将[数据类型] nvarchar转换为整数时出错

Question

我有一个允许用户插入其详细信息的应用程序。但是我收到了一个错误。我已经尝试过StackOverflow或任何其他博客上提供的解决方案。

这是c＃代码。

if (Page.IsValid)
    {

        string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;

        using (SqlConnection con = new SqlConnection(CS))
        {
            SqlCommand cmd = new SqlCommand("spRegisterUser", con)
            {
                CommandType = CommandType.StoredProcedure
            };

            SqlParameter username = new SqlParameter("@UserName", txtUserName.Text);

            string encryptedPassword = FormsAuthentication.HashPasswordForStoringInConfigFile(txtPassword.Text, "SHA1");
            SqlParameter password = new SqlParameter("@Password", encryptedPassword);
            SqlParameter email = new SqlParameter("@Email", txtEmail.Text);
            SqlParameter mobileno = new SqlParameter("@MobileNo", txtMobileNo.Text);

            cmd.Parameters.Add(username);
            cmd.Parameters.Add(password);
            cmd.Parameters.Add(email);
            cmd.Parameters.Add(mobileno);
            con.Open();

            int ReturnCode = (int)cmd.ExecuteScalar();
            if (ReturnCode == -1)
            {
                lblMessage.Text = "User Name already in use, please choose another user name";
            }
            else
            {
                Response.Write("Login Successfully");
                //Response.Redirect("~/Login.aspx");
            }
        }
    }
}

这是存储过程

create proc spRegisterUser  
@UserName nvarchar(100),  
@Password nvarchar(200),  
@Email nvarchar(200),  
@MobileNo int

 declare @count int  
 declare @returncode int  

 --declare @count1 int  
 --declare @returncode1 int  

 select @count = count(username)  
 from tblUser where UserName=@UserName  
 if @count>0  
 begin   
 set @returncode = -1  
 end  
 else  
 begin   
 set @returncode=1  

 insert into tblUser values(@UserName,@Password,@Email,@MobileNo)  
 End  
 select @returncode as ReturnValue  
 End  

这是堆栈跟踪

     [SqlException (0x80131904): Error converting data type nvarchar to int.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +2551578
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5951128
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +285
   System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +4169
   System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() +58
   System.Data.SqlClient.SqlDataReader.get_MetaData() +89
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString, Boolean isInternal, Boolean forDescribeParameterEncryption, Boolean shouldCacheForAlwaysEncrypted) +430
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest) +2598
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) +1483
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +64
   System.Data.SqlClient.SqlCommand.ExecuteScalar() +271
   Project.WebForm2.btnSubmit_Click(Object sender, EventArgs e) in E:\Visual Studio 2012\Project\Project\Registration\SignUp.aspx.cs:54
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9782378
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +204
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +12
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1639

请尽快提供解决方案

Answer 1

问题是由于将值传递给您在存储过程中声明为整数的@MobileNo参数引起的。 在将值从txtMobileNo.Text传递给@MobileNo参数之前，您需要在代码中进行验证，该参数验证在文本框中输入的值是否为有效整数。

请参阅Int32.TryParse方法以验证文本是否为有效整数。

否则将存储过程中的@MobileNo参数声明为V A RCHAR，例如

create proc spRegisterUser  
@UserName nvarchar(100),  
@Password nvarchar(200),  
@Email nvarchar(200),  
@MobileNo VARCHAR(15)

--Rest of code