Fixing potential null reference exception. (#1037)

Keboo · web-flow · commit 73082b3b9d77 · 2018-09-09T09:50:48.000-07:00
Chaning Uri comparision to be case insensitive.
diff --git a/MaterialDesignThemes.Wpf/ThemeAssist.cs b/MaterialDesignThemes.Wpf/ThemeAssist.cs
@@ -27,7 +27,7 @@ private static void OnThemeChanged(DependencyObject @do, DependencyPropertyChang
                 {
                     foreach(ResourceDictionary resourceDictionary in element.Resources.MergedDictionaries)
                     {
-                        if (string.Equals(resourceDictionary.Source.ToString(), oldSource, StringComparison.Ordinal))
+                        if (string.Equals(resourceDictionary.Source?.ToString(), oldSource, StringComparison.OrdinalIgnoreCase))
                         {
                             element.Resources.MergedDictionaries.Remove(resourceDictionary);
                             break;

Original file line number	Diff line number	Diff line change
`@@ -27,7 +27,7 @@ private static void OnThemeChanged(DependencyObject @do, DependencyPropertyChang`
`27`	`27`	`{`
`28`	`28`	`foreach(ResourceDictionary resourceDictionary in element.Resources.MergedDictionaries)`
`29`	`29`	`{`
`30`		`- if (string.Equals(resourceDictionary.Source.ToString(), oldSource, StringComparison.Ordinal))`
	`30`	`+ if (string.Equals(resourceDictionary.Source?.ToString(), oldSource, StringComparison.OrdinalIgnoreCase))`
`31`	`31`	`{`
`32`	`32`	`element.Resources.MergedDictionaries.Remove(resourceDictionary);`
`33`	`33`	`break;`