在C＃中将值插入数据库中的表

Question

I have a Winforms application and database to save data from user.

When I insert data everything works fine but when I clean the solution and load the GUI of the database to see the old data.. I don't see the datam the datagridview is empty.

using (SqlConnection con = new SqlConnection(dataBase.Connection.ConnectionString))
{
   using (SqlCommand wow = new SqlCommand("insert into GamesTbl(Type,Date,Time) Values(@type,@date,@time)", con))
   {
      wow.Parameters.AddWithValue("@type", "vsPC");
      wow.Parameters.AddWithValue("@date", DateTime.Now.Date);
      wow.Parameters.AddWithValue("@time", DateTime.Now.TimeOfDay);

      try
      {
          con.Open();
          wow.ExecuteNonQuery();
          con.Close();
      }
      catch (Exception ex)
      {
         MessageBox.Show(ex.Message);
      }
   }
}

What is wrong?

EDIT: binding data on DBGui_load

private void DBGui_Load(object sender, EventArgs e)
    {
        dataGridView1.DataSource = playersTblBindingSource;
        playersTblBindingSource.DataSource = DB.GamesTbls;

    }

EDIT: my connection string:

"Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Database1.mdf;Integrated     
Security=True;User Instance=True"

Answer 1

The whole User Instance and AttachDbFileName= approach is flawed - at best! When running your app in Visual Studio, it will be copying around the .mdf file (to the output directory - typically .\\bin\\debug - where you app runs) and most likely , your INSERT works just fine - but you're just looking at the wrong .mdf file in the end!

If you want to stick with this approach, then try putting a breakpoint on the myConnection.Close() call - and then inspect the .mdf file with SQL Server Mgmt Studio Express - I'm almost certain your data is there.

The real solution in my opinion would be to

1. install SQL Server Express (and you've already done that anyway)

2. install SQL Server Management Studio Express

3. create your database in SSMS Express , give it a logical name (eg Database1 - or while you're at it - give it a more sensible name...)

4. connect to it using its logical database name (given when you create it on the server) - and don't mess around with physical database files and user instances. In that case, your connection string would be something like:

    Data Source=.\\\\SQLEXPRESS;Database=YourDatabase;Integrated Security=True 

   and everything else is exactly the same as before...

Answer 2

Seems liks you are missing DataBind .

private void DBGui_Load(object sender, EventArgs e)
{
    dataGridView1.DataSource = playersTblBindingSource;
    dataGridView1.DataBind(); // you are missing this
    playersTblBindingSource.DataSource = DB.GamesTbls;
}

Answer 3

As an alternative solution, what you can do to fix the problem is to set the property of your database file in your solution as follows

Copy To Output Directory : do not copy