我正在尝试创建注册页面，但遇到了其他错误！ 我想要实现的是将用户输入的代码传输到数据库中。 但是，由于单击提交按钮后遇到错误，我无法实现我想要的目标。 任何帮助将不胜感激！
Error Message:
Error:System.Data.SqlClient.SqlException (0x80131904): Error converting data type nvarchar to numeric. at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at Registration.submitButton_Click(Object sender, EventArgs e) in d:\Desktop\TemporarySter\Registration.aspx.cs:line 80 ClientConnectionId:c3fd51e0-9dc7-49ba-ab88-313267504802
我的SQL数据库代码
CREATE TABLE [dbo].[Client] (
[ClientNo] INT IDENTITY (1, 1) NOT NULL,
[cFirstName] NCHAR (10) NOT NULL,
[cLastName] NCHAR (50) NOT NULL,
[cD.O.B] DATE NOT NULL,
[cCompanyName] NVARCHAR (255) NOT NULL,
[cAddress] NVARCHAR (255) NOT NULL,
[cCity] NVARCHAR (255) NOT NULL,
[cZipCode] NCHAR (10) NOT NULL,
[cPhoneNo] NUMERIC (18) NOT NULL,
[cFax] NUMERIC (18) NOT NULL,
[cEmail] NVARCHAR (MAX) NOT NULL,
[cUsername] NVARCHAR (50) NOT NULL,
[cPassword] NVARCHAR (50) NOT NULL,
CONSTRAINT [PK_Client] PRIMARY KEY CLUSTERED ([ClientNo] ASC)
);
我的注册页面的aspx.cs代码
using System;
using System.Configuration;
using System.Data;
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;
public partial class Registration : System.Web.UI.Page
{
static readonly string scriptErrorUsername =
"<script language =\"javascript\">\n" +
"alert (\"Error - Username is already taken! Please key in another Username\");\n" +
"</script>";
static readonly string scriptSuccessNewAccount =
"<script language=\"javascript\">\n" +
"alert (\"Your account has been successfully created - Thank You!\");\n" +
"</script>";
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
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();
string checkuser = "select count(*) from Client where cUserName= '" + userTB.Text + "'";
SqlCommand com = new SqlCommand(checkuser, conn);
int temp = Convert.ToInt32(com.ExecuteScalar().ToString());
if (temp == 1)
{
Response.Write("Username is already taken! Please choose another username.");
}
conn.Close();
}
}
protected void submitButton_Click(object sender, EventArgs e)
{
try
{
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 strSQLSelect = "SELECT cUsername FROM Client ORDER BY cUsername";
com = new SqlCommand(strSQLSelect, conn);
rdr = com.ExecuteReader();
while (rdr.Read() == true)
{
if (userTB.Text == (string)rdr["cUsername"])
{
ClientScript.RegisterStartupScript(csType, "Error", scriptErrorUsername);
conn.Close();
rdr.Close();
return;
}
}
string insertQuery = "insert into Client (cFirstName, cLastName, [cD.O.B], cCompanyName, cAddress, cCity, cZipCode, cPhoneNo, cFax, cEmail, cUsername, cPassword) values (@firstname,@lastname,@dob,@companyname,@address,@city,@zipcode,@phoneno,@fax,@email,@username,@password)";
com = new SqlCommand(insertQuery, conn);
com.Parameters.AddWithValue("@firstname", firstnameTB.Text);
com.Parameters.AddWithValue("@lastname", lastnameTB.Text);
com.Parameters.AddWithValue("@dob", dateTB.Text.ToString());
com.Parameters.AddWithValue("@companyname", companyTB.Text);
com.Parameters.AddWithValue("@address", addressTB.Text);
com.Parameters.AddWithValue("@city", cityTB.Text);
com.Parameters.AddWithValue("@zipcode", postalcodeTB.Text);
com.Parameters.AddWithValue("@phoneno", contactnumberTB.Text.ToString());
com.Parameters.AddWithValue("@fax", faxTB.Text.ToString());
com.Parameters.AddWithValue("@email", emailTB.Text);
com.Parameters.AddWithValue("@username", userTB.Text);
com.Parameters.AddWithValue("@password", passTB.Text);
com.ExecuteNonQuery();
Response.Redirect("ClientLogin.aspx");
Response.Write("Congratulations! Your registration is successful!");
ClientScript.RegisterStartupScript(csType, "Success", scriptSuccessNewAccount);
conn.Close();
}
catch (Exception ex)
{
Response.Write("Error:" + ex.ToString());
}
}
protected void resetButton_Click(object sender, EventArgs e)
{
Response.Redirect("~/Registration.aspx", true);
}
}
答案 0 :(得分：3)
您将电话号码声明为数字字段，因此您需要将文本转换为整数
[cPhoneNo] NUMERIC (18) NOT NULL
[cFax] NUMERIC (18) NOT NULL
像这样使用：
com.Parameters.AddWithValue("@phoneno", Convert.ToInt32(contactnumberTB.Text));
com.Parameters.AddWithValue("@fax", Convert.ToInt32(faxTB.Text));
答案 1 :(得分：1)
电话号码值是cs中的字符串：
com.Parameters.AddWithValue("@phoneno", contactnumberTB.Text.ToString());
在你的表中，它是数字：
[cPhoneNo] NUMERIC (18) NOT NULL,
[编辑：] 您应该更新表中的数据类型。
答案 2 :(得分：1)
在代码中进行以下更改
com.Parameters.AddWithValue("@phoneno", Convert.ToDouble(contactnumberTB.Text.ToString()));
com.Parameters.AddWithValue("@@fax", Convert.ToDouble(faxTB..Text.ToString()));
您需要进行更改，因为您尝试在数字字段中插入字符串值。 通过定义这个，您在db中声明以下字段是数字的，因此应用程序将失败并返回字符串值。这就是为什么需要进行上述更改才能使数值加倍。
[cPhoneNo] NUMERIC (18) NOT NULL,
[cFax] NUMERIC (18) NOT NULL,