C# 插入sql表时出现问题_C#_Sql

C# 插入sql表时出现问题

c# sql

C# 插入sql表时出现问题,c#,sql,C#,Sql,我有一个我正在开发的网站，当用户创建一个帐户时，我想存储我在CreateUserWizard期间收集的一些附加信息。当我运行代码时，我在尝试将数据写入我创建的表时出错。我在ASPNETDB.mdf数据库（默认情况下创建的数据库）中创建了名为UserProfile的表，其中包含我试图写入的所有列。在web.config文件中，我有： <connectionStrings> <add name="ApplicationServices" connectionString="da

我有一个我正在开发的网站，当用户创建一个帐户时，我想存储我在CreateUserWizard期间收集的一些附加信息。当我运行代码时，我在尝试将数据写入我创建的表时出错。我在ASPNETDB.mdf数据库（默认情况下创建的数据库）中创建了名为UserProfile的表，其中包含我试图写入的所有列。在web.config文件中，我有：

<connectionStrings>
  <add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true"
  providerName="System.Data.SqlClient" />
</connectionStrings>

我在myComman.ExecuteNonQuery（）上得到一个错误；声明--必须声明标量变量“@UserRole”。

如果我注释掉代码，它将不会向数据库表写入任何内容。我做错了什么？

您有

myCommand.Parameters.AddWithValue（“@Role”，UserRole）

，但我认为您应该有

myCommand.Parameters.AddWithValue（“@UserRole”，UserRole）
 您有myCommand.Parameters.AddWithValue（“@Role”，UserRole）
，但我认为您应该有myCommand.Parameters.AddWithValue（“@UserRole”，UserRole）
 对于任何关心此事的人……以下是工作代码：
protected void RegisterUser_CreatingUser(object sender, LoginCancelEventArgs e)
    {
            string trimUserName = RegisterUser.UserName.Trim();
            if (RegisterUser.UserName.Length != trimUserName.Length)
            {
                accountlbl.Text = "The username cannot contain leading or trailing spaces.";
                accountlbl.Visible = true;
                //Cancel the created user info
                e.Cancel = true;
            }

            if (RegisterUser.Password.IndexOf(RegisterUser.UserName, StringComparison.OrdinalIgnoreCase) > 0)
            {
                accountlbl.Text = "The username may not appear anywhere in the password.";
                accountlbl.Visible = true;
                //Cancel the created user info
                e.Cancel = true;
            }

            String FirstName = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("FirstName")).Text;
            String LastName = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("LastName")).Text;
            String Company = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("CompanyName")).Text;
            String PartsList = ((DropDownList)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("companyddl")).SelectedValue;
            String UserName = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("UserName")).Text;
            String Password = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("Password")).Text;
            String Email = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("Email")).Text;
            String Question = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("Question")).Text;
            String Answer = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("Answer")).Text;
            // Insert a new record into User_Profile            
            if (((Company == "OurCompany" || Company == "OurCompany, Inc.") && PartsList == ""))
            {
                if (!User.IsInRole("manager"))
                {
                Roles.AddUserToRole(UserName, "manager");
                Role = "manager";
                }
            }
            if (PartsList == "SF")
            {
                if (!User.IsInRole("user_sf"))
                {
                    Roles.AddUserToRole(UserName, "user_sf");
                    Role = "user_sf";
                }
            }
            if (PartsList == "TL")
            {
                if (!User.IsInRole("user_tl"))
                {
                    Roles.AddUserToRole(UserName, "user_tl");
                    Role = "user_tl";
                }
            }
            if ((Company != "OurCompany" || Company != "OurCompany, Inc.") && PartsList == "")
            {
                if (!User.IsInRole("user"))
                {
                    Roles.AddUserToRole(UserName, "user");
                    Role = "user";
                }
            }

            ////Get your Connection String from the web.config...ApplicationServices is the name I have in my web.config
            string connectionString = ConfigurationManager.ConnectionStrings["ApplicationServices"].ConnectionString;
            string insertSql = "INSERT INTO UserProfile(FirstName, LastName, Company, PartsList, UserName, Password, Email, Question, Answer, Role)" +
                               "VALUES(@FirstName, @LastName, @Company, @Partslist, @UserName, @Password, @Email, @Question, @Answer, @Role)";

            using (SqlConnection myConnection = new SqlConnection(connectionString))
            {
                myConnection.Open();
                SqlCommand myCommand = new SqlCommand(insertSql, myConnection);
                myCommand.Parameters.AddWithValue("@FirstName", FirstName);
                myCommand.Parameters.AddWithValue("@LastName", LastName);
                myCommand.Parameters.AddWithValue("@Company", Company);
                myCommand.Parameters.AddWithValue("@PartsList", PartsList);
                myCommand.Parameters.AddWithValue("@UserName", UserName);
                myCommand.Parameters.AddWithValue("@Password", Password);
                myCommand.Parameters.AddWithValue("@Email", Email);
                myCommand.Parameters.AddWithValue("@Question", Question);
                myCommand.Parameters.AddWithValue("@Answer", Answer);
                myCommand.Parameters.AddWithValue("@Role", Role);

                myCommand.ExecuteNonQuery();
                myConnection.Close();                    
            }
    }

