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dotnet windows forms
group:Combobox looses Value when assigning to a typed dataset
dotnet windows forms:
This one is rather strange: I have a form that displays data in a number of controls. On OK button click event I retrieve the corresponding record from my typed DataSet: MyTypedSet.FirstTableRow row = (MyTypedSet.FirstTableRow) MyTypedSet.FirstTable.Select(filter)[0]; No problems here. But then when I try to assign values to this row, my checked CheckBox becomes unchecked, my Comboboxes with DropDownStyle set to DropDown are reset (SelectedIndex = -1); but Textboxes and Comboboxes with DDStyle = DropDownList keep their values. row.AnyColumn = myTextBox.Text;
What code are you using to DataBind your controls? Could you post some sample
code? ~~Bonnie [quoted text, click to view] "Sergey Poberezovskiy" wrote:
> Hi, > > This one is rather strange: > I have a form that displays data in a number of controls. > On OK button click event I retrieve the corresponding > record from my typed DataSet: > MyTypedSet.FirstTableRow row = (MyTypedSet.FirstTableRow) > MyTypedSet.FirstTable.Select(filter)[0]; > > No problems here. But then when I try to assign values to > this row, my checked CheckBox becomes unchecked, my > Comboboxes with DropDownStyle set to DropDown are reset > (SelectedIndex = -1); but Textboxes and Comboboxes with > DDStyle = DropDownList keep their values. > row.AnyColumn = myTextBox.Text; > > Help!!!
I do not bind them - if I understand the term correctly -
I simply populate them like cbo.DataSource = new string[]{"one", "two", "three"}; and them set their values from the typed dataset: MyTypedSet.FirstTableRow row = (MyTypedSet.FirstTableRow) MyTypedSet.FirstTable.Select(filter)[0]; cbo.Text = row.MyCboField; chk.Checked = row.MyChkField; [quoted text, click to view] >-----Original Message-----
>What code are you using to DataBind your controls? Could you post some sample >code? > >~~Bonnie > >"Sergey Poberezovskiy" wrote: > >> Hi, >> >> This one is rather strange: >> I have a form that displays data in a number of controls. >> On OK button click event I retrieve the corresponding >> record from my typed DataSet: >> MyTypedSet.FirstTableRow row = (MyTypedSet.FirstTableRow) >> MyTypedSet.FirstTable.Select(filter)[0]; >> >> No problems here. But then when I try to assign values to >> this row, my checked CheckBox becomes unchecked, my >> Comboboxes with DropDownStyle set to DropDown are reset >> (SelectedIndex = -1); but Textboxes and Comboboxes with >> DDStyle = DropDownList keep their values. >> row.AnyColumn = myTextBox.Text; >> >> Help!!! >> >.
Hmmmm ... OK, let's take another tack ... how and to what values are you
setting the columns in the row? ~~Bonnie [quoted text, click to view] "Sergey Poberezovskiy" wrote:
> I do not bind them - if I understand the term correctly - > I simply populate them like > cbo.DataSource = new string[]{"one", "two", "three"}; > > and them set their values from the typed dataset: > > MyTypedSet.FirstTableRow row = (MyTypedSet.FirstTableRow) > MyTypedSet.FirstTable.Select(filter)[0]; > cbo.Text = row.MyCboField; > chk.Checked = row.MyChkField; > > > >-----Original Message----- > >What code are you using to DataBind your controls? Could > you post some sample > >code? > > > >~~Bonnie > > > >"Sergey Poberezovskiy" wrote: > > > >> Hi, > >> > >> This one is rather strange: > >> I have a form that displays data in a number of > controls. > >> On OK button click event I retrieve the corresponding > >> record from my typed DataSet: > >> MyTypedSet.FirstTableRow row = > (MyTypedSet.FirstTableRow) > >> MyTypedSet.FirstTable.Select(filter)[0]; > >> > >> No problems here. But then when I try to assign values > to > >> this row, my checked CheckBox becomes unchecked, my > >> Comboboxes with DropDownStyle set to DropDown are > reset > >> (SelectedIndex = -1); but Textboxes and Comboboxes > with > >> DDStyle = DropDownList keep their values. > >> row.AnyColumn = myTextBox.Text; > >> > >> Help!!! > >> > >. > >
Bonnie,
As I needed to move forward, I had to declare (string or bool) variables for each such control and set them to the controls' values before setting any of the row's columns... and then reset the controls' values back to those variables once I populated the row's columns. Not the quickest and cleanest way though... string cbo1Value = cbo1.Text; bool chk1Value = chk1.Checked; .... row.Field1 = cboValue1; // as soon as this line is executed the values in DropDown combos and checks are reset to defaults ?!?! row.Field2 = chkValue2; .... cbo1.Text = cbo1Value; chk1.Checked = chk1Value; The typed dataset uses the generated code - I use VS2003 Enterprise Architect - not sure what could have gone wrong?... [quoted text, click to view] >-----Original Message-----
