c# - SQL 服务器错误 : ExecuteNonQuery: Connection property has not been initialized

Question

我正在尝试使用 ASP.Net 和 C# 开发示例注册页面。我正在调用存储过程将数据插入数据库。我的数据库是 SQL Server 2008。

这是我的代码:

public partial class Sample : System.Web.UI.Page
{
   SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnection"].ToString());
   string str;

protected void Page_Load(object sender, EventArgs e)
{
    rbt_Male.Checked = true;
}

protected void btn_Submit_Click(object sender, EventArgs e)
{
    string @Name = txtbx_Name.Text;
    string @Gender_male = rbt_Male.Text;
    string @Gender_Female = rbt_Female.Text;
    string @Email = txtbx_Email.Text;
    DateTime @Dob = Convert.ToDateTime(txt_Dob.Text);
    submitdata();
}

protected void submitdata()
{
    try
    {
        SqlCommand cmd = new SqlCommand();
        cmd.Parameters.Clear();
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.CommandText = "insertdata";

        if (rbt_Male.Checked)
        {
            cmd.Parameters.AddWithValue("@Name", txtbx_Name.Text);
            cmd.Parameters.AddWithValue("@Gender_Male", rbt_Male.Text);
            cmd.Parameters.AddWithValue("@Email", txtbx_Email.Text);
            cmd.Parameters.AddWithValue("@Dob", Convert.ToDateTime(txt_Dob.Text));
        }
        else if (rbt_Female.Checked)
        {
            cmd.Parameters.AddWithValue("@Name", txtbx_Name.Text);
            cmd.Parameters.AddWithValue("@Gender_Female", rbt_Male.Text);
            cmd.Parameters.AddWithValue("@Email", txtbx_Email.Text);
            cmd.Parameters.AddWithValue("@Dob", Convert.ToDateTime(txt_Dob.Text));
        }

        if (con.State == ConnectionState.Closed)
            con.Open();

        cmd.ExecuteNonQuery();

        lbl_Errormsg.Visible = true;
        lbl_Errormsg.Text = "Record Inserted Successfully";
        con.Close();
    }
    catch (Exception ex)
    {
        lbl_Errormsg.Visible = true;
        lbl_Errormsg.Text = ex.Message;
    }

我收到错误信息

ExecuteNonQuery: Connection property has not been initialized.

我在 cmd.ExecuteNonQuery(); 处收到此错误

请帮帮我。

我的存储过程是

ALTER Procedure insertdata
(
 @Name Varchar(20),
 @Gender Varchar(6),
 @Email Varchar(20),
 @Dob date
) 
As
 Begin
   Insert into samplelogintable (Name, Gender, Email, Dob)
   Values(@Name, @Gender, @Email, @Dob)
 End

Answer 1

您还没有将您的命令 cmd 与您的 SqlConnection 相关联，这就是您收到错误的原因。

您需要指定:

cmd.Connection = con;

在您的 submitdata() 方法中。

由于 SqlCommand 实现了 IDisposable ，如果你在 using block 中使用它会更好，比如:

using (SqlCommand cmd = new SqlCommand())
{

    cmd.Parameters.Clear();
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.CommandText = "insertdata";
    cmd.Connection = con;
    .... your code

}