BlogJava-Java,永远不敢言精通-随笔分类-WPF

在ViewModel里如何获得该View里某控件的引用

Ying-er — Fri, 19 Jun 2015 04:24:00 GMT

两点：
①：给该控件起个奇葩点的名字（目的是不要与别的控件重名）
②：叫醒你的控件，对，它就睡在Application.Current.Windows里！
注：该方法杀伤力巨大，有悖MVVM设计初衷，应尽量避开

foreach (Window win in Application.Current.Windows)
                        {
                            dataGrid = win.FindName("_vwMarkDatagrid") as DataGrid;
                            if (dataGrid != null && selectMark.MarkID != currentMarkID)
                            {
                                isFromMap = true;
                                currentMarkID = selectMark.MarkID;
                                dataGrid.SelectedItem = selectMark;
                                dataGrid.ScrollIntoView(selectMark);

                                break;
                            }
                        }

Ying-er 2015-06-19 12:24 发表评论

WPF 如何假装不是ListView——去列头，去高亮

Ying-er — Thu, 11 Jun 2015 03:08:00 GMT

                            <ListView.Resources>
                                <Style TargetType="GridViewColumnHeader">
                                    <Setter Property="Visibility" Value="Collapsed" />
                                Style>
                            ListView.Resources>

                            <ListView.ItemContainerStyle>
                                <Style TargetType="{x:Type ListViewItem}">
                                    <Setter Property="Background" Value="Transparent" />
                                    <Setter Property="Template">
                                        <Setter.Value>
                                            <ControlTemplate TargetType="{x:Type ListViewItem}">
                                                <Border BorderBrush="Transparent"
                                                                    BorderThickness="0"
                                                                    Background="{TemplateBinding Background}">
                                                    <GridViewRowPresenter
                                                                    HorizontalAlignment="Stretch"
                                                                    VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                                                    Width="Auto"
                                                                    Margin="0,3,0,0"
                                                                    Content="{TemplateBinding Content}"/>
                                                Border>
                                            ControlTemplate>
                                        Setter.Value>
                                    Setter>
                                Style>
                            ListView.ItemContainerStyle>

Ying-er 2015-06-11 11:08 发表评论

说说WPF ListView里的selected三兄弟——SelectedItem,SelectedValue,SelectedValuePath

Ying-er — Thu, 11 Jun 2015 02:55:00 GMT

这是一篇懒文:)
只因在大名鼎鼎的stackoverflow上遇到了牛逼哄哄的 Chris Anderson
下面我们来看看牛人是怎样火眼金睛识破这三个神秘家伙的：
以下内容完全转自stackoverflow

Their names can be a bit confusing :). Here's a summary:

The SelectedItem property returns the entire object that your list is bound to. So say you've bound a list to a collection of Category objects (with each Category object having Name and ID properties). eg. ObservableCollection. The SelectedItem property will return you the currently selected Category object. For binding purposes however, this is not always what you want, as this only enables you to bind an entire Category object to the property that the list is bound to, not the value of a single property on that Category object (such as its ID property).
Therefore we have the SelectedValuePath property and the SelectedValue property as an alternative means of binding (you use them in conjunction with one another). Let's say you have aProduct object, that your view is bound to (with properties for things like ProductName, Weight, etc). Let's also say you have a CategoryID property on that Product object, and you want the user to be able to select a category for the product from a list of categories. You need the ID property of the Category object to be assigned to the CategoryID property on the Product object. This is where the SelectedValuePath and the SelectedValue properties come in. You specify that the ID property on the Category object should be assigned to the property on the Product object that the list is bound to using SelectedValuePath='ID', and then bind the SelectedValueproperty to the property on the DataContext (ie. the Product).

The example below demonstrates this. We have a ComboBox bound to a list of Categories (via ItemsSource). We're binding the CategoryID property on the Product as the selected value (using the SelectedValue property). We're relating this to the Category's ID property via the SelectedValuePath property. And we're saying only display the Name property in the ComboBox, with the DisplayMemberPath property).

It's a little confusing initially, but hopefully this makes it a bit clearer... :)

Chris

Ying-er 2015-06-11 10:55 发表评论