Returns whether changing a value on this object requires a call to CreateInstance IDictionary to create a new value, using the specified context. Returns a collection of properties for the type of array specified by the value parameter, using the specified context. Returns a collection of properties for the type of array specified by the value parameter, using the specified context and attributes.
Returns a collection of standard values from the default context for the data type this type converter is designed for. Returns a collection of standard values for the data type this type converter is designed for when provided with a format context. Returns whether the collection of standard values returned from GetStandardValues is an exclusive list.
Returns whether the collection of standard values returned from GetStandardValues is an exclusive list of possible values, using the specified context. Returns whether this object supports a standard set of values that can be picked from a list, using the specified context. Gets the Type of the current instance. Creates a shallow copy of the current Object.
Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Please rate your experience Yes No. Any additional feedback? Namespace: System. Markup Assembly: PresentationFramework. In this article. CanConvertFrom Type. Inherited from TypeConverter. CanConvertTo Type. Returns whether this converter can convert the object to the specified type.
ConvertFrom Object. Converts the given value to the type of this converter. ConvertFromInvariantString String. The Desktop Guide documentation for. NET 6 and. NET 5 including. NET Core 3. The article assumes a basic knowledge of dependency properties, and that you've read Dependency properties overview. The Register method returns a DependencyProperty instance that holds the registered name and characteristics of a dependency property. For example, the identifier field for the Background property is always BackgroundProperty.
The dependency property identifier is used as a backing field for getting or setting property values, rather than the standard pattern of backing a property with a private field.
Not only does the property system uses the identifier, XAML processors may use it, and your code and possibly external code can access dependency properties through their identifiers. Dependency properties can only be applied to classes that are derived from DependencyObject types. For more information about dependency properties, and the terminology and conventions used to describe them, see Dependency properties overview. WPF dependency properties that aren't attached properties are exposed by a CLR wrapper that implements get and set accessors.
By using a property wrapper, consumers of dependency properties can get or set dependency property values, just as they would any other CLR property. The get and set accessors interact with the underlying property system through DependencyObject. GetValue and DependencyObject. SetValue calls, passing in the dependency property identifier as a parameter.
Consumers of dependency properties typically don't call GetValue or SetValue directly, but if you're implementing a custom dependency property you'll use those methods in the wrapper. When you implement a property on a class that derives from DependencyObject , you make it a dependency property by backing your property with a DependencyProperty identifier.
Whether it's beneficial to create a dependency property depends on your scenario. Although backing your property with a private field is adequate for some scenarios, consider implementing a dependency property if you want your property to support one or more of the following WPF capabilities:. Properties that are settable within a style. For more information, see Styles and templates.
Properties that support data binding. For more information about data binding dependency properties, see Bind the properties of two controls. Properties that are settable through dynamic resource references. For more information, see XAML resources. Properties that automatically inherit their value from a parent element in the element tree. For this, you'll need to register using RegisterAttached , even if you also create a property wrapper for CLR access.
For more information, see Property value inheritance. Properties that are animatable. For more information, see Animation overview. Notification by the WPF property system when a property value changes. Changes might be due to actions by the property system, environment, user, or styles.
Your property can specify a callback method in property metadata that will get invoked each time the property system determines that your property value changed. A related concept is property value coercion. For more information, see Dependency property callbacks and validation.
Access to dependency property metadata, which is read by WPF processes. For example, you can use property metadata to:. Specify whether a changed dependency property value should make the layout system recompose visuals for an element.
Visual Studio WPF designer support, such as editing the properties of a custom control in the Properties window. For more information, see Control authoring overview. For some scenarios, overriding the metadata of an existing dependency property is a better option than implementing a new dependency property.
Whether a metadata override is practical depends on your scenario, and how closely that scenario resembles the implementation of existing WPF dependency properties and classes.
For more information about overriding metadata on existing dependency properties, see Dependency property metadata. Follow these steps to create a dependency property. Some of the steps can be combined and implemented in a single line of code.
Register the dependency property with the property system, specifying a property name, an owner type, the property value type, and optionally, property metadata. Define a DependencyProperty identifier as a public static readonly field on the owner type.
The identifier field name is the property name with the suffix Property appended. The Label. ToolTip works - it displays the correct value. But the converter produces the error. Converters will not be part of the visual tree, thats why it couldnt find it. The user should be able to select the flags using the checkboxes.
You are better off with a multivalueconverter, so that you can send whatever binding you want. Show 4 more comments. Active Oldest Votes. Improve this answer. You are completely right - the Flag binding does not work. But I can use the x:Reference solution for both items and now it works. But I get lots of System. Need to trace down the errors but you pointed me to the right direction, thanks!
Add a comment. The FlagControl has two dependency properties Flag System. This way I don't need a converter and logic is clearly separated. Thanks for the suggestions, comments and replies! Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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