WPF过滤器与ComboBox [英] WPF filter with ComboBox

问题描述

我刚刚接触WPF，我想用 CollectionView 和我的 ComboBox 控制过滤一些数据。 / p>

我到目前为止做了什么：

 < CollectionViewSource x：Key =TeleViewSource ={StaticResource TeleData}Filter =Filter> 
< CollectionViewSource.SortDescriptions> 
< scm：SortDescription PropertyName =contact_nameDirection =Ascending/> 
 
< /CollectionViewSource.SortDescriptions> 
 
< CollectionViewSource.GroupDescriptions> 
< dat：PropertyGroupDescription PropertyName =contact_grname/> 
 
< /CollectionViewSource.GroupDescriptions> 
  

CS：

  private int count = 0; 
 void Filter（object sender，FilterEventArgs e）
 {
 
 if（value ==|| value == null）
 {
 .Accepted = true; 
} 
 else 
 {
 
 System.Xml.XmlElement ele = e.Item as System.Xml.XmlElement; 
 string name = ele.SelectNodes（/ response / contacts / contact / contact_grname）[count] .InnerText; 
 count + = 1; 
 //MessageBox.Show（name）; 
 
 if（name ==group1）e.Accepted = true; 
 else e.Accepted = false; 
} 
} 
  

此代码成功过滤所有元素， $ c>

$ b> $ <$ p>

$ b>

包含所有 contact_grnames （XML绑定）？

  private void cmbGroup_SelectionChanged（object sender，SelectionChangedEventArgs e）
 {
 value = cmbGroup.SelectedValue.ToString（）; 
 lblGroupName.Content =Groupname：+ value; 
 
 CollectionViewSource cvs = FindResource（TeleView）as CollectionViewSource; 
} 
  

解决方案

您的 ComboBox ，根据所选项目过滤要显示的元素，调用过滤器它是在 ComboBox 中选择的值。

然后，刷新datagrid：

yourDataGrid.Items.Refresh ）; 。

和CollectionView：

  yourCollectionView.Refresh（）; 
  

此外，请查看 this 文章，解释 CollectionView 的功能。

I'm new to WPF and I want to filter some data with CollectionView with my ComboBox control.

What I have done so far:

<CollectionViewSource x:Key="TeleView"  Source="{StaticResource TeleData}" Filter="Filter" >
<CollectionViewSource.SortDescriptions>
    <scm:SortDescription PropertyName="contact_name" Direction="Ascending" />

</CollectionViewSource.SortDescriptions>

<CollectionViewSource.GroupDescriptions>
    <dat:PropertyGroupDescription PropertyName="contact_grname" />

</CollectionViewSource.GroupDescriptions>

CS:

private int count = 0;
void Filter(object sender, FilterEventArgs e)
{

    if (value == "" || value == null)
    {
        e.Accepted = true;
    }
    else
    {

        System.Xml.XmlElement ele = e.Item as System.Xml.XmlElement;
        string name = ele.SelectNodes("/response/contacts/contact/contact_grname")[count].InnerText;
        count += 1;
        //MessageBox.Show(name);

        if (name == "group1") e.Accepted = true;
        else e.Accepted = false;
    }
}

This code successfully filters all elements with the group1 text within my contact_grname element.

But how to bind to my ComboBox which contains all contact_grnames (XML binded) ?!

private void cmbGroup_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    value = cmbGroup.SelectedValue.ToString();
    lblGroupName.Content = "Groupname: " + value;

    CollectionViewSource cvs = FindResource("TeleView") as CollectionViewSource;
}

解决方案

Once you select an item in your ComboBox, filter the elements you want to show, according to the item selected, calling the Filter method, passing to it the value selected in the ComboBox.

Then, refresh the datagrid, with:

yourDataGrid.Items.Refresh();.

and the CollectionView with:

yourCollectionView.Refresh();

Furthermore, have a look to the this article, explaining the features of a CollectionView.

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