对于任何关心此事的人……以下是工作代码：
protected void RegisterUser_CreatingUser(object sender, LoginCancelEventArgs e)
    {
            string trimUserName = RegisterUser.UserName.Trim();
            if (RegisterUser.UserName.Length != trimUserName.Length)
            {
                accountlbl.Text = "The username cannot contain leading or trailing spaces.";
                accountlbl.Visible = true;
                //Cancel the created user info
                e.Cancel = true;
            }

            if (RegisterUser.Password.IndexOf(RegisterUser.UserName, StringComparison.OrdinalIgnoreCase) > 0)
            {
                accountlbl.Text = "The username may not appear anywhere in the password.";
                accountlbl.Visible = true;
                //Cancel the created user info
                e.Cancel = true;
            }

            String FirstName = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("FirstName")).Text;
            String LastName = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("LastName")).Text;
            String Company = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("CompanyName")).Text;
            String PartsList = ((DropDownList)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("companyddl")).SelectedValue;
            String UserName = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("UserName")).Text;
            String Password = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("Password")).Text;
            String Email = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("Email")).Text;
            String Question = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("Question")).Text;
            String Answer = ((TextBox)RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("Answer")).Text;
            // Insert a new record into User_Profile            
            if (((Company == "OurCompany" || Company == "OurCompany, Inc.") && PartsList == ""))
            {
                if (!User.IsInRole("manager"))
                {
                Roles.AddUserToRole(UserName, "manager");
                Role = "manager";
                }
            }
            if (PartsList == "SF")
            {
                if (!User.IsInRole("user_sf"))
                {
                    Roles.AddUserToRole(UserName, "user_sf");
                    Role = "user_sf";
                }
            }
            if (PartsList == "TL")
            {
                if (!User.IsInRole("user_tl"))
                {
                    Roles.AddUserToRole(UserName, "user_tl");
                    Role = "user_tl";
                }
            }
            if ((Company != "OurCompany" || Company != "OurCompany, Inc.") && PartsList == "")
            {
                if (!User.IsInRole("user"))
                {
                    Roles.AddUserToRole(UserName, "user");
                    Role = "user";
                }
            }

            ////Get your Connection String from the web.config...ApplicationServices is the name I have in my web.config
            string connectionString = ConfigurationManager.ConnectionStrings["ApplicationServices"].ConnectionString;
            string insertSql = "INSERT INTO UserProfile(FirstName, LastName, Company, PartsList, UserName, Password, Email, Question, Answer, Role)" +
                               "VALUES(@FirstName, @LastName, @Company, @Partslist, @UserName, @Password, @Email, @Question, @Answer, @Role)";

            using (SqlConnection myConnection = new SqlConnection(connectionString))
            {
                myConnection.Open();
                SqlCommand myCommand = new SqlCommand(insertSql, myConnection);
                myCommand.Parameters.AddWithValue("@FirstName", FirstName);
                myCommand.Parameters.AddWithValue("@LastName", LastName);
                myCommand.Parameters.AddWithValue("@Company", Company);
                myCommand.Parameters.AddWithValue("@PartsList", PartsList);
                myCommand.Parameters.AddWithValue("@UserName", UserName);
                myCommand.Parameters.AddWithValue("@Password", Password);
                myCommand.Parameters.AddWithValue("@Email", Email);
                myCommand.Parameters.AddWithValue("@Question", Question);
                myCommand.Parameters.AddWithValue("@Answer", Answer);
                myCommand.Parameters.AddWithValue("@Role", Role);

                myCommand.ExecuteNonQuery();
                myConnection.Close();                    
            }
    }

我喜欢做一些你看不到明显的事情…谢谢！现在我得到一个错误——参数化查询“（@FirstName-nvarchar（6），@LastName-nvarchar（9），@Company-nvarchar”（“需要参数“@UserRole”），但没有提供。我是否需要添加类似以下内容：myCommand.Parameters.AddWithValue（@FirstName”，SqlDbType.nvarchar，FirstName）；其中SqlDbType与数据库中的实际数据类型匹配？是否UserRole
包含值或为null？如果允许null值，则将DBNull.value
作为参数值放入。UserRole应在代码中之前为If赋值。在数据库表中，不允许null值。是否确定参数ter设置是否正确？您应该在执行命令之前调试它和/或转储所有参数。我认为在某些情况下，UserRole
可以包含空值。我刚才注意到的一件事是，在我的表中，最后一列是“Role”，我试图分配一个“UserRole”，但是我还是收到了一个错误消息。在执行命令之前，我如何检查参数并将其全部转储？我一定很喜欢做一些你看不到明显的东西…谢谢！现在我收到了一个错误-参数化查询“（@FirstName nvarchar（6），@LastName nvarchar（9），@Company nvarchar（'需要未提供的参数'@UserRole'。是否需要添加类似以下内容：myCommand.Parameters.AddWithValue（“@FirstName”，SqlDbType.NVarChar，FirstName）；其中SqlDbType与数据库中的实际数据类型匹配？是否UserRole
包含值或为null？如果允许null值，则将DBNull.value
作为参数值放入。UserRole应在代码中之前为If赋值。在数据库表中，不允许null值。是否确定参数ter设置是否正确？您应该在执行命令之前调试它和/或转储所有参数。我认为在某些情况下，UserRole
可以包含空值。我刚才注意到的一件事是，在我的表中，最后一列是“Role”，我试图分配一个“UserRole”，但我仍然收到一条错误消息。如何在执行命令之前检查参数并将其全部转储？