Question

我是实体框架的新手，我正在研究数据库的第一个场景。我正在处理示例crud操作，我想删除详细信息视图中的当前对象。

目前我只能删除视图中的第一个对象

private void btnDelete_Click(object sender, RoutedEventArgs e)
{
    Branch delBranch = null;

    if (muTime.Branches.Count() > 0)
    {
        delBranch = muTime.Branches.First();
    }
    else
    {
        MessageBox.Show("No Records to delete");
        return;
    }

    muTime.Branches.Remove(delBranch);
    muTime.SaveChanges();
    MessageBox.Show("Deleted " + muTime.Branches.ToString());
    branchViewSource.View.Refresh();
}

Answer 1

您需要将您想要的记录带入跟踪。您当前的代码总是要删除First（）分支。您需要识别指向要删除的分支的控件（网格？）或变量。

private void btnDelete_Click(object sender, RoutedEventArgs e)
{

    // get the id you want to delete from grid, other control or somewhere else
    DataGridViewRow row = this.dataGridView1.SelectedRows[0];
    var branchId = row.Cells["Id"].Value
    var branchToRemove = muTime.Branches.Find(branchId); // or whatever key is

    if (branchToRemove == null)
    {
        MessageBox.Show("No Records to delete");
        return;
    }

    muTime.Branches.Remove(branchToRemove);
    muTime.SaveChanges();
    MessageBox.Show("Deleted " + branchToRemove.ToString());  // or some property that identifies?
    branchViewSource.View.Refresh();
}

删除当前对象实体框架6

1 个答案: