Question

在以下代码中，UPDATE正在运行，但DELETE无效。当我删除它时删除它并且GridView1不显示它但数据库仍然有它。 customers有PrimaryKey。

using (SqlConnection connection = new SqlConnection(conString))
        {
            SqlDataAdapter adapter = new SqlDataAdapter();
            adapter.SelectCommand = new SqlCommand("select * from customers", connection);
            SqlCommandBuilder builder = new SqlCommandBuilder(adapter);
            connection.Open();
            DataTable customers = new DataTable();
            adapter.Fill(customers);
            // code to modify data in DataTable here
        customers.Rows.RemoveAt(rowIndex);
            GridView1.EditIndex = -1;
            GridView1.DataSource = customers;
            GridView1.DataBind();
            adapter.Update(customers);

Answer 1

您不想从DataTable中删除该行，而是delete它。

DataRow的DataRowState必须修改为deleted，然后DataAdapter知道它必须在数据源中删除它。

以下将删除它：

customers.Rows(rowIndex).delete();//now DataRow's DataRowState is Deleted
adapter.Update(customers);        // now it's actually deleted

更多信息：MSDN How to: Delete Rows in a DataTable

顺便说一下，如果你改变主意，以下会阻止DataRow被删除：

customers.Rows(rowIndex).RejectChanges();

RowState将更改回Unchanged。这适用于DataRow或whole DataTable。

为什么SQLCommandBuilder没有删除？

1 个答案: