Evaluate TextBox.LineCount only once in UpdateAttachedProperties (#3874)

greuelpirat · web-flow · commit 4733a54434d5 · 2025-06-18T17:25:56.000Z
diff --git a/src/MaterialDesignThemes.Wpf/Behaviors/TextBoxLineCountBehavior.cs b/src/MaterialDesignThemes.Wpf/Behaviors/TextBoxLineCountBehavior.cs
@@ -18,8 +18,9 @@ private void UpdateAttachedProperties()
             associatedObject.Dispatcher
                 .BeginInvoke(() =>
                 {
-                    associatedObject.SetCurrentValue(TextFieldAssist.TextBoxLineCountProperty, associatedObject.LineCount);
-                    associatedObject.SetCurrentValue(TextFieldAssist.TextBoxIsMultiLineProperty, associatedObject.LineCount > 1);
+                    int lineCount = associatedObject.LineCount;
+                    associatedObject.SetCurrentValue(TextFieldAssist.TextBoxLineCountProperty, lineCount);
+                    associatedObject.SetCurrentValue(TextFieldAssist.TextBoxIsMultiLineProperty, lineCount > 1);
                 },
                 DispatcherPriority.Background);
         }

Original file line number	Diff line number	Diff line change
`@@ -18,8 +18,9 @@ private void UpdateAttachedProperties()`
`18`	`18`	`associatedObject.Dispatcher`
`19`	`19`	`.BeginInvoke(() =>`
`20`	`20`	`{`
`21`		`- associatedObject.SetCurrentValue(TextFieldAssist.TextBoxLineCountProperty, associatedObject.LineCount);`
`22`		`- associatedObject.SetCurrentValue(TextFieldAssist.TextBoxIsMultiLineProperty, associatedObject.LineCount > 1);`
	`21`	`+ int lineCount = associatedObject.LineCount;`
	`22`	`+ associatedObject.SetCurrentValue(TextFieldAssist.TextBoxLineCountProperty, lineCount);`
	`23`	`+ associatedObject.SetCurrentValue(TextFieldAssist.TextBoxIsMultiLineProperty, lineCount > 1);`
`23`	`24`	`},`
`24`	`25`	`DispatcherPriority.Background);`
`25`	`26`	`}`