Question

我有一个问题，我不知道问题所在。当我输入详细信息并点击我的REGISTER页面上的提交按钮时，我的视觉工作室会抛出异常。我不知道问题出在我的SQL查询中还是我的代码。所以我发布了两个

这是我的Sql查询：

        Create proc spRegisteredUsers

        @Name nvarchar(100),
        @UserName nvarchar(100),
        @Password nvarchar(200),
        @ContactNo int,
        @Email nvarchar(200)
         as
        Begin

       Declare @Count int
       Declare @ReturnCode int

       Select @Count = COUNT(UserName)
       from tblRegisteredUsers where UserName=@UserName
       if @Count>0
       Begin
       Set @ReturnCode= -1
       End
       Else
       Begin
       Set @ReturnCode= 1
       Insert into tblRegisteredUsers values(@Name,@UserName,@Password,@ContactNo,@Email)
       End
       Select @ReturnCode as ReturnValue
        End

虽然我在下面的行中得到例外：

           protected void btnRegSubmit_Click(object sender, EventArgs e)
          {
         if (Page.IsValid)
          {
          string CS = ConfigurationManager.ConnectionStrings["AK"].ConnectionString;
           using (SqlConnection con = new SqlConnection(CS))
           {
            SqlCommand cmd = new SqlCommand("spRegisteredUsers", con);
            cmd.CommandType = CommandType.StoredProcedure;

            SqlParameter Name = new SqlParameter("@Name", txtRegName.Text);
            SqlParameter UserName = new SqlParameter("@UserName", txtRegUsername.Text);
            SqlParameter Password = new SqlParameter("@Password", txtRegPassword.Text);
            SqlParameter ContactNo = new SqlParameter("@ContactNo", txtRegContact.Text);
            SqlParameter Email = new SqlParameter("@Email", txtRegEmail.Text);

            cmd.Parameters.Add(Name);
            cmd.Parameters.Add(UserName);
            cmd.Parameters.Add(Password);
            cmd.Parameters.Add(ContactNo);
            cmd.Parameters.Add(Email);

            con.Open();
            int ReturnCode = Convert.ToInt32(cmd.ExecuteScalar().ToString());
            if (ReturnCode == -1)
            {
                lblMessage.Text = "UserName already exists.";
            }
            else
            {
                Response.Redirect("~/Login.aspx");
            }
        }
    }

}

我看到一个有趣的事情。当我从表，存储过程和cs代码中删除Name和ContactNo字段时.IT WORKS。

Answer 1

试试这个：

 using (SqlConnection con = new SqlConnection(CS))
           {
            SqlCommand cmd = new SqlCommand("spRegisteredUsers", con);
            cmd.CommandType = CommandType.StoredProcedure;
            //use long instead...
            long Contact = Convert.ToInt64(txtRegContact.Text); //convert to long here 

            SqlParameter Name = new SqlParameter("@Name", txtRegName.Text);
            SqlParameter UserName = new SqlParameter("@UserName", txtRegUsername.Text);
            SqlParameter Password = new SqlParameter("@Password", txtRegPassword.Text);

            SqlParameter ContactNo = new SqlParameter("@ContactNo", Contact);

            SqlParameter Email = new SqlParameter("@Email", txtRegEmail.Text);
            ......

您正在传递一个字符串，SQL Procedure需要int为ContactNo。

Answer 2

你可能会在第一行收到错误。试试这个：

int ReturnCode = Convert.ToInt32(cmd.ExecuteScalar().ToString());

将数据类型nvarchar转换为int时出错

2 个答案: