Question

我有大约15个属性，每个控件绑定到数据库。

我的应用程序需要提供可以由客户端设置的HorizontalAlignment，VerticalAlignment，Margin，Background，Foreground，...........等属性。因此，我在数据库中创建了一个表，以便在客户端设置它们时保存这些属性的值。我在ViewModel的构造函数中检索该属性的值。

但是当我的应用程序运行时，它需要7到8分钟才能完全启动。

以下是我的代码的一小部分示例：

XAML

<TextBlock Grid.Row="{Binding HaemogramRowHaemoglobinTest}" Grid.Column="{Binding HaemogramColumnHaemoglobinTest}"
           Grid.RowSpan="{Binding HaemogramRowSpanHaemoglobinTest}" Grid.ColumnSpan="{Binding HaemogramColumnSpanHaemoglobinTest}"
           Text="{Binding HaemogramTextHaemoglobinTest}" 
           Visibility="{Binding HaemogramVisibilityHaemoglobinTest, Converter={StaticResource booleanToVisibilityConverter}}"
           Background="{Binding HaemogramBackgroundHaemoglobinTest, Converter={StaticResource colorNameToSolidColorBrushConverter}}" 
           Foreground="{Binding HaemogramForegroundHaemoglobinTest, Converter={StaticResource colorNameToSolidColorBrushConverter}}"
           FontFamily="{Binding HaemogramFontNameHaemoglobinTest, Converter={StaticResource stringToFontFamilyConverter}}" 
           FontSize="{Binding HaemogramFontSizeHaemoglobinTest}"
           FontWeight="{Binding HaemogramFontBoldHaemoglobinTest, Converter={StaticResource booleanToBoldConverter}}" 
           FontStyle="{Binding HaemogramFontItalicsHaemoglobinTest, Converter={StaticResource booleanToItalicsConverter}}"
           TextDecorations="{Binding HaemogramFontUnderlineHaemoglobinTest, Converter={StaticResource booleanToUnderlineConverter}}"
           HorizontalAlignment="{Binding HaemogramHorizontalAlignmentHaemoglobinTest, Converter={StaticResource intToHorizontalAlignmentConverter}}" 
           VerticalAlignment="{Binding HaemogramVerticalAlignmentHaemoglobinTest, Converter={StaticResource intToVerticalAlignmentConverter}}"
           Margin="{Binding HaemogramMarginHaemoglobinTest}" >

视图模型

public MainWindowViewModel()
{
    using (Lab_Lite_Entities db = new Lab_Lite_Entities())
    {
        HaemogramRowTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.ParentGridRow).FirstOrDefault();
        HaemogramColumnTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.ParentGridColumn).FirstOrDefault();
        HaemogramRowSpanTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.ParentGridRowSpan).FirstOrDefault();
        HaemogramColumnSpanTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.ParentGridColumnSpan).FirstOrDefault();
        HaemogramTextTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.TextField).FirstOrDefault();
        HaemogramVisibilityTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.Visibility).FirstOrDefault();
        HaemogramBackgroundTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.BackgoundColour).FirstOrDefault();
        HaemogramForegroundTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.TextColour).FirstOrDefault();
        HaemogramFontNameTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.FontName).FirstOrDefault();
        HaemogramFontSizeTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.FontSize).FirstOrDefault();
        HaemogramFontBoldTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.Bold).FirstOrDefault();
        HaemogramFontItalicsTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.Italics).FirstOrDefault();
        HaemogramFontUnderlineTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.Underline).FirstOrDefault();
        HaemogramHorizontalAlignmentTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.HorizontalAlignment).FirstOrDefault();
        HaemogramVerticalAlignmentTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.VerticalAlignment).FirstOrDefault();
        double? HaemogramMarginLeftTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.MarginLeft).FirstOrDefault();
        double? HaemogramMarginTopTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.MarginTop).FirstOrDefault();
        double? HaemogramMarginRightTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.MarginRight).FirstOrDefault();
        double? HaemogramMarginBottomTest = db.Designs.Where(d => d.MasterPage.Value == "Haemogram Report" && d.FieldName == "Test").Select(d => d.MarginBottom).FirstOrDefault();
        HaemogramMarginTest = new Thickness((double)HaemogramMarginLeftTest, (double)HaemogramMarginTopTest, (double)HaemogramMarginRightTest, (double)HaemogramMarginBottomTest);
    }
}

...

...

And the properties are declared with implementation of OnPropertyChanged.

现在问题是有超过1500个属性，其值来自ViewModel的构造函数。由于我的申请变得非常慢。

有没有办法让应用程序更快一些？

Answer 1

您似乎有很多冗余的数据库选择。稍微重写块应该可以提高性能。我不确定您的数据类型，所以我在下面的字段中使用了默认null;

public MainWindowViewModel()
{
    using (Lab_Lite_Entities db = new Lab_Lite_Entities())
    {
        // A single select from the database
        var design = db.Designs.FirstOrDefault(
            d => d.MasterPage.Value == "Haemogram Report" && 
                 d.FieldName == "Test");

        // Build your members from that select
        HaemogramRowTest    = design != null ? design.ParentGridRow : null;
        HaemogramColumnTest = design != null ? design.ParentGridColumn : null;
        ...

我的申请变得很慢

1 个答案: