wpf ObservableCollection筛选功能

viewmodel中定义原始数据及筛选后的数据，筛选后的数据类型为ICollectionView

//原始数据列表
public ObservableCollection<SchoolOutDto> SchoolList { get; set; }

/// <summary>
/// 筛选数据后的列表
/// </summary>
public ICollectionView FilterSchoolList { get; set; }

//输入框绑定的值
public string SchoolText
{
    get => schoolText; set
    {
        schoolText = value;
        //根据筛选的名称刷新列表
        FilterSchoolList.Refresh();
    }
}

在原始数据获取到数据后绑定筛选后的数据

FilterSchoolList = CollectionViewSource.GetDefaultView(SchoolList);
FilterSchoolList.Filter = Filter;  //此处的Filter为一个回调函数

Filter

private bool Filter(object obj)
{
    var m = obj as SchoolOutDto;
    if (string.IsNullOrEmpty(SchoolText) )
    {
        return true;
    }

    //输入框与选择的列表一致时重置列表(此时为选择了某条数据直接重置)
    if (SelectedSchool != null && SelectedSchool.schoolName==SchoolText)
    {
        return true;
    }

    if (m.schoolName.Contains(SchoolText))
    {
        return true;
    }
    return false;
}