从数据表中删除数据行

Question

假设我有一个数据表 dt（它包含广告商），我想从 dt 中删除广告商 ID 等于一个值的行，我该怎么做？

DataTable dt = new DataTable();
//populate the table
dt = DynamicCache.GetAdvertisers();

//I can select a datarow like this:
DataRow[] advRow = dt.Select("advertiserID = " + AdvID);

//how do you remove it, this get's me an error
dt.Rows.Remove(advRow)

那么你如何正确地做到这一点？

谢谢。

Answer 1

advRow 是一个数组。您必须确定要删除数组中的哪一行。

dt.Rows.Remove(advRow[0]);

当然，这只是将它从数据表中删除，不一定是它背后的数据源（sql、xml、...）。这将需要更多...

最好在选择后检查数组或迭代数组...

var datatable = new DataTable();
            DataRow[] advRow = datatable.Select("id=1");
            datatable.Rows.Remove(advRow[0]);
            //of course if there is nothing in your array this will get you an error..

            foreach (DataRow dr in advRow)
            {
                // this is not a good way either, removing an
                //item while iterating through the collection 
                //can cause problems.
            }

            //the best way is:
            for (int i = advRow.Length - 1; i >= 0; i--)
            {
                datatable.Rows.Remove(advRow[i]);
            }
            //then with a dataset you need to accept changes
            //(depending on your update strategy..)
            datatable.AcceptChanges();