如何使用 C# 使用 SQL 服务器数据库更新 ASP.NET 中的配置文件

Question

我查看了一些用于更新使用 Access 数据库的配置文件详细信息的代码。但是，对于我当前的程序，我目前正在使用 SQL 服务器数据库。

因此，我正在尝试调整这些代码以使其适用于 SQL 服务器数据库。

编程按钮的 objective 允许程序更新已登录用户的用户配置文件详细信息。

但是，我无法执行此操作，因为单击按钮后，我无法在数据库中输入信息。

抛出异常：

Error 15 Argument missing LINE 41

这是我的代码隐藏文件：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
public partial class RealClientEditProfileaspx : System.Web.UI.Page

{
    public string UFlag = "F"; public string strUserId;
    static readonly string scriptSuccessUpdate = "<script language =\"javascript\">\n" +
      "alert (\"Update Successful - Please surf to other pages to shop\");\n </script>";
    protected void Page_Load(object sender, EventArgs e)
    {
        firstnameLabel.Text = Session["cFirstName"].ToString();
        lastnameLabel.Text = Session["cLastName"].ToString();
        dobLabel.Text = Session["cDOB"].ToString();
        companyLabel.Text = Session["cCompanyName"].ToString();
        addressLabel.Text = Session["cAddress"].ToString();
        zipcodeLabel.Text = Session["cZipCode"].ToString();
        phonenumberLabel.Text = Session["cPhoneNo"].ToString();
        faxnumberLabel.Text = Session["cfax"].ToString();
        emailLabel.Text = Session["cEmail"].ToString();
        passwordLabel.Text = Session["cPassword"].ToString();
        foreach (char ch in passwordLabel.Text.ToCharArray())
        {
            realPasswordLabel.Text += "*";
        }
    }

    public void UpdateCustomer(string strFName, string strFValue)
    {
        SqlConnection conn = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=D:\Desktop\TemporarySter\App_Data\legitdatabase.mdf;Integrated Security=True;Connect Timeout=30;MultipleActiveResultSets=true");
        conn.Open();
        Type csType = this.GetType();
        SqlCommand com;
        SqlDataReader rdr;
        String strSQL = "UPDATE Client SET " + strFName + " = @newValue WHERE ClientNo = @ClientNo ";
        com = new SqlCommand(strSQL, conn);
        com.Parameters.Add("@newValue", ).Value = strFValue;
        com.ExecuteNonQuery();
        UFlag = "T";
        conn.Close();

        string insertQuery = "UPDATE Client (cFirstName, cLastName, cDOB, cCompanyName, cAddress, cZipCode, cPhoneNo, cFax, cEmail, cUsername, cPassword) values (@firstname,@lastname,@dob,@companyname,@address,@zipcode,@phoneno,@fax,@email,@password)";
        com = new SqlCommand(insertQuery, conn);
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
       strUserId = (string)Session["sUserId"];

        if (firstnameTB.Text != "")
        {
            String strFName = "cFirstName"; String strFValue = firstnameTB.Text;
            UpdateCustomer(strFName, strFValue);

        }

        if (lastnameTB.Text != "")
        {
            String strFName = "cLastName"; String strFValue = lastnameTB.Text;
            UpdateCustomer(strFName, strFValue);
        }

        if (dobTB.Text != "")
        {
            String strFName = "cDOB"; String strFValue = dobTB.Text;
            UpdateCustomer(strFName, strFValue);
        }

        if (addressTB.Text != "")
        {
            String strFName = "cAddress"; String strFValue = addressTB.Text;
            UpdateCustomer(strFName, strFValue);
        }

        if (zipcodeTB.Text != "")
        {
            String strFName = "cZipCode"; String strFValue = zipcodeTB.Text;
            UpdateCustomer(strFName, strFValue);
        }

        if (phonenumberTB.Text != "")
        {
            String strFName = "cPhoneNo"; String strFValue = phonenumberTB.Text;
            UpdateCustomer(strFName, strFValue);
        }

        if (faxnumberTB.Text != "")
        {
            String strFName = "cFax"; String strFValue = faxnumberTB.Text;
            UpdateCustomer(strFName, strFValue);
        }

        if (emailTB.Text != "")
        {
            String strFName = "cEmail"; String strFValue = emailTB.Text;
            UpdateCustomer(strFName, strFValue);
        }

        if (passwordTB.Text != "")
        {
            String strFName = "cPassword"; String strFValue = passwordTB.Text;
            UpdateCustomer(strFName, strFValue);
        }

        if (UFlag == "T")
        {
            Type strType = this.GetType();
            ClientScript.RegisterStartupScript(strType, "Success", scriptSuccessUpdate);
        }
    }
}

