c# - Datagridview CellValueChanged 事件抛出 InvalidOperationException

Question

当我更改要更新的单元格值并直接单击菜单条项以打开新的 Winform 时，抛出 InvalidOperationException。

   private void dgv_category_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            DataTable dt = new DataTable();
            dt = u.operationOnDataBase(sqlquery_selectCategory, 3);
            if (dt.Rows.Count > 0)
            {
                MessageBox.Show("Category Already Exist...");

            }
            else
            {
                u.operationOnDataBase(sqlquery_UpdateCategory, 1);
                u.SyncMaster("update", "CategoryDetails", 0, Convert.ToInt32(dgv_category[1, e.RowIndex].Value.ToString()));//---------Sync
            }

            try
            {
                dgv_category.DataSource = null; //here Throwing exception

                u.operationOnDataBase(sqlquery, 3);
                dgv_category.DataSource = u.dt;


            }
            catch (InvalidOperationException)
            {
                // exception
            }
        }

Exception- Operation is not valid because it results in a reentrant call to the SetCurrentCellAddressCore function.

at System.Windows.Forms.DataGridView.SetCurrentCellAddressCore(Int32 columnIndex, Int32 rowIndex, Boolean setAnchorCellAddress, Boolean validateCurrentCell, Boolean throughMouseClick) at System.Windows.Forms.DataGridView.set_CurrentCell(DataGridViewCell value) at System.Windows.Forms.DataGridView.set_DataSource(Object value)

Answer 1

不是直接设置DataSource，而是将DataSource设置为BindingSource，然后更改BindingSource.DataSource？

例如

//create bindingSource in the WinForms Designer

然后...

try
{
   dgv_category.DataSource = null;
   dgv_category.Rows.Clear();
}
catch{}
bindingSource.DataSource = ut.dt;
dgv_category.DataSource = bindingSource;
bindingSource.ResetBindings(true);