所以我有这个datagridview链接到绑定到底层数据表的Binding源。问题是我需要手动向datagridview添加行。
绑定时无法完成，因此我必须使用数据绑定。
如果我将行添加到基础数据表中，则在保存数据表时，行会重复，可能是因为绑定源以某种方式获得了副本并将其插入。
将它添加到绑定源是我一直在尝试做的事情，但它不是很有效。
让我准确解释一下我的设置：
我有一个包含两个表的数据库： CashReceiptTable和CashReceiptItemsTable
CashReceiptItemsTable包含FK到CashReceiptTable。
表单允许用户添加和修改两个表。
当用户输入新的cashreceipt时，现金收据的id为-1，cashReceiptitemstable中的FK为-1。保存数据库时，cashReceipt的id已更新，我必须手动更新cashreceiptitem的FK。
以下是问题：
当我尝试在cashreceiteitems绑定源中的多行中更新CashReceiptID（FK）时，第一行被更新，并且消失（因为它已被过滤），其他行被删除，我不能再访问它们。
我不知道为什么会这样，我还没有更新过滤器，所以他们应该仍然在那里，但尝试访问它们会抛出RowNotInTableException。
我已经管理了一个解决方法，将绑定源中的行复制到内存数组中，删除绑定源中的第一行（所有其他行都消失），更新行的FK并重新插入绑定源并保存表。
这没关系，但为什么行会消失？
我还有一个小问题。当CashReceiptsTable为空并且我向其添加新行时，如果我向CashReceiptsItemTable添加多行，则会导致问题。手动将项目添加到绑定源时，添加新行将弹出到上一行并将其推送到数据表。这隐藏了我的FK更新例程，它丢失了，它也将它从DataGridView中删除。
当我将第一行添加到CashReceiptsTable时，仅 才会这样做。为什么会这样做，我该如何解决？我发布的代码在此处自动填充：
private void autopopulate(decimal totalPayment) {
//remove old rows
for (int i = 0; i < tblCashReceiptsApplyToBindingSource.List.Count; i++) {
DataRowView viewRow = tblCashReceiptsApplyToBindingSource.List[i] as DataRowView;
RentalEaseDataSet.tblCashReceiptsApplyToRow row = viewRow.Row as RentalEaseDataSet.tblCashReceiptsApplyToRow;
if (row.CashReceiptsID == this.ReceiptID) {
tblCashReceiptsApplyToBindingSource.List.Remove(viewRow);
i--;
}
}
decimal payment = totalPayment;
//look for an exact amount
foreach (DataGridViewRow dueRow in dataViewDueRO.Rows) {
decimal due = -1 * (Decimal)dueRow.Cells[Due.Index].Value;
if (due == payment) {
String charge = (String)dueRow.Cells[Description.Index].Value;
int chargeID = ManageCheckbooks.findTransactionID(charge);
tblCashReceiptsApplyToBindingSource.AddNew();
RentalEaseDataSet.tblCashReceiptsApplyToRow row = ((DataRowView)tblCashReceiptsApplyToBindingSource.Current).Row as RentalEaseDataSet.tblCashReceiptsApplyToRow;
row.CashReceiptsID = this.ReceiptID;
row.ApplyTo = chargeID;
row.Paid = payment; //convert to positive
payment = 0;
break;
}
}
//if the exact amount was found, payment will = 0, and this will do nothing, otherwise,
//divy out everything left over (which will be everything)
foreach (DataGridViewRow dueRow in dataViewDueRO.Rows) {
String charge = (String)dueRow.Cells[Description.Index].Value;
decimal due = (Decimal)dueRow.Cells[Due.Index].Value;
if (due > 0 || payment <= 0) {
continue;
}
int chargeID = ManageCheckbooks.findTransactionID(charge);
payment += due; //due is negative, so this will subtract how much the user owes
tblCashReceiptsApplyToBindingSource.AddNew();
RentalEaseDataSet.tblCashReceiptsApplyToRow row = ((DataRowView)tblCashReceiptsApplyToBindingSource.Current).Row as RentalEaseDataSet.tblCashReceiptsApplyToRow;
row.CashReceiptsID = this.ReceiptID;
row.ApplyTo = chargeID;
if (payment >= 0) {
//payment is enough to cover this
row.Paid = due * -1; //convert to positive
} else {
//doesn't have enough money to conver this, can only cover partial, or none
row.Paid = (due - payment) * -1; //math:
