请帮我找到此错误的来源：
Error happened Display: System.IndexOutOfRangeException: Index 0 does not have a value.
at System.Windows.Forms.CurrencyManager.get_Item(Int32 index)
at
System.Windows.Forms.DataGridview.DataGridViewDataConnection.GetError(Int32 rowIndex)
此错误仅在我关闭表单时出现并且不会消失。每次点击OK，索引0都会继续递增。
加载表单时不会遇到任何问题。
这是我的整个代码：
public partial class frmSalesOrders : Form
{
public frmSalesOrders()
{
InitializeComponent();
}
private void frmSalesOrders_Load(object sender, EventArgs e)
{
this.Enabled = false;
this.usersTableAdapter.Fill(this.dsSalesOrders.users);
this.companiesTableAdapter.Fill(this.dsSalesOrders.companies);
this.salesordersTableAdapter.Fill(this.dsSalesOrders.salesorders);
this.Enabled = true;
}
private void btnSOFilter_Click(object sender, EventArgs e)
{
try
{
string key = tbSOFilterKey.Text;
int custid = Convert.ToInt32(cbSOFilterByCustomer.SelectedValue);
string startdate = dtpSOFilterStartDate.Value.ToShortDateString();
string enddate = dtpSOFilterEndDate.Value.ToShortDateString();
salesordersBindingSource.Filter = string.Format("comp = '{0}' AND (sonumber LIKE '%{1}%' OR ponumber LIKE '%{1}%') AND podate > '{2}' AND podate <'{3}'", custid, key, startdate, enddate);
}
catch(Exception ex)
{
DialogResult res = MessageBox.Show(ex.Message, "Exception Error on Filter of Sales Orders", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
if(res == DialogResult.Retry)
{
string key = tbSOFilterKey.Text;
int custid = Convert.ToInt32(cbSOFilterByCustomer.SelectedValue);
string startdate = dtpSOFilterStartDate.Value.ToShortDateString();
string enddate = dtpSOFilterEndDate.Value.ToShortDateString();
salesordersBindingSource.Filter = string.Format("comp = '{0}' AND (sonumber LIKE '%{1}%' OR ponumber LIKE '%{1}%') AND podate > '{2}' AND podate <'{3}'", custid, key, startdate, enddate);
}
else
{
tbSOFilterKey.Clear();
}
}
}
private void btnSOClearFilter_Click(object sender, EventArgs e)
{
try
{
tbSOFilterKey.Clear();
cbSOFilterByCustomer.SelectedValue = 0;
dtpSOFilterStartDate.Value = Convert.ToDateTime("01/01/1970");
dtpSOFilterEndDate.Value = DateTime.Now;
salesordersBindingSource.RemoveFilter();
}
catch(Exception ex)
{
DialogResult res = MessageBox.Show(ex.Message, "Exception Error on Clearing Filter of Sales Orders", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
if (res == DialogResult.Retry)
{
tbSOFilterKey.Clear();
cbSOFilterByCustomer.SelectedValue = 0;
dtpSOFilterStartDate.Value = Convert.ToDateTime("01/01/1970");
dtpSOFilterEndDate.Value = DateTime.Now;
salesordersBindingSource.RemoveFilter();
}
else
{
return;
}
}
}
private void btnCancelChanges_Click(object sender, EventArgs e)
{
try
{
salesordersBindingSource.CancelEdit();
formatOrderAmt();
}
catch(Exception ex)
{
DialogResult res = MessageBox.Show(ex.Message, "Exception Error on Cancellation of Changes to Sales Orders", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
if(res == DialogResult.Retry)
{
salesordersBindingSource.CancelEdit();
formatOrderAmt();
}
else
{
return;
}
}
}
private void btnSaveChanges_Click(object sender, EventArgs e)
{
try
{
cbSOLastModBy.SelectedValue = UserDetails.userid;
tbSOLastModOn.Text = DateTime.Now.ToString();
int rowIndex = dGridSalesOrdersList.CurrentCell.RowIndex;
this.Cursor = Cursors.WaitCursor;
this.Enabled = false;
this.Validate();
this.salesordersBindingSource.EndEdit();
this.salesordersTableAdapter.Update(dsSalesOrders.salesorders);
this.salesordersTableAdapter.Fill(dsSalesOrders.salesorders);
this.dGridSalesOrdersList.ClearSelection();
this.dGridSalesOrdersList.Rows[rowIndex].Selected = true;
this.Enabled = true;
this.Cursor = Cursors.Default;
}
catch(Exception ex)
{
DialogResult res = MessageBox.Show(ex.Message, "Exception Error on Saving of Changes to Sales Orders", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
if (res == DialogResult.Retry)
{
cbSOLastModBy.SelectedValue = UserDetails.userid;
tbSOLastModOn.Text = DateTime.Now.ToString();
int rowIndex = dGridSalesOrdersList.CurrentCell.RowIndex;
this.Cursor = Cursors.WaitCursor;
this.Enabled = false;
this.Validate();
this.salesordersBindingSource.EndEdit();
this.salesordersTableAdapter.Update(dsSalesOrders.salesorders);
this.salesordersTableAdapter.Fill(dsSalesOrders.salesorders);
this.dGridSalesOrdersList.ClearSelection();
this.dGridSalesOrdersList.Rows[rowIndex].Selected = true;
this.Enabled = true;
this.Cursor = Cursors.Default;
}
