How to show a different text for bool

Hi,

is there a simple way to display a different text on a bool-bound text.

Assume I have an app with a label showing some bool value from an SQL-Table.
This shows True or False - what I want is to show (for an example) Yes / No, or 1 / 0 on "Out off office" / "In the office".

Another "problem" is that I sometimes want to bind reverse.
So for an example I want to hide a button if some expression is true.
The other way is simple - I bind the Visible attribute to the bool - but what if this is different.
Or what if I want to enable when a textfield has a certain value?

In ASP.NET I would write something like Attr="<%# Eval("Field")=="Simple" ? "Is Simple" : "Comlicated" %>

I messed around a lot with custom format and could not find a way (other than codeing).

Cheers

Manfred

[818 byte] By [ManniAT] at [2008-2-10]

«« How to show a different text for bool (reverse bind)
»» XML Tools in VS 2005

# 1

You'll need to write some code. You can either handle the Format/Parse events or set up a lookup table. I prefer setting up a lookup table (example below). Note that post Beta 2 you'll be able to setup a typed lookup using a KeyValuePair rather than the un-typed version below.

Joe

List<DictionaryEntry> xup = new List<DictionaryEntry>();

xup.Add(new DictionaryEntry(false, "No"));
xup.Add(new DictionaryEntry(true, "Yes"));

this.comboBox1.DataSource = xup;
this.comboBox1.DisplayMember = "Value";
this.comboBox1.ValueMember = "Key";

this.comboBox1.DataBindings.Add("SelectedValue", this, "BoolProperty", true, DataSourceUpdateMode.OnPropertyChanged);

JoeStegman at 2007-9-8 >

top of Msdn Tech,Windows Forms,Windows Forms Data Controls and Databinding...

# 2

Hi Joe,

thank you for the reply, but I'm not very shure if this helps in my situation.
First I have a label bound to a Field in a binding source.
The binding code looks like this

lblIsRegistred.DataBindings.Add(new Binding("Text", SettingsBindingSource, "IsRegistred", true, DataSourceUpdateMode.Never));

Since it is a label no changes are needed. But it writes True / False instead of Yes / No.

The other thing is a button I want to show when a boolean is FALSE.
At the moment it is doing exact the oposite

btnStartSync.DataBindings.Add(new Binding("Visible", SettingsBindingSource, "IsRegistred", true, DataSourceUpdateMode.Never));

I can't see how that would work with a lookup table!!

Cheers

Manfred

ManniAT at 2007-9-8 >

# 3

Yes - in the first scenario you'll need to hook the Binding.Format event:

b = new Binding("Text", SettingsBindingSource, "IsRegistered", true, DataSourceUpdateMode.Never);

b.Format += delegate(object s, ConvertEventArgs c)
{
c.Value = (((bool)c.Value) ? "Yes" : "No");
};

lblIsRegistred.DataBindings.Add(b);

For the second, you need to do a similar thing:

Binding b = new Binding("Visible", SettingsBindingSource, "IsRegistered", true, DataSourceUpdateMode.Never);

b.Format += delegate(object send, ConvertEventArgs args)
{
args.Value = (((bool)args.Value) ? false : true);
};
btnStartSync.DataBindings.Add(b);

Joe

JoeStegman at 2007-9-8 >

# 4

Hi Joe,

so the answer to my Thread is not YES - it is NO Smile
NO: there is no simple way.....

I'm used to do such "declarative binding" from ASP.NET and had a hope that this is also possible in Windows.Forms.

But - as you showed - it is possible without doing "extreme things".
I'v seen a similar example on MSDN - but they did a more complex thing so I was hopeing....

Thanks for your kindfull help

Manfred

ManniAT at 2007-9-8 >

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