I have a working PropertyGrid which in some cases goes disabled.
now I have a new case, in which I need it to enable only one property, is there an easy way of doing it?
thanks
Instead of disabling PropertyGrid, you could mark all relevant nested properties as readonly in your data class, in order to show them disabled in the property grid.
If you want to add ReadOnly attributes at runtime have a look at: https://www.csharp-examples.net/readonly-propertygrid/
Otherwise I'd use a DataGrid or something similar.
Related
This is my first question here so bear with me.
I've encountered a bug in my software where multiple radio buttons in a given control are both capable of being selected simultanously as shown here. Note that this is a very large program.
Multiple Radio Buttons Selected in One Control
While debugging this I found the cause of this behavior is that the ReadOnly attribute on the "Checked" property for the RadioButton class is set to true. In additional, it seems as though the ReadOnly attribute for all properties on the RadioButton are set to True. I was able to confirm this was causing the unexpected behavior by changing the value of the ReadOnly attribute via reflection back to false. Interestingly, when this occured every radio button in my application experiences the same problem.
I was able to track down at what point the attributes changes. In a different form I show some objects on a property grid, when I set the SelectedObject of that property grid to the object thats when all of the attributes change. The form with the property grid and the form with the radio button are not common in anyway.
I've been unable to track down the source of this problem for some time now. If anyone has any ideas as to how this is possible it may be able to help me figure out where the issue is in my program.
Here are pictures of my debug window showing the ReadOnly attribute value on a radiobutton just before and just after I set the SelectedObject property for the property grid
Just Before
Just After
Thank you.
Edit 1:
Here is the code that sets the property grid. Line 179. While debugging there are 3 different sub property objects that need to be shown in different tabs. The first causes no issues. The second does.
Property Grid Code
Edit 2:
Solution
Thanks to all the people who commented. I was actually able to figure out the solution to the problem with help from the following thread.
Setting ReadOnly Property in PropertyGrid
Basically, there was a spot in my code where I was setting the ReadOnly status of all attributes in an object to True. It seems as though there is some kind of common "ReadOnly" attribute that is shared among all objects if they do not have a special define.
My original solution was to first check if the ReadOnlyAttribute existed before setting its value like so.
Original Solution
However this was returning True for properties defined like this
Non ReadOnly Property
But False for properties like this
ReadOnly Property
My guess again is that there is some kind of inherit attribute that was getting found.
My solution therefore was to check with the following function.
Final Solution
Putting this check in my SetReadOnly() function solved my problem.
Solution
Thanks to all the people who commented. I was actually able to figure out the solution to the problem with help from the following thread.
Setting ReadOnly Property in PropertyGrid
Basically, there was a spot in my code where I was setting the ReadOnly status of all attributes in an object to True. It seems as though there is some kind of common "ReadOnly" attribute that is shared among all objects if they do not have a special define.
My original solution was to first check if the ReadOnlyAttribute existed before setting its value like so.
Original Solution
However this was returning True for properties defined like this
Non ReadOnly Property
But False for properties like this
ReadOnly Property
My guess again is that there is some kind of inherit attribute that was getting found.
My solution therefore was to check with the following function.
Final Solution
Putting this check in my SetReadOnly() function solved my problem.
I have an existing custom control library with controls which may contain properties: HeaderStyle, ModalStyle, Collapsable, etc...
In the user interface the program is currently displaying a categorized list of these properties. I am trying to update this code to hide properties they dont normally use. I have a list of properties to hide/show based on button click but I am not sure how I can hide these fields programmatically.
I would like to retain any values entered into the fields before hiding and re-display the values if the fields are shown again.
Here is a property that current exists but would like to be hidden/shown on toggle.
/// <summary>ModalStyle property for control</summary>
[XmlAttribute]
[DefaultValue(Utility.Common.Enumerations.ModalStyle.None)]
[Category(PropertyCategories.Rendering)]
[Description("Modal dialog style")]
public ModalStyle? ModalStyle
{
get { return control.ModalStyleActive; }
set { control.ModalStyle = value; }
}
My original though was to do some variant on #if DEBUG but use my own Conditional however I was unable to find a way to change my conditionals via button/toggle.
