C# 筛选和ICollectionView筛选WPF
我目前有一个C# 筛选和ICollectionView筛选WPF,c#,wpf,filter,datagrid,C#,Wpf,Filter,Datagrid,我目前有一个DataGrid，里面装满了我根据两件事筛选的公司——一个是搜索框，用户可以根据公司名称、城镇或邮政编码进行筛选。这看起来像这样, 按姓名/城镇/邮政编码过滤 private void FilterDataGrid() { try { var searchText = CharactersOnly(searchBox.Text); Compa
DataGrid private void FilterDataGrid()
{
try
{
var searchText = CharactersOnly(searchBox.Text);
CompanyICollectionView.Filter = (obj =>
{
CompanyModel compDetails = obj as CompanyModel;
if (compDetails == null)
{
return true;
}
if (compNameRad.IsChecked == true)
{
return CompanyContains(compDetails.Name, searchText.ToLower());
}
if (compTownRad.IsChecked == true)
{
return CompanyContains(compDetails.Town, searchText.ToLower());
}
if (compPcodeRad.IsChecked == true)
{
return CompanyContains(compDetails.Postcode, searchText.ToLower());
}
return false;
});
if (dataGrid.Items.Count == 0) // There are no companies with this filter on, clear the label
{
compDetailsLabel.Content = string.Empty;
}
else
{
dataGrid.SelectedIndex = 0;
}
}
catch (Exception ex)
{
var hEs = new HandleExceptionService();
hEs.HandleException(ex.ToString());
}
}
private void FilterCompanyType(object sender, RoutedEventArgs e)
{
criteria.Clear();
if (currentCheckBox.IsChecked == true && nonCurrentCheckBox.IsChecked == false)
{
criteria.Add(new Predicate<CompanyModel>(x => x.CurrentStatus == 1));
}
else if (nonCurrentCheckBox.IsChecked == true && currentCheckBox.IsChecked == false)
{
criteria.Add(new Predicate<CompanyModel>(x => x.CurrentStatus == 0));
}
else if (nonCurrentCheckBox.IsChecked == true && currentCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => (x.CurrentStatus == 1 || x.CurrentStatus == 0)));
}
if (subbieCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.Subcontractor == 1));
}
if (supplierCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.Supplier == 1));
}
if (planthireCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.Planthire == 1));
}
if (architectCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.Architect == 1));
}
if (qsCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.QS == 1));
}
if (projectManagerCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.ProjectManager == 1));
}
if (structEngCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.StructEng == 1));
}
if (servEngCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.ServiceEng == 1));
}
foreach (CheckBox checkBox in companyFilters.Children)
{
if (!CheckCheckBoxes())
{
dataGrid.ItemsSource = null;
compDetailsLabel.Content = string.Empty;
}
else
{
dataGrid.ItemsSource = CompanyICollectionView;
CompanyICollectionView.Filter = dynamic_Filter;
SetSelectedCompany(selectedIndex);
dataGrid.SelectedIndex = 0;
}
}
var nfi = (NumberFormatInfo)CultureInfo.InvariantCulture.NumberFormat.Clone();
nfi.NumberGroupSeparator = ",";
numberOfCompaniesLabel.Content = "Number of Companies: " + dataGrid.Items.Count.ToString("#,#", nfi);
}
复选框来完成的。这个方法看起来像这样
按公司类型筛选
private void FilterDataGrid()
{
try
{
var searchText = CharactersOnly(searchBox.Text);
CompanyICollectionView.Filter = (obj =>
{
CompanyModel compDetails = obj as CompanyModel;
if (compDetails == null)
{
return true;
}
if (compNameRad.IsChecked == true)
{
return CompanyContains(compDetails.Name, searchText.ToLower());
}
if (compTownRad.IsChecked == true)
{
return CompanyContains(compDetails.Town, searchText.ToLower());
}
if (compPcodeRad.IsChecked == true)
{
return CompanyContains(compDetails.Postcode, searchText.ToLower());