这是 ASPX 标记：

<%@ Page Title="" Language="C#" MasterPageFile="~/ClientPortal.master" AutoEventWireup="true" CodeFile="RealClientEditProfileaspx.aspx.cs" Inherits="RealClientEditProfileaspx" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
    <style type="text/css">

        .style1
        {
            font-size: 1em;
        }
        .style4
        {
            width: 208px;
        }
        .style8
        {
            color: #FF9933;
        }
        .auto-style8 {
            width: 121px;
            text-align: right;
        }
        .auto-style9 {
            width: 227px;
            text-align: left;
        }
        .auto-style10 {
            text-align: left;
        }
    </style>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <br />
    <table class="auto-style2">
        <tr>
            <td class="auto-style8">
                <asp:Label ID="Label1" runat="server" Text="Particulars"></asp:Label>
            </td>
            <td class="auto-style9">&nbsp;
                <asp:Label ID="Label12" runat="server" style="text-align: left" Text="Current particulars"></asp:Label>
            </td>
            <td class="auto-style10">
                <asp:Label ID="Label23" runat="server" Text="Updated particulars"></asp:Label>
            </td>
        </tr>
        <tr>
            <td class="auto-style8">First Name:</td>
            <td class="auto-style9">&nbsp;
                <asp:Label ID="firstnameLabel" runat="server" Text="Label"></asp:Label>
            </td>
            <td class="auto-style10">
                <asp:TextBox ID="firstnameTB" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td class="auto-style8">
                <asp:Label ID="Label3" runat="server" Text="Last Name:"></asp:Label>
            </td>
            <td class="auto-style9">&nbsp;
                <asp:Label ID="lastnameLabel" runat="server" Text="Label"></asp:Label>
            </td>
            <td class="auto-style10">
                <asp:TextBox ID="lastnameTB" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td class="auto-style8">
                <asp:Label ID="Label4" runat="server" Text="Date Of Birth:"></asp:Label>
            </td>
            <td class="auto-style9">&nbsp;
                <asp:Label ID="dobLabel" runat="server" Text="Label"></asp:Label>
            </td>
            <td class="auto-style10">
                <asp:TextBox ID="dobTB" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td class="auto-style8">
                <asp:Label ID="Label5" runat="server" Text="Company Name:"></asp:Label>
            </td>
            <td class="auto-style9">&nbsp;
                <asp:Label ID="companyLabel" runat="server" Text="Label"></asp:Label>
            </td>
            <td class="auto-style10">
                <asp:TextBox ID="companyTB" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td class="auto-style8">
                <asp:Label ID="Label6" runat="server" Text="Address:"></asp:Label>
            </td>
            <td class="auto-style9">&nbsp;
                <asp:Label ID="addressLabel" runat="server" Text="Label"></asp:Label>
            </td>
            <td class="auto-style10">
                <asp:TextBox ID="addressTB" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td class="auto-style8">
                <asp:Label ID="Label7" runat="server" Text="Zip Code:"></asp:Label>
            </td>
            <td class="auto-style9">&nbsp;
                <asp:Label ID="zipcodeLabel" runat="server" Text="Label"></asp:Label>
            </td>
            <td class="auto-style10">
                <asp:TextBox ID="zipcodeTB" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td class="auto-style8">
                <asp:Label ID="Label8" runat="server" Text="Phone Number:"></asp:Label>
            </td>
            <td class="auto-style9">&nbsp;
                <asp:Label ID="phonenumberLabel" runat="server" Text="Label"></asp:Label>
            </td>
            <td class="auto-style10">
                <asp:TextBox ID="phonenumberTB" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td class="auto-style8">
                <asp:Label ID="Label9" runat="server" Text="Fax Number:"></asp:Label>
            </td>
            <td class="auto-style9">&nbsp;
                <asp:Label ID="faxnumberLabel" runat="server" Text="Label"></asp:Label>
            </td>
            <td class="auto-style10">
                <asp:TextBox ID="faxnumberTB" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td class="auto-style8">
                <asp:Label ID="Label10" runat="server" Text="Email:"></asp:Label>
            </td>
            <td class="auto-style9">&nbsp;
                <asp:Label ID="emailLabel" runat="server" Text="Label"></asp:Label>
            </td>
            <td class="auto-style10">
                <asp:TextBox ID="emailTB" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td class="auto-style8">
                <asp:Label ID="Label11" runat="server" Text="Password:"></asp:Label>
            </td>
            <td class="auto-style9">&nbsp;
                <asp:Label ID="realPasswordLabel" runat="server" Text="********"></asp:Label>
            </td>
            <td class="auto-style10">
                <asp:TextBox ID="passwordTB" runat="server"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td class="auto-style8">&nbsp;</td>
            <td class="auto-style9">
                <asp:TextBox ID="passwordLabel" runat="server" ReadOnly="True" TextMode="Password" Visible="False"></asp:TextBox>
            </td>
            <td class="auto-style10">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" style="text-align: right" Text="Update" />
            </td>
        </tr>
    </table>
</asp:Content>