Can anyone please help with a solution to my problem? I have 20-30 controls with 20 to 30 properties that would like to be filtered.
I have two suggestions that, while they may not give you the exact functionality desired, will keep your solution much more straight forward.
First:
Since you are the library developer you should just decide what properties you want other developers to have access to though the IDE properties window. If a property is seldom used or not very useful through the IDE then just place the [Browsable(false)] attribute on it.
Second:
If you really want all properties to be visible in the IDE properties window, but want to give individuals a way of hiding the more advanced (or less used) ones, just throw them all in an 'Advanced' category. The user can then simply collapse that category and forget about them.
Also: Take a look at Oliver's answer to this question:
[how-to-show-or-hide-properties-dynamically-in-the-propertygrid]
I'm not sure to understand what you are trying to achieve.
When you use Attributes, those are static to the class. So, in your case, when you toggle a show/hide on an object, it's on an instance of the object. Also, you cannot change an attribute value at run-time.
Maybe you should try an alternate solution like creating a global
map<pair<type of object, property name>, is shown>
and update that accordingly from your editor.
And if you want to use something like a property grid, you will have a problem since it won't check your map, but it can be fixed. You could create a new class at run-time and make it a proxy to your current instance. (check on the net how to achieve that, but it's quite simple. There are 2 possibilities: compile from a string or use the ILGenerator.
Hope this help.
I have around 30 elements/objects for which i need PropertyGrid to show their properties in it,but the problem is that every object has different properties so i created a database for it.
I don't know how to add properties in PropertyGrid from the Database.
I am going to assume that you are using Windows Forms, since you are asking about PropertyGrid. If you have objects (meaning classes) that have the properties you want to display in your PropertyGrid, you need only to set PropertyGrid.SelectedObject with the object you want to display. By default, PropertyGrid will use reflection to find all the public properties of your object, and will display them.
You can use various attributes to control how PropertyGrid displays properties. For example, you can apply the Description attribute to a class property to add help text that the property grid will display. You can use the Browsable attribute to control whether PropertyGrid will display a given property. There are other attributes in the System.ComponentModel namespace that you can use.
I am using a PropertyGrid for configuring objects. I need to be able to hide or show some properties depending on the values of other properties. How this can be achieved? I know about Browsable attribute, but it only works at a compile time.
Take a look into the ICustomTypeDescriptor Interface.
Further informations on how to use it can be found in this article:
Bending the .NET PropertyGrid to Your Will.
Check this link Changing Browsable Property Attribute dynamically.A sample method is given.
Using Reflection access the Property and set its browsable property to true or false.
I have a custom collection, lets says COL, that derives from ObjectModel.Collection.
I have my own collection editor that works fine when a property, of type COL, is Read and Write enabled.
However, if I change the property to ReadOnly, the open editor button stops showing in the property grid.
As a test, I override my custom editor with the CollectionEditor, and that worked fine.
So, my question is, what check is the property grid making, that CollectionEditor passes but my collection editor fails?
There's not much to override in UITypeEditor, so I fear there's some hard coding going on with regards to CollectionEditor.
Cheers.
ETA:
I've answered the question below.
I've found out why it wasn't appearing and it appears to be a bug in the PropertyGrid.
The button does appear if the EditStyle is set to Modal, but does not appear if it's set to DropDown.
One would have thought that the styles were just for ..., well, style?
Looking in reflector, the issue occurs because additional checks of readonly propertyies (such as checking if it's a reference type - and enabling the button) only happen if the style is set to modal. Hmmm, nice one.
I think the behavior you describe in your own answer is not a bug and is by design, and frankly it's quite logical. Look the dropdown editors around: they offer the user to make a selection and therefore the result is a new value for the property (see ColorEditor, AnchorEditor, DockEditor, CursorEditor, ...). As such the property must not be readonly. A modal editor is more to edit a value (usually a reference type) and therefore can be used even if the property is readonly. Of course, this one can also be used to select a new value (like the FileNameEditor for example).
So maybe the answer is "look at your UI design". Are you sure you should use a dropdown editor to edit the content of a reference type?