C# combobox数据源绑定会影响由相同数据集设置的combobox的其他实例

我有三个不同的组合框，我通过datasource分配相同的值，但每次选择更改都会影响其他实例。如何避免这种情况

private void getVendorList()
{
  DataTable data = this.vendorService.GetAllVendors();
  this.LoadDataGridView(data);

  //set vendor combobox datasource
  comboAddProdVendorId.DataSource = data;
  comboAddProdVendorId.ValueMember = "Id";
  comboAddProdVendorId.DisplayMember = "Name";

  comboSearchProdVendorId.DataSource = data;
  comboSearchProdVendorId.ValueMember = "Id";
  comboSearchProdVendorId.DisplayMember = "Name";


  comboAddTransacVendorId.DataSource = data;
  comboAddTransacVendorId.ValueMember = "Id";
  comboAddTransacVendorId.DisplayMember = "Name";
}

---

在分配给数据源之前，您需要复制数据表。
试试这个：

private void getVendorList()
{
  DataTable data = this.vendorService.GetAllVendors();
  this.LoadDataGridView(data);

  //set vendor combobox datasource
  comboAddProdVendorId.DataSource = data.Copy();
  comboAddProdVendorId.ValueMember = "Id";
  comboAddProdVendorId.DisplayMember = "Name";

  comboSearchProdVendorId.DataSource = data.Copy();
  comboSearchProdVendorId.ValueMember = "Id";
  comboSearchProdVendorId.DisplayMember = "Name";


  comboAddTransacVendorId.DataSource = data.Copy();
  comboAddTransacVendorId.ValueMember = "Id";
  comboAddTransacVendorId.DisplayMember = "Name";
}