else
{
this.salesordersBindingSource.CancelEdit();
}
}
}
private void btnSONew_Click(object sender, EventArgs e)
{
try
{
this.dGridSalesOrdersList.ClearSelection();
DataRowView drv = (DataRowView) salesordersBindingSource.AddNew();
drv["sonumber"] = "Auto";
drv["status"] = false;
drv["cancelled"] = false;
drv["podate"] = DateTime.Now;
drv["orderamt"] = 0;
drv["createdby"] = UserDetails.userid;
drv["createdon"] = DateTime.Now;
drv["lastmodby"] = UserDetails.userid;
drv["lastmodon"] = DateTime.Now;
this.dGridSalesOrdersList.CurrentCell.Selected = true;
}
catch(Exception ex)
{
DialogResult res = MessageBox.Show(ex.Message, "Exception Error on Adding New Sales Orders", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
if (res == DialogResult.Retry)
{
this.dGridSalesOrdersList.ClearSelection();
DataRowView drv = (DataRowView)salesordersBindingSource.AddNew();
drv["sonumber"] = "Auto";
drv["status"] = false;
drv["cancelled"] = false;
drv["podate"] = DateTime.Now;
drv["orderamt"] = 0;
drv["createdby"] = UserDetails.userid;
drv["createdon"] = DateTime.Now;
drv["lastmodby"] = UserDetails.userid;
drv["lastmodon"] = DateTime.Now;
this.dGridSalesOrdersList.CurrentCell.Selected = true;
}
else
{
this.salesordersBindingSource.CancelEdit();
}
}
}
private void frmSalesOrders_FormClosing(object sender, FormClosingEventArgs e)
{
try
{
this.salesordersBindingSource.CancelEdit();
}
catch (Exception ex)
{
DialogResult res = MessageBox.Show(ex.Message, "Exception Error on Closing Form", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
if (res == DialogResult.Retry)
{
this.salesordersBindingSource.CancelEdit();
}
else
{
this.salesordersBindingSource.CancelEdit();
}
}
}
private void btnSOViewMoreDetails_Click(object sender, EventArgs e)
{
try
{
this.Cursor = Cursors.WaitCursor;
this.Enabled = false;
soSelected.soid = Convert.ToInt32(tbSOSequence.Text);
frmSODetails soDetails = new frmSODetails();
soDetails.ShowDialog();
this.Cursor = Cursors.WaitCursor;
this.salesordersTableAdapter.Fill(this.dsSalesOrders.salesorders);
this.Enabled = true;
this.Cursor = Cursors.Default;
}
catch (Exception ex)
{
DialogResult res = MessageBox.Show(ex.Message, "Exception Error on Viewing Sales Order Details", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
if (res == DialogResult.Retry)
{
this.Cursor = Cursors.WaitCursor;
this.Enabled = false;
soSelected.soid = Convert.ToInt32(tbSOSequence.Text);
frmSODetails soDetails = new frmSODetails();
soDetails.ShowDialog();
this.Cursor = Cursors.WaitCursor;
this.salesordersTableAdapter.Fill(this.dsSalesOrders.salesorders);
this.Enabled = true;
this.Cursor = Cursors.Default;
}
else
{
frmSODetails soDetails = new frmSODetails();
soDetails.Close();
}
}
}
private void formatOrderAmt()
{
if(tbSOPOAmount.TextLength > 0)
{
decimal amount = Convert.ToDecimal(tbSOPOAmount.Text);
tbSOPOAmount.Text = string.Format("{0:#,##0.00}", double.Parse(amount.ToString()));
}
else
{
tbSOPOAmount.Text = string.Format("{0:#,##0.00}", double.Parse("0.00"));
}
}
private void dGridSalesOrdersList_DataError(object sender, DataGridViewDataErrorEventArgs anError)
{
MessageBox.Show("Error happened " + anError.Context.ToString() + " : "+ anError.Exception.ToString());
if (anError.Context == DataGridViewDataErrorContexts.Commit)
{
MessageBox.Show("Commit error");
}
if (anError.Context == DataGridViewDataErrorContexts.CurrentCellChange)
{
MessageBox.Show("Cell change");
}
if (anError.Context == DataGridViewDataErrorContexts.Parsing)
{
MessageBox.Show("parsing error");
}
if (anError.Context == DataGridViewDataErrorContexts.LeaveControl)
{
MessageBox.Show("leave control error");
}
if ((anError.Exception) is ConstraintException)
{
DataGridView view = (DataGridView)sender;
view.Rows[anError.RowIndex].ErrorText = "an error";
view.Rows[anError.RowIndex].Cells[anError.ColumnIndex].ErrorText = "an error";
anError.ThrowException = false;
}
}
private void dGridSalesOrdersList_SelectionChanged(object sender, EventArgs e)
{
//formatOrderAmt();
}
}
答案 0 :(得分：0)
免责声明：我不确定这是否真的解决了这个问题或只是一个快速修复。
我尝试从MSDN Forum实现一个建议，即在Form_Closed事件中处理DataGridView和BindingSource，但错误确实消失了。
代码：
private void frmSalesOrders_FormClosed(object sender, FormClosedEventArgs e)
{
usersBindingSourceSOCreatedBy.Dispose();
usersBindingSourceSOLastModBy.Dispose();
companiesBindingSource.Dispose();
salesordersBindingSource.Dispose();
dGridSalesOrdersList.Dispose();
}