The Relative Source is a markup extension that is used in particular binding cases when we try to bind a property of a given object to another property of the object itself, when we try to bind a property of a object to another one of its relative parents, when binding a dependency property value to a piece of XAML in case of custom control development and finally in case of using a differential of a series of a bound data. Mode Self: Imagine this case, a rectangle that we want that its height is always equal to its width, a square let's say.
All of those situations are expressed as relative source modes. We can do this using the element name For that case we are not obliged to mention the name of the binding object and the Width will be always equal to the Height whenever the height is changed.
There is no shortage of information out there on how to speed up the performance of WPF applications, but too often the focus is on the weird stuff instead of the simpler issues.
I’m not going to talk about things like writing to to optimize drawing—it’s a topic covered to death elsewhere.
There will be loads of output from the debugger, but somewhere you should find a line like this, when running the above example: System. Data Error: 40 : Binding Expression path error: 'Non Existing Property' property not found on 'object' ''Grid' (Name='pnl Main')'.
Binding Expression: Path=Non Existing Property; Data Item='Grid' (Name='pnl Main'); target element is 'Text Block' (Name=''); target property is 'Text' (type 'String') It tells you that you have tried to use a property called "Non Existing Property" on an object of the type Grid, with the name pnl Main.
As stated in the article on data contexts, WPF will use the Data Context property on the Text Block here, which may be inherited down the control hierarchy, but in this example, I forgot to assign a data context.The problem is that none of the buttons seems to work. The first step is to get the UI to respond to changes in the list source (Items Source), like when we add or delete a user.What we need is a list that notifies any destinations of changes to its content, and fortunately, WPF provides a type of list that will do just that.property in WPF is extremely handy, because it is automatically inherited by all children of the element where you assign it; therefore you don’t need to set it again on each element you want to bind.However, in some cases the is not accessible: it happens for elements that are not part of the visual or logical tree.
Binding Expression: Path=Show Price; Data Item=null; target element is ‘Data Grid Text Column’ (Hash Code=32685253); target property is ‘Visibility’ (type ‘Visibility’) But none of these workarounds seems to work, we always get the same result…