c# WPF combobox select 當 ItemsSource 綁定時

Question

我在 combobox 中以編程方式嘗試 select 項目，其中項目源綁定到 xml 文件。 問題是 combobox.SelectedItem 或 combobox.SelectedValue 不起作用。 有人有什么建議嗎？

我的 SectionComboBox 項目依賴於選定的 TypeCombobox 項目。 在某些情況下，我想從字符串中同時設置 combobox 選擇。

XAML：

<ComboBox ItemsSource="{Binding}" DisplayMemberPath="ProfileType.Type"  IsSynchronizedWithCurrentItem="True" 
Name="TypeCombobox" HorizontalAlignment="Left" 
Margin="250,5,0,0" VerticalAlignment="Top" Width="50" Height="20" VerticalContentAlignment="Center" 
SelectionChanged="TypeCombobox_SelectionChanged" 
SelectedValuePath="Content" SelectedItem="{Binding SelectedType}"/>
 
<ComboBox ItemsSource="{Binding SelectedItem.ProfileSection, ElementName=TypeCombobox}" 
DisplayMemberPath="Section" 
IsSynchronizedWithCurrentItem="True"  Name="SectionComboBox" 
HorizontalAlignment="Left" Margin="310,5,0,0" VerticalAlignment="Top" 
Width="140" Height="20" VerticalContentAlignment="Center" SelectionChanged="SectionComboBox_SelectionChanged" 
SelectedValuePath="Content" SelectedItem="{Binding SelectedSection}"/>

XML：

<?xml version="1.0" encoding="utf-8" ?>
<SteelProfiles>
<Profile>
<ProfileType Name="UB" />
<ProfileSection Name="127x76x13" />
<ProfileSection Name="152x89x16" />
<ProfileSection Name="178x102x19" />
<ProfileSection Name="203x102x23" />
<ProfileSection Name="203x133x25" />
<ProfileSection Name="203x133x30" />
<ProfileSection Name="254x102x22" />
<ProfileSection Name="254x102x25" />
<ProfileSection Name="254x102x28" />
<ProfileSection Name="254x146x31" />
</Profile>
<Profile>
<ProfileType Name="PFC" />
<ProfileSection Name="100x50x10" />
<ProfileSection Name="125x65x15" />
<ProfileSection Name="150x75x18" />
<ProfileSection Name="150x90x24" />
<ProfileSection Name="180x75x20" />
<ProfileSection Name="180x90x26" />
<ProfileSection Name="200x75x23" />
<ProfileSection Name="200x90x30" />
<ProfileSection Name="230x75x26" />
<ProfileSection Name="230x90x32" />
<ProfileSection Name="260x75x28" />
<ProfileSection Name="260x90x35" />
<ProfileSection Name="300x90x41" />
<ProfileSection Name="300x100x46" />
<ProfileSection Name="380x100x54" />
<ProfileSection Name="430x100x64" />
</Profile>
</SteelProfiles>

SteelProfile.sc

namespace SteelWork
{
    [XmlRoot(ElementName = "SteelProfiles")]
    public class SteelProfiles
    {
        [XmlElement(ElementName = "Profile")]
        public List<Profile> Profile { get; set; }
    }

    [XmlRoot(ElementName = "Profile")]
    public class Profile
    {
        [XmlElement(ElementName = "ProfileType")]
        public ProfileType ProfileType { get; set; }
        [XmlElement(ElementName = "ProfileSection")]
        public List<ProfileSection> ProfileSection { get; set; }
    }


    [XmlRoot(ElementName = "ProfileType")]
    public class ProfileType
    {
        [XmlAttribute(AttributeName = "Name")]
        public string Type { get; set; }

    }
    [XmlRoot(ElementName = "ProfileSection")]
    public class ProfileSection
    {
        [XmlAttribute(AttributeName = "Name")]
        public string Section { get; set; }

    }
}

Xaml后面：

public partial class SteelProperties : Window
{
    public static SteelCarpentryTruss SteelTruss { get; set; }
    public string SelectedType { get; set; }
    public string SelectedSection { get; set; }
    public SteelProperties(ObjectId carpentyTrussId)
    {
        InitializeComponent();

        SteelProfiles steelProfiles = null;
        string path = @"C:\Program Files\Autodesk\ApplicationPlugins\SteelWork.bundle\Support\SteelProfiles.xml";
        XmlSerializer serializer = new XmlSerializer(typeof(SteelProfiles));
        StreamReader reader = new StreamReader(path);
        steelProfiles = (SteelProfiles)serializer.Deserialize(reader);
        reader.Close();
        TypeCombobox.ItemsSource = steelProfiles.Profile;

        TypeCombobox.SelectedIndex = 1;
        Document doc = Application.DocumentManager.MdiActiveDocument;
        var tr = doc.TransactionManager.StartTransaction();
        using (tr)
        {
            SteelTruss = new SteelCarpentryTruss(tr, carpentyTrussId);
            ACAStdFunctions.ScheduleData.SetPropertyValueOnEntity(tr, SteelTruss.CarpentryTruss, "Steel", "Name", SteelTruss.TrussName);
            NameTextBox.Text = SteelTruss.TrussName;

            if (SteelTruss.Section != null && SteelTruss.Section != "")
            {

                string sectiontype = SteelTruss.SectionType;
                TypeCombobox.SelectedItem = sectiontype;
                string sectionProfile = SteelTruss.SectionProfile;
                SectionComboBox.SelectedItem = sectionProfile;


            }

            tr.Commit();
        }
        

    }

Answer 1

好的，我自己解決了這個問題。 問題是我嘗試將項目設置為字符串。 我修改了代碼以將正確的配置文件 object 設置為 combobox。

if (SteelTruss.Section != null && SteelTruss.Section != "")
   {
   Profile profile = steelProfiles.Profile.SingleOrDefault
          (item => item.ProfileType.Type == SteelTruss.SectionType);
   TypeCombobox.SelectedItem = profile;
   SectionComboBox.SelectedItem = profile.ProfileSection.SingleOrDefault
          (item => item.Section == SteelTruss.SectionProfile);
    }