使用Resources.BeginInit（）更新ResourceDictionary

Question

我正在后面的代码中更新资源（合并字典和更改ResourceKey值）。我读过某个地方，应该在这两行Resources.BeginInit()和Resources.EndInit()之间写下所有ResourceDictionary更改，以确保在完成所有更改之前不应用DynamicResources。

对于资源键的更新或从合并字典中添加/删除资源时，谁能提供更多的说明？

示例：

    private void _replaceResourceDictionary(ResourceDictionary newResource, ResourceDictionary oldResource)
    {
         double newDefaultFontSize = 15.0;

        //This info may be incorrect: Using Begin & End ensures that DynamicResources are not refresh multiple times
        Application.Current.Resources.BeginInit();
        _removeFromMergedDictionaries(oldResource);
        _addToMergedDictionaries(newResource);
        Application.Current.Resources.EndInit();

       //Question: Does using Begin & End will benefit here as well?
        Application.Current.Resources.BeginInit();
        Application.Current.Resources["FontSize_Small"] = newDefaultFontSize - 2;
        Application.Current.Resources["FontSize_Default"] = newDefaultFontSize;
        Application.Current.Resources["FontSize_DefaultPlus"] = newDefaultFontSize + 2;
        Application.Current.Resources["FontSize_HeaderNormal"] = newDefaultFontSize + 4;
        Application.Current.Resources["FontSize_HeaderLarge"] = newDefaultFontSize + 6;
        Application.Current.Resources["FontSize_MenuItem"] = newDefaultFontSize + 12;
        Application.Current.Resources.EndInit();
    }

谢谢

RDV