//money remaining $50, current charge = $60
//payment = 50 + -60 = -10
//row["Paid"] = (-60 - -10) * -1
//row["Paid"] = (-60 + 10) * -1
//row["Paid"] = -50 * -1
//row["Paid"] = 50
}
if (payment <= 0) {
break; //don't conintue, no more money to distribute
}
}
isVirginRow = true;
}
这是将其保存到数据库的功能：
protected override void saveToDatabase() {
tblCashReceiptsBindingSource.EndEdit();
isVirginRow = false;
RentalEaseDataSet.tblCashReceiptsRow[] rows = rentalEaseDataSet.tblCashReceipts.Select("ID < 0") as RentalEaseDataSet.tblCashReceiptsRow[];
int newID = -1;
if (rows.Count() > 0) {
tblCashReceiptsTableAdapter.Update(rows[0]);
newID = rows[0].ID;
}
tblCashReceiptsTableAdapter.Update(rentalEaseDataSet.tblCashReceipts);
//update table
/*foreach (RentalEaseDataSet.tblCashReceiptsApplyToRow row in rentalEaseDataSet.tblCashReceiptsApplyTo.Select("CashReceiptsID = -1")) {
row.CashReceiptsID = newID;
}*/
//update binding source
DataRowView[] applicationsOld = new DataRowView[tblCashReceiptsApplyToBindingSource.List.Count];
RentalEaseDataSet.tblCashReceiptsApplyToRow[] applicationsNew = new RentalEaseDataSet.tblCashReceiptsApplyToRow[tblCashReceiptsApplyToBindingSource.List.Count];
tblCashReceiptsApplyToBindingSource.List.CopyTo(applicationsOld, 0);
for (int i = 0; i < applicationsOld.Count(); i++) {
RentalEaseDataSet.tblCashReceiptsApplyToRow row = applicationsOld[i].Row as RentalEaseDataSet.tblCashReceiptsApplyToRow;
if (row.CashReceiptsID < 0) {
applicationsNew[i] = rentalEaseDataSet.tblCashReceiptsApplyTo.NewRow() as RentalEaseDataSet.tblCashReceiptsApplyToRow;
applicationsNew[i]["ID"] = row.ID;
applicationsNew[i]["CashReceiptsID"] = this.ReceiptID;
applicationsNew[i][2] = row[2];
applicationsNew[i][3] = row[3];
applicationsNew[i][4] = row[4];
//row.Delete();
}
}
for (int i = 0; i < applicationsOld.Count(); i++) {
try {
if ((int)applicationsOld[i].Row["ID"] < 0) {
applicationsOld[i].Row.Delete();
}
} catch (RowNotInTableException) {
break;
}
}
this.tblCashReceiptsApplyToBindingSource.Filter = "CashReceiptsID = " + this.ReceiptID;
foreach (DataRow newRow in applicationsNew) {
if (newRow == null) {
break;
}
tblCashReceiptsApplyToBindingSource.AddNew();
((DataRowView)tblCashReceiptsApplyToBindingSource.Current).Row[0] = newRow[0];
((DataRowView)tblCashReceiptsApplyToBindingSource.Current).Row[1] = newRow[1];
((DataRowView)tblCashReceiptsApplyToBindingSource.Current).Row[2] = newRow[2];
((DataRowView)tblCashReceiptsApplyToBindingSource.Current).Row[3] = newRow[3];
((DataRowView)tblCashReceiptsApplyToBindingSource.Current).Row[4] = newRow[4];
}
tblCashReceiptsApplyToBindingSource.EndEdit();
checkForBadRows();
tblCashReceiptsApplyToTableAdapter.Update(rentalEaseDataSet.tblCashReceiptsApplyTo);
tblCashReceiptsApplyToTableAdapter.Fill(rentalEaseDataSet.tblCashReceiptsApplyTo);
}
答案 0 :(得分：1)
您可能想尝试向DataGridView添加行。由于您绑定了它，DataGridView将成为您的“访问点”。
我有几个绑定到DataGridView的应用程序，在大多数情况下，当我添加一行时，我通过DataGridView这样做。它已经具有属性/方法/事件，可以让您相对轻松地添加。
如果您需要更多信息，我可以更新。