Question

我不知道我的代码有什么问题，我真的需要这个项目的帮助。当我运行它时，它会搜索数据库，但只显示空行字段。此外，我有一个函数在表单启动时将数据加载到DGV LoadData()。

private void bx_Search_TextChanged(object sender, EventArgs e)
{
    string ss = bx_Search.Text;
    SqlConnection con = new SqlConnection("Data Source=GH0ST;Initial Catalog=InventoryProjectDB;Integrated Security=True");

    con.Open();
    SqlDataAdapter sda = new SqlDataAdapter("SELECT * FROM PRODUCT WHERE PNAME LIKE '%" + ss + "%'", con);
    DataTable dt = new DataTable();
    sda.Fill(dt);
    dataGridView1.DataSource = dt;
    con.Close();


}

LoadData

public void LoadData()    
        {
            SqlConnection con = new SqlConnection("Data Source=GH0ST;Initial Catalog=InventoryProjectDB;Integrated Security=True");
            SqlDataAdapter sda = new SqlDataAdapter(@"SELECT * FROM [dbo].[PRODUCT]", con);
            DataTable dt = new DataTable();
            sda.Fill(dt);
            dataGridView1.Rows.Clear();
            foreach (DataRow item in dt.Rows)
            {
                int ar = dataGridView1.Rows.Add();
                dataGridView1.Rows[ar].Cells[0].Value = item["PID"].ToString();
                dataGridView1.Rows[ar].Cells[1].Value = item["PName"].ToString();
                dataGridView1.Rows[ar].Cells[2].Value = item["PPrice"].ToString();
                if ((bool)item["PStatus"])

                    dataGridView1.Rows[ar].Cells[3].Value = "In Stock";
                }
                else
                {
                    dataGridView1.Rows[ar].Cells[3].Value = "Out of Stock";
                }
                dataGridView1.Rows[ar].Cells[4].Value = item["PQTY"].ToString();
                dataGridView1.Rows[ar].Cells[5].Value = item["PDateAdded"].ToString();
            }
        }
private void MAIN_Load(object sender, EventArgs e)
        {
            LoadData();
        }

IMG1 IMG2

Answer 1

我认为您可能缺少DataGridView.Refresh（）来刷新布局。

private void bx_Search_TextChanged(object sender, EventArgs e)
{
    string ss = bx_Search.Text;
    SqlConnection con = new SqlConnection("Data Source=GH0ST;Initial Catalog=InventoryProjectDB;Integrated Security=True");

    con.Open();
    SqlDataAdapter sda = new SqlDataAdapter("SELECT * FROM PRODUCT WHERE PNAME LIKE '%" + ss + "%'", con);
    DataTable dt = new DataTable();
    sda.Fill(dt);
    dataGridView1.DataSource = dt;
    dataGridView1.Refresh();
    con.Close();
}

我想从textchanged事件

1 个答案: