C# 按钮单击事件时，将数据从DB显示到datagrid视图的预定义列时出错

我正在使用以下代码：

string getinputs = "SELECT ir.plu_code PLU_Code,ir.barcode Barcode,ir.product_name Product_Name  FROM inventory_register ir,inventory_value iv WHERE ir.dept_id='" + textBox1.Text + "' AND ir.barcode = iv.barcode";
connection.Open();
MySqlDataAdapter adapter = new MySqlDataAdapter(getinputs, connection);
MySqlCommandBuilder cmdbuilder = new MySqlCommandBuilder(adapter);
DataTable dt = new DataTable();
adapter.Fill(dt);
BindingSource bindsrc = new BindingSource();
DataGridView datagridv = new DataGridView();
bindsrc.DataSource = dt;
datagridv.DataSource = bindsrc;
connection.Close();

我在

datagridview1

中有三个预定义的列，分别是“

PLU\u code

”、“

Barcode

”和“

Product\u Name

”

我想在datagridview中显示select查询的结果（多行）。但我没有得到任何

我如何做到这一点

请尝试以下代码：

                string getinputs = "SELECT ir.plu_code PLU_Code,ir.barcode Barcode,ir.product_name Product_Name  FROM inventory_register ir,inventory_value iv WHERE ir.dept_id='" + textBox1.Text + "' AND ir.barcode = iv.barcode";
                connection.Open();

                MySqlDataAdapter dataAdapter = new MySqlDataAdapter(getinputs, connection);
                MySqlCommandBuilder commandBuilder = new MySqlCommandBuilder(dataAdapter);
                DataTable table = new DataTable();
                dataAdapter.Fill(table);

                datagridview1.DataSource = table;

                connection.Close();

string getinputs = "Select Query";
connection.Open();

MySqlCommandBuilder cmdbuilder = new MySqlCommandBuilder(getinputs,connection);
MySqlDataAdapter adapter = new MySqlDataAdapter(cmdbuilder);

DataTable dt = new DataTable();
adapter.Fill(dt);

DataGridView datagridv = new DataGridView();
datagridv.DataSource = dt;

datagridv.DataBind();

connection.Close();

请尝试以下代码：

                string getinputs = "SELECT ir.plu_code PLU_Code,ir.barcode Barcode,ir.product_name Product_Name  FROM inventory_register ir,inventory_value iv WHERE ir.dept_id='" + textBox1.Text + "' AND ir.barcode = iv.barcode";
                connection.Open();

                MySqlDataAdapter dataAdapter = new MySqlDataAdapter(getinputs, connection);
                MySqlCommandBuilder commandBuilder = new MySqlCommandBuilder(dataAdapter);
                DataTable table = new DataTable();
                dataAdapter.Fill(table);

                datagridview1.DataSource = table;

                connection.Close();

string getinputs = "Select Query";
connection.Open();

MySqlCommandBuilder cmdbuilder = new MySqlCommandBuilder(getinputs,connection);
MySqlDataAdapter adapter = new MySqlDataAdapter(cmdbuilder);

DataTable dt = new DataTable();
adapter.Fill(dt);

DataGridView datagridv = new DataGridView();
datagridv.DataSource = dt;

datagridv.DataBind();

connection.Close();

---

我得到了结果。我使用@user4340666代码实现了两个空行。当我滚动网格时，我发现数据集被添加为新列，而预定义的列单元格为空。所以我只是清理了这些柱子

            dataGridView1.Columns.Clear();
            string getinputs = "SELECT ir.plu_code PLU_Code,ir.barcode Barcode,ir.product_name Product_Name  FROM inventory_register ir,inventory_value iv WHERE ir.dept_id='" + textBox1.Text + "' AND ir.barcode = iv.barcode";
            connection.Open();

            MySqlDataAdapter dataAdapter = new MySqlDataAdapter(getinputs, connection);
            MySqlCommandBuilder commandBuilder = new MySqlCommandBuilder(dataAdapter);
            DataTable table = new DataTable();
            dataAdapter.Fill(table);

            datagridview1.DataSource = table;

            connection.Close();

---

离题，但：您的代码易受SQL注入攻击。问题是，当我单击按钮时，DataGridView中没有显示行。您确定在执行adpter.Fille（dt）时获得了一些数据吗？@Stefan您的意思是流错误>/没有显示数据@Fabrichi。select查询的结果是两行。在尝试了你的代码之后，我在datagridview中得到了两个空行（单元格中没有数据）好的，尝试在SQL语句中使用参数，意思是说“cmd.parameters.add”？