DataGridViewComboBoxCell valueValue 对绑定的 DataGridViewComboBoxCell 无效

Question

我有一个带有两个 DataGridViewComboBoxCell 的 DatagridView：

管理
员工。

我想做的是当我 select 从 1st

开始管理

DataGridViewComboBoxCell，我将获取 selected

的员工列表

第二个 DataGridViewComboBoxCell 中的管理。我绑定了第一个

DataGridViewComboBoxCell 手动添加到 administrationBindingSource，我试过了

this answer code，这是我使用的代码：

dataGridView1.CellValueChanged += new DataGridViewCellEventHandler(dataGridView1_CellValueChanged);
dataGridView1.CurrentCellDirtyStateChanged += new EventHandler(dataGridView1_CurrentCellDirtyStateChanged);

void dataGridView1_CurrentCellDirtyStateChanged(object sender, EventArgs e)
    {
        if (dataGridView1.IsCurrentCellDirty)
        {
            // This fires the cell value changed handler below
            dataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit);
        }
    }

private void dataGridView1_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
    if (e.RowIndex == -1)
    {
        return;
    }

    DataGridViewComboBoxCell cb = (DataGridViewComboBoxCell)dataGridView1.CurrentRow.Cells["administrationColumn"];
    int item = 0;
    if (cb.Value != null)
    {
        item = (Int32)cb.Value;
        selectEmployee(item);
        dataGridView1.Invalidate();
    }

}
private void selectEmployee(int idAdministration)
{
    if (con.State != ConnectionState.Open)
    {
        con.Open();
    }
    SqlCommand Cmd = new SqlCommand("SELECT * FROM Employee WHERE IdAdministration = @idAdministration", con);
    Cmd.Parameters.AddWithValue("@idAdministration", idAdministration);
    DataTable Dt = new DataTable();
    Dt.Load(Cmd.ExecuteReader());
    DataGridViewComboBoxCell cb = (DataGridViewComboBoxCell)dataGridView1.CurrentRow.Cells["Employee"];
    cb.DataSource = Dt;
    cb.DisplayMember = "Name";
    cb.ValueMember = "CodeEmployee";
    con.Close();
}

此代码第一次运行良好，但当我尝试更新管理值时，我收到此错误消息：

DataGridViewComboBoxCell value is invalid

如何解决？

Answer 1

尝试清除员工单元格的值，然后再将其重新绑定到 void

"selectEmployee"，类似于：

private void selectEmployee(int idAdministration)
{
    if (con.State != ConnectionState.Open)
    {
        con.Open();
    }
    SqlCommand Cmd = new SqlCommand("SELECT * FROM Employee WHERE IdAdministration = @idAdministration", con);
    Cmd.Parameters.AddWithValue("@idAdministration", idAdministration);
    DataTable Dt = new DataTable();
    Dt.Load(Cmd.ExecuteReader());
    DataGridViewComboBoxCell cb = (DataGridViewComboBoxCell)dataGridView1.CurrentRow.Cells["Employee"];
    cb.Value = null; //add this
    cb.DataSource = Dt;
    cb.DisplayMember = "Name";
    cb.ValueMember = "CodeEmployee";
    con.Close();
}

DataGridViewComboBoxCell valueValue 对绑定的 DataGridViewComboBoxCell 无效

DataGridViewComboBoxCell valueValue is invalid with binded DataGridViewComboBoxCell

c#

argumentexception

datagridviewcomboboxcell