小编VAR*_*RAK的帖子

我的数据库中有一个查找表和一个数据表.我将以性别和人为例.所以,让我们说性别表看起来像这样:

Id         Code
1          Male
2          Female

而person表看起来像这样:

Id         Name             GenderId
1          Bob              1
2          Jane             2

我首先在EF代码中为这两个表建模,如下所示:

public class Gender
{
    public int Id {get;set;}
    public string Code {get;set;}
}

public class Person
{
    public int Id {get;set;}
    public string Name {get;set;}
    public int GenderId {get;set;}

    public virtual Gender {get;set;}
}

如果我读了一个已经在数据库中的人,那么我可以访问person.Gender.Code没有问题.如果我这样做:

var person = new Person
             {
                 Name = "Bob",
                 GenderId = 1,
             };

context.People.Add(person);
context.SaveChanges();

var code = person.Gender.Code;

然后它会正确保存但在最后一行会失败,因为性别为空.如果我然后打开一个新的上下文并加载保存的实体,那么最后一行工作正常.是否有一种方法可以在保存后直接访问性别,就好像我刚从数据库加载实体一样？

我有一个如下定义的类:

[XmlRoot("ClassName")]
public class ClassName_0
{
    //stuff...
}

然后我创建一个ClassName_0列表,如下所示:

var myListInstance= new List<ClassName_0>();

这是我用来序列化的代码:

var ser = new XmlSerializer(typeof(List<ClassName_0>));
ser.Serialize(aWriterStream, myListInstance);

这是我用来反序列化的代码:

var ser = new XmlSerializer(typeof(List<ClassName_0>));
var wrapper = ser.Deserialize(new StringReader(xml));

如果我将它序列化为xml,则生成的xml如下所示:

<?xml version="1.0" encoding="utf-8"?>
<ArrayOfClassName_0 xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <ClassName_0>
        <stuff></stuff>
    </ClassName_0>
    <ClassName_0>
        <stuff></stuff>
    </ClassName_0>
</ArrayOfClassName_0>

有没有办法序列化并能够从/向ClassName_0列表反序列化以下内容？

<?xml version="1.0" encoding="utf-8"?>
<ArrayOfClassName xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <ClassName>
        <stuff></stuff>
    </ClassName>
    <ClassName>
        <stuff></stuff>
    </ClassName>
</ArrayOfClassName>

谢谢!

我在app.xaml中为组合框定义了一个全局样式,如下所示:

<Style x:Key="{x:Type ComboBox}" TargetType="ComboBox">
    <Setter Property="SnapsToDevicePixels" Value="true"/>
    <Setter Property="OverridesDefaultStyle" Value="true"/>
    <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
    <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
    <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
    <Setter Property="MinHeight" Value="20"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ComboBox">
                <Grid Width="{TemplateBinding Width}">
                    <ToggleButton 
                                        Name="ToggleButton" 
                                        Template="{StaticResource ComboBoxToggleButton}" 
                                        Grid.Column="2" 
                                        Focusable="false"
                                        IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}"
                                        ClickMode="Press">
                    </ToggleButton>
                    <ContentPresenter
                                        Name="ContentSite"
                                        IsHitTestVisible="False" 
                                        Content="{TemplateBinding SelectionBoxItem}"
                                        ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
                                        ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
                                        Margin="3,3,23,3"
                                        VerticalAlignment="Center"
                                        HorizontalAlignment="Left" />
                    <TextBox x:Name="PART_EditableTextBox"
                                        Style="{x:Null}" 
                                        Template="{StaticResource ComboBoxTextBox}" 
                                        HorizontalAlignment="Left" 
                                        VerticalAlignment="Center" 
                                        Margin="3,3,23,3"
                                        Focusable="True" 
                                        Background="Transparent"
                                        Visibility="Hidden"
                                        IsReadOnly="{TemplateBinding IsReadOnly}"/>
                    <Popup 
                                        Name="Popup"
                                        Placement="Bottom"
                                        IsOpen="{TemplateBinding IsDropDownOpen}"
                                        AllowsTransparency="True" 
                                        Focusable="False"
                                        PopupAnimation="Slide">
                        <Grid 
                                            Name="DropDown"
                                            SnapsToDevicePixels="True"                
                                            MinWidth="{TemplateBinding …

我正在尝试按照以下说明调用Google的OAuth2身份验证服务:https://developers.google.com/accounts/docs/OAuth2ForDevices

我将所有必需的参数放入查询字符串并发送请求.这适用于"获取用户代码"部分,但不适用于"获取访问和刷新令牌"部分.

经过多次游戏并获得400 Bad Request错误后,我发现,您可以使用FormUrlEncodedContent创建请求,而不是将数据放入查询字符串中,并通过application\x-www-form-urlencoded将内容作为内容发送内容类型.

这是以前的代码:

var requestMessage = new HttpRequestMessage();
requestMessage.Method = "POST";
requestMessage.RequestUri = new Uri(fullUrl);

其中fullUrl是这样的:

https://accounts.google.com/o/oauth2/device/code?client_id=812741506391-h38jh0j4fv0ce1krdkiq0hfvt6n5amrf.apps.googleusercontent.com&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.email%20https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fuserinfo.profile

新代码是:

var requestMessage = new HttpRequestMessage();
requestMessage.Method = "POST";
requestMessage.RequestUri = new Uri(url);
requestMessage.Content = new FormUrlEncodedContent(CreateDictionary(queryStringNames, queryStringValues));

网址是:

https://accounts.google.com/o/oauth2/device/code

queryStringNames和queryStringValues是所需参数的名称和值的字符串数组.

这两种方法有什么区别？是否可以安全地假设所有POST调用都可以使用URL编码内容请求而不是将数据放入查询字符串中？

我有一个带有一堆值的组合框.我想在选择"列表"时更改组合框的宽度.这是我目前的xaml:

<ComboBox Name="DataTypeSelector" ItemsSource="{Binding ElementName=DataItemsBuildWindow, Path=DataContext.Types}" SelectedValue="{Binding DataType}" HorizontalAlignment="Stretch" Width="160">
    <ComboBox.Style>
        <Style TargetType="ComboBox">
            <Style.Triggers>
                <DataTrigger Value="List" Binding="{Binding SelectedValue, ElementName=DataTypeSelector, Converter={StaticResource ToStringConverter}}">
                    <Setter Property="Width" Value="80" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </ComboBox.Style>
</ComboBox>

由于某种原因,这不起作用.

如果我将Setter更改为:

<Setter Property="Visibility" Value="Hidden" />

然后在选择"列表"时隐藏组合框.为什么它不适合宽度？