尝试添加行时,此行已经属于另一个表错误？

Question

我有一个DataTable,它有一些行,我使用select来过滤行以获取DataRows的集合,然后我使用foreach循环并将其添加到另一个DataTable,但它给了我错误"This Row已经属于到另一张桌子".这是代码:

DataTable dt = (DataTable)Session["dtAllOrders"];
DataTable dtSpecificOrders = new DataTable();

DataRow[] orderRows = dt.Select("CustomerID = 2");

foreach (DataRow dr in orderRows)
{
    dtSpecificOrders.Rows.Add(dr); //Error thrown here.
}

Answer 1

您需要Row使用第一个值创建一个新的dr.A DataRow只能属于一个DataTable.

您还可以使用Add带有一组值的数据:

myTable.Rows.Add(dr.ItemArray)

或者甚至更好:

// This works because the row was added to the original table.
myTable.ImportRow(dr);

// The following won't work. No data will be added or exception thrown.
var drFail = dt.NewRow()
drFail["CustomerID"] = "[Your data here]";
// dt.Rows.Add(row); // Uncomment for import to succeed.
myTable.ImportRow(drFail);

Answer 2

试试这个:

DataTable dt = (DataTable)Session["dtAllOrders"];
DataTable dtSpecificOrders = dt.Clone();

DataRow[] orderRows = dt.Select("CustomerID = 2");

foreach (DataRow dr in orderRows)
{
    dtSpecificOrders.ImportRow(dr);
}

Answer 3

yourTable.ImportRow(dataRow);

这是因为你要复制的行不一样TableName:

例如,尝试:

Table1.TableName = "Table1";
Table2.TableName = "Table2";