>Hmmmm ... OK, let's take another tack ... how and to what values are you >setting the columns in the row? > >~~Bonnie > > > >"Sergey Poberezovskiy" wrote: > >> I do not bind them - if I understand the term correctly - >> I simply populate them like >> cbo.DataSource = new string[]{"one", "two", "three"}; >> >> and them set their values from the typed dataset: >> >> MyTypedSet.FirstTableRow row = (MyTypedSet.FirstTableRow) >> MyTypedSet.FirstTable.Select(filter)[0]; >> cbo.Text = row.MyCboField; >> chk.Checked = row.MyChkField; >> >> >> >-----Original Message----- >> >What code are you using to DataBind your controls? Could >> you post some sample >> >code? >> > >> >~~Bonnie >> > >> >"Sergey Poberezovskiy" wrote: >> > >> >> Hi, >> >> >> >> This one is rather strange: >> >> I have a form that displays data in a number of >> controls. >> >> On OK button click event I retrieve the corresponding >> >> record from my typed DataSet: >> >> MyTypedSet.FirstTableRow row = >> (MyTypedSet.FirstTableRow) >> >> MyTypedSet.FirstTable.Select(filter)[0]; >> >> >> >> No problems here. But then when I try to assign values >> to >> >> this row, my checked CheckBox becomes unchecked, my >> >> Comboboxes with DropDownStyle set to DropDown are >> reset >> >> (SelectedIndex = -1); but Textboxes and Comboboxes >> with >> >> DDStyle = DropDownList keep their values. >> >> row.AnyColumn = myTextBox.Text; >> >> >> >> Help!!! >> >> >> >. >> > >> >.
Sergey,
Well, since you've found a workaround for your problem, I guess it doesn't matter so much to figure out what was happening. However, I think if you had used DataBinding, it probably would have gone a lot smoother. I guess I don't understand why you *didn't* data bind, since you are using a DataSet. But, anyway, that's just my 2 cents. ~~Bonnie [quoted text, click to view] "Sergey Poberezovskiy" wrote:
> Bonnie, > > As I needed to move forward, I had to declare (string or > bool) variables for each such control and set them to the > controls' values before setting any of the row's > columns... and then reset the controls' values back to > those variables once I populated the row's columns. Not > the quickest and cleanest way though... > > string cbo1Value = cbo1.Text; > bool chk1Value = chk1.Checked; > .... > row.Field1 = cboValue1; // as soon as this line is > executed the values in DropDown combos and checks are > reset to defaults ?!?! > row.Field2 = chkValue2; > .... > cbo1.Text = cbo1Value; > chk1.Checked = chk1Value; > > The typed dataset uses the generated code - I use VS2003 > Enterprise Architect - not sure what could have gone > wrong?...
Simple:
I have a ComboBox (DropDownList style) that determines what record is shown. Once it changes I populate the other form controls with the values from the corresponding record(s) of the DataSet. And after all the changes the user has an option to either Apply the changes or discard them. And I have a strong feeling against Data Binding since early VB versions binding meant that you do not have full control of what is happening with your data. I still believe that this is the case with .Net and therefore try to avoid that as much as possible. But the question still remains unanswered... Thanks anyhow for all your time answering this. [quoted text, click to view] >-----Original Message-----
>Sergey, > >Well, since you've found a workaround for your problem, I guess it doesn't >matter so much to figure out what was happening. However, I think if you had >used DataBinding, it probably would have gone a lot smoother. > >I guess I don't understand why you *didn't* data bind, since you are using a >DataSet. But, anyway, that's just my 2 cents. > >~~Bonnie > >"Sergey Poberezovskiy" wrote: > >> Bonnie, >> >> As I needed to move forward, I had to declare (string or >> bool) variables for each such control and set them to the >> controls' values before setting any of the row's >> columns... and then reset the controls' values back to >> those variables once I populated the row's columns. Not >> the quickest and cleanest way though... >> >> string cbo1Value = cbo1.Text; >> bool chk1Value = chk1.Checked; >> .... >> row.Field1 = cboValue1; // as soon as this line is >> executed the values in DropDown combos and checks are >> reset to defaults ?!?! >> row.Field2 = chkValue2; >> .... >> cbo1.Text = cbo1Value; >> chk1.Checked = chk1Value; >> >> The typed dataset uses the generated code - I use VS2003 >> Enterprise Architect - not sure what could have gone >> wrong?... > >.
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