}
return false;
});
if (dataGrid.Items.Count == 0) // There are no companies with this filter on, clear the label
{
compDetailsLabel.Content = string.Empty;
}
else
{
dataGrid.SelectedIndex = 0;
}
}
catch (Exception ex)
{
var hEs = new HandleExceptionService();
hEs.HandleException(ex.ToString());
}
}
private void FilterCompanyType(object sender, RoutedEventArgs e)
{
criteria.Clear();
if (currentCheckBox.IsChecked == true && nonCurrentCheckBox.IsChecked == false)
{
criteria.Add(new Predicate<CompanyModel>(x => x.CurrentStatus == 1));
}
else if (nonCurrentCheckBox.IsChecked == true && currentCheckBox.IsChecked == false)
{
criteria.Add(new Predicate<CompanyModel>(x => x.CurrentStatus == 0));
}
else if (nonCurrentCheckBox.IsChecked == true && currentCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => (x.CurrentStatus == 1 || x.CurrentStatus == 0)));
}
if (subbieCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.Subcontractor == 1));
}
if (supplierCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.Supplier == 1));
}
if (planthireCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.Planthire == 1));
}
if (architectCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.Architect == 1));
}
if (qsCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.QS == 1));
}
if (projectManagerCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.ProjectManager == 1));
}
if (structEngCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.StructEng == 1));
}
if (servEngCheckBox.IsChecked == true)
{
criteria.Add(new Predicate<CompanyModel>(x => x.ServiceEng == 1));
}
foreach (CheckBox checkBox in companyFilters.Children)
{
if (!CheckCheckBoxes())
{
dataGrid.ItemsSource = null;
compDetailsLabel.Content = string.Empty;
}
else
{
dataGrid.ItemsSource = CompanyICollectionView;
CompanyICollectionView.Filter = dynamic_Filter;
SetSelectedCompany(selectedIndex);
dataGrid.SelectedIndex = 0;
}
}
var nfi = (NumberFormatInfo)CultureInfo.InvariantCulture.NumberFormat.Clone();
nfi.NumberGroupSeparator = ",";
numberOfCompaniesLabel.Content = "Number of Companies: " + dataGrid.Items.Count.ToString("#,#", nfi);
}
你是对的，问题是你每次都在重置过滤器。因此，您需要进行一些修改以解决问题（我假设所有代码都在同一个类中）：
私有布尔过滤器公司信息（对象o）{
//如果选择的信息和过滤器（名称、城镇、代码等）对应于对象o（铸造为公司模型），则返回true的函数
//我让你写这部分，应该像filterCompanyType方法一样。
}
私有布尔筛选器公司类型（对象o）{
标准。清除（）；
if（currentCheckBox.IsChecked==true&&nonCurrentCheckBox.IsChecked==false）
{
Add（新谓词（x=>x.CurrentStatus==1））；
}
else if（nonCurrentCheckBox.IsChecked==true&¤tCheckBox.IsChecked==false）
{
Add（新谓词（x=>x.CurrentStatus==0））；
}
else if（nonCurrentCheckBox.IsChecked==true&¤tCheckBox.IsChecked==true）
{
添加（新谓词（x=>（x.CurrentStatus==1 | | x.CurrentStatus==0））；
}
//……这里的所有其他标准
CompanyModel company=o作为CompanyModel；
bool-isIn=true；
if（criteria.Count（）==0）
返回isIn；
isIn=criteria.TrueForAll（x=>x（公司））；
返回isIn；
}
私人布尔过滤器公司（对象o）{
返回filterCompanyType（o）和filterCompanyInfos（o）
}
public void ApplyFilter（集合视图公司集合视图）{
CompanyICollectionView.Filter=this.FilterCompany；
//做一些其他的事情，比如选择索引。。。
}
无需在每次属性更改时重新创建筛选器。
最好的方法是将两个过滤器组合在一个函数中，将其传递给companyCollectionView.Filter
，并从属性更改事件调用companyCollectionView.Refresh（）。
您甚至可以将collectionview绑定到支持筛选的ObservableCollection，即FilteredObservableCollection。。。
看看：
两个筛选器是否使用相同的项目源？DataGrid
具有相同的ItemsSource
是，（companyCollectionView
）您的动态\u筛选器从何而来？根据标准创建
？添加了一个编辑。感谢您的回答。我对过滤公司信息有点不确定。这是否与我的方法相同，用户可以搜索姓名、城镇、代码等？或者该部分是否也需要位于FilterCompanyType
中？filterCompanyInfos方法是关于按名称/城镇/邮政编码过滤。您需要对其进行调整，以便在尊重过滤器时，此函数为对象返回true我如何比较对象以确保其与已选择的过滤器匹配？