Question

所以我打算在双击datagridview中的数据/单元格时创建一个电话簿，将会有第二个表单（详细信息表单），它将显示该id的所有其他详细信息，并且数据应该出现在文本框但它不起作用。所以这是我的代码。谢谢！。

private void dataGridView1_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
{

    int id;
    id = dataGridView1.CurrentCell.RowIndex;
    Details details = new Details(id);
    details.Show();

}

详见页面

public Details(int id)
{
  InitializeComponent();
  int val = id;
  GetRecords(val);
}

private void GetRecords(int n) 
{
  SqlCommand cmd = new SqlCommand();
  int id = n;
  cmd.Connection = cn;
  cmd.CommandType = CommandType.Text;
  cmd.CommandText = "SELECT * FROM Employee WHERE EmployeeID ='" + id + "';";

  da = new SqlDataAdapter();
  da.SelectCommand = cmd;

  ds = new DataSet();
  da.Fill(ds, "Employee");
}

private void AddDataBinding()
{
  txtLN.DataBindings.Add("Text", ds, "Employee.LastName");
  txtFN.DataBindings.Add("Text", ds, "Employee.FirstName");
  txtMN.DataBindings.Add("Text", ds, "Employee.MiddleName");
  txtAddress.DataBindings.Add("Text", ds, "Employee.Address");
  txtAge.DataBindings.Add("Text", ds, "Employee.Age");
  txtLN.DataBindings.Add("Text", ds, "Employee.LastName");
  txtPhone.DataBindings.Add("Text", ds, "Employee.Phone");
  txtMobile.DataBindings.Add("Text", ds, "Employee.Mobile");
  txtEmail.DataBindings.Add("Text", ds, "Employee.Email");
  dtBirthday.DataBindings.Add("Value", ds, "Employee.Birthday");
  cbType.DataBindings.Add("SelectedItem", ds, "Employee.Type");
  txtName.DataBindings.Add("Text", ds, "Employee.OtherName");
  txtOPhone.DataBindings.Add("Text", ds, "Employee.OtherPhone");
  txtOMobile.DataBindings.Add("Text", ds, "Employee.OtherMobile");
}

Answer 1

1-你应该找到id而不是row index。您应该知道哪个列索引是id，例如，如果您的id在第一列，您可以使用：

var id = (int)dataGridView1.Rows[e.RowIndex].Cells[0].Value;

2-考虑使用这样的参数化查询：

cmd.CommandText = "SELECT * FROM Employee WHERE EmployeeID =@Id";
cmd.Parameters.AddWithValue("@Id", id);
//cmd.Parameters.Add("@Id", SqlDbType.Int).Value = id;

3-按照Ivan所述的方式执行数据绑定，并调用AddDataBinding

DataTable dt;

private void GetRecords(int n) 
{
    //...
    da.Fill(ds, "Employee");
    dt = ds.Tables["Employee"];
    AddDataBinding();
}

private void AddDataBinding()
{
    txtLN.DataBindings.Add("Text", dt, "LastName");
    txtFN.DataBindings.Add("Text", dt, "FirstName");
    // ...
}

Answer 2

首先，以下代码id = dataGridView1.CurrentCell.RowIndex;闻起来，确保您确实获得了emplyeee Id值。

其次，WinForms数据绑定不支持＆＃34; path＆＃34; （如＆＃34; Employee.LastName＆＃34;）作为WPF。为了实现目标，您需要绑定到DataTable，如下所示：

DataTable dt;

private void GetRecords(int n) 
{
    //...
    da.Fill(ds, "Employee");
    dt = ds.Tables["Employee"];
}

private void AddDataBinding()
{
    txtLN.DataBindings.Add("Text", dt, "LastName");
    txtFN.DataBindings.Add("Text", dt, "FirstName");
    // ...
}

winform中的数据绑定错误c＃

2 个答案: