td></tr></tbody></table>

推荐答案

添加（param_name，param_typ） [ ^ ]和AddWithValue(param_name， param_value） [ ^ ] ...

你的代码不对，你的选择之一是：

You mixed between Add(param_name, param_typ)[^] and AddWithValue(param_name, param_value)[^]...
Your code just not right, one of your options is:

cmd.Parameters.Add("@name", SqlDbType.VarChar).Value=name;

更改添加功能

change Add function

public void add(Student std)
        {
            string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
            using (SqlConnection con = new SqlConnection(CS))
            {
                con.Open();
                SqlCommand cmd = new SqlCommand("insert into dab (name) values (@name)", con);
                cmd.Parameters.AddWithValue("@name", name);
                cmd.CommandType = CommandType.Text;
                cmd.ExecuteNonQuery();
            }
        }

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