Answer 1

实际修复：

您必须为 @CustomerNo 参数提供一个值。在 Button1_Click 方法中，您有一个名为 strUserId 的变量，应将其传递给 UpdateCustomer():

UpdateCustomer(strUserId, strFName, strFValue);

然后在 UpdateCustomer:

public void UpdateCustomer(string strUserId, string strFName, string strFValue)
{
    ...

    com.Parameters.Add("@ClientNo", ).Value = strUserId;
    com.Parameters.Add("@newValue", ).Value = strFValue;

然后删除 INSERT 逻辑，因为这不属于 "updating customers".

的方法

改进建议

真的，这可以使用一点面向对象的优点。我会在 C# 中创建一个 class 来代表客户：

public class User
{
    public long Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public DateTime DateOfBirth { get; set; }
    public string CompanyName { get; set; }
    public string Address { get; set; }
    public string ZipCode { get; set; }
    public string PhoneNumber { get; set; }
    public string FaxNumber { get; set; }
    public string Email { get; set; }
    public string Password { get; set; }
}

这代表您的域模型。接下来，您想在您的 UserControl 中使用它。

首先，Button1_Click方法变成：

protected void Button1_Click(object sender, EventArgs e)
{
    User customer = new User()
    {
        Id = long.Parse((string)Session["sUserId"]),
        FirstName = firstnameTB.Text.Trim(),
        LastName = lastnameTB.Text.Trim(),
        DateOfBirth = DateTime.Parse(dobTB.Text.Trim()),
        Address = addressTB.Text.Trim(),
        ZipCode = zipcodeTB.Text.Trim(),
        PhoneNumber = phonenumberTB.Text.Trim(),
        FaxNumber = faxnumberTB.Text.Trim(),
        Email = emailTB.Text.Trim(),
        Password = passwordTB.Text.Trim()
    };

    UpdateCustomer(customer);

    if (UFlag == "T")
    {
        Type strType = this.GetType();
        ClientScript.RegisterStartupScript(strType, "Success", scriptSuccessUpdate);
    }
}

这更易于阅读和维护。对 UpdateCustomer 的调用确实只更新了一个客户。现在让我们看看 UpdateCustomer 方法的变化：

public void UpdateCustomer(User customer)
{
    string updateSql =
    @"UPDATE Client
    SET cFirstName = @FirstName,
        cLastName  = @LastName,
        cDOB       = @DateOfBirth,
        cAddress   = @Address,
        cZipCode   = @ZipCode,
        cPhoneNo   = @PhoneNumber,
        cFax       = @FaxNumber,
        cEmail     = @Email,
        cPassword  = @Password
    WHERE ClientNo = @Id";

    using (var connection = new SqlConnection(@"..."))
    {
        connection.Open();
        var command = new SqlCommand(updateSql, connection);
        var args = command.Parameters;

        args.Add("@FirstName", customer.FirstName);
        args.Add("@LastName", customer.LastName);
        args.Add("@DateOfBirth", customer.DateOfBirth);
        args.Add("@Address", customer.Address);
        args.Add("@ZipCode", customer.ZipCode);
        args.Add("@PhoneNumber", customer.PhoneNumber);
        args.Add("@FaxNumber", customer.FaxNumber);
        args.Add("@Email", customer.Email);
        args.Add("@Password", customer.Password);
        args.Add("@Id", customer.Id);

        command.ExecuteNonQuery();
    }

    UFlag = "T";
}

SQL 允许您在一个命令中更新所有列，而不是为每个表单域发出更新。一次只更新一个字段会导致不必要的数据库流量增加。

当用户首次访问页面并且您填充表单字段时，所有字段都应从数据库中填充。

补充阅读

Domain Model
Domain Driven Design and it's compliment, Crafting Wicked Domain Models
Repository Pattern - 用于组织对数据库执行 CRUD 操作的代码。

如何使用 C# 使用 SQL 服务器数据库更新 ASP.NET 中的配置文件

How to update profile in ASP.NET with SQL Server database using C#

c#

sql-server

asp.net

实际修复：

改进建议

补充阅读