Template Controls In Gridview
Let me summarize the problemIn XAML, the, or are the repeater controls. To define how each item is displayed in the UI, the developer defines a which he assigns to the ItemsControl’s property. The is like this: The ItemTemplate So far, so easy. This is a common scenario and necessary for any repeater control in XAML.
Rendering the ItemsControl, the is repeated (see below) for every item in the ItemsSource (which has been assigned to some enumerable value like, or even an Array).Note: It is possible to vary what is used per-item using the but for the sake of this example (and simplicity) I’m just talking about the vanilla scenario. The User Interface So far so good. Your data is displaying.
So, what’s the problem? See the name of the? It’s TextBox1 over and over and over. To make this work, the scope of a template is unique to the page.
This means referencing a inside a by name is impossible. To do so, we must spelunk into the ’s. How do you access controls inside a Template?There is more than one approach. One approach, and my least favorite, is using the on the control itself. In this approach you store the resulting (sender) in some dictionary. The up-side is that this event is handled on the page. The downside is how unmanageable it becomes if there are many objects or many different objects.
Spelunking with the Visual TreeThe preferred approach, to me, is navigating through the visual tree of the individual item. With this you are effectively changing your scope into the individual item. From there you interact with it like you expect. I realize it’s not as simple as Loaded, but ‘tis far more repeatable, understandable and maintainable, and cleaner. Here’s how you do it:In the code above, I loop through and find “TextBox2” in every item in the repeater.
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How To Get Edit Template Controls In Gridview
Just as easily you could look at just one item or just the – whatever best suited your use case. In either case, the trick is leveraging AllChildren a custom method I wrote to retrieve all the children in a given scope. Here’s the code for that method: Using VisualTreeHelperIn the code above, I iterate through the values in the method. This method, in concert with , let’s me easily move around the tree.This is a powerful method.
You can see that the heavy lifting is accomplished with the. This helper lets you interact with the Visual Tree.
The Visual Tree should not be with the Logical Tree. The Logical Tree is, basically, the XAML the developer types into the application. The Visual Tree represents those same controls and all the nested controls necessary to render the correct UI.For example, the Logic Tree is but the Visual Tree includes the border, the background, the TextBlock and anything else necessary to draw the button. As a result, searching for a control in the Visual Tree is almost always a guarantee that you will find it, if it exists.
Find Edit Template Control In Gridview
ConclusionInteracting with XAML controls is complex //until// you. Only an idiot would say there is no learning curve. But only an idiot would say it is insurmountable for an average developer to master the XAML engine in a very short time. What’s beautiful about XAML is how logical and straight-forward it is. What’s beautiful about XAML is how powerful it is. And, what’s beautiful about XAML is how reusable those skills are across MS platforms.Best of luck!