sql查询以检索特定主键的名称

问题描述

public partial class EnterResults : Form
    {

        SqlConnection dbConnection;
        SqlCommand dbCommand;
        DataSet dsResults;
        SqlDataAdapter dbAdapter;

        public EnterResults()
        {
            InitializeComponent();
        }

        private void EnterResults_Load(object sender, EventArgs e)
        {
            dbConnection = new SqlConnection("Initial Catalog = Rugby_World_Cup; Data Source = localhost; Integrated Security= True");

            dbCommand = new SqlCommand("SELECT * FROM Game", dbConnection);
            dbAdapter = new SqlDataAdapter(dbCommand);
            dsResults = new DataSet();
            dbAdapter.Fill(dsResults, "Result");
            cboGameID.DataSource = dsResults.Tables["Result"];
           cboGameID.DisplayMember = "GameId";
                     cboGameID.SelectedIndex = -1;



        }

        private void btnEnter_Click(object sender, EventArgs e)
        {
            if (dbConnection.State == ConnectionState.Closed)
            {
                dbConnection.Open();
            }

            dbCommand = new SqlCommand("EnterGame", dbConnection);
            dbCommand.CommandType = CommandType.StoredProcedure;

            dbCommand.Parameters.AddWithValue("@GameID", cboGameID.SelectedValue.ToString());
            dbCommand.Parameters.AddWithValue("@CountryID", cboCountryID.SelectedValue.ToString());
            dbCommand.Parameters.AddWithValue("@Tries", txtTries.Text);
            dbCommand.Parameters.AddWithValue("@Penalty", txtPenalties.Text);
            dbCommand.Parameters.AddWithValue("@DropG", txtDropGoals.Text);
            dbCommand.Parameters.AddWithValue("@Points", txtPoints.Text);

            if (dbCommand.ExecuteNonQuery() > 0)
            {
                MessageBox.Show("Results where Entered");
            }
            cboGameID.SelectedIndex = -1;
            cboCountryID.SelectedIndex = -1;
            txtDropGoals.Clear();
            txtPenalties.Clear();
            txtPoints.Clear();
            txtTries.Clear();
            cboGameID.Focus();

        }

        private void cboGameID_SelectedIndexChanged(object sender, EventArgs e)
        {

    
            
                dbCommand = new SqlCommand("Select * from game", dbConnection);
                dbCommand.Parameters.AddWithValue("@ID",cboGameID.SelectedValue.ToString());
                dbAdapter = new SqlDataAdapter(dbCommand);
                dsResults = new DataSet();
                dbAdapter.Fill(dsResults, "enter");
                cboCountryID.DataSource = dsResults.Tables["enter"];
                cboCountryID.DisplayMember = "CountryId";
                           cboCountryID.SelectedIndex = -1;
            
        }
    }
}

推荐答案

var GamenName = from game in dbContext.Games
                where game.CountryId == cboCountryID.SelectedIndex.ToString()
                select game.name;

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