在 WPF 中过滤 DataGrid [英] Filter a DataGrid in WPF

问题描述

我用这个加载数据网格中的对象列表:

I load a lists of objects in a datagrid with this:

dataGrid1.Items.Add(model);

model 成为数据库中的数据.它有一个 Id(int)、Name(string) 和 Text(string)

The model become data from a database. It has a Id(int), Name(string) and Text(string)

在我的数据网格中，我只显示了 model 的名称.当我在文本框中输入内容时，我现在如何过滤数据网格?

In my datagrid I show only the Name of the model. How can I filter the datagrid now, when I enter something in a textbox?

我在这个页面:http://msdn.microsoft.com/en-us/library/vstudio/ff407126(v=vs.100).aspx 但我不明白那里的代码，我无法解释我应该如何转置那是我的问题.

I was at this page: http://msdn.microsoft.com/en-us/library/vstudio/ff407126(v=vs.100).aspx but I don't understand the code from there and I can not explain how I should transpose that for my problem.

推荐答案

有多种过滤集合的方式

让我们建议这是您的项目类别

let's suggesting this is your Item Class

public class Model
{
    public string Name
    {
        get;
        set;
    }
}

你的收藏看起来像

       var ObColl = new ObservableCollection<Model>();

        ObColl.Add(new Model() { Name = "John" });
        ObColl.Add(new Model() { Name = "Karl" });
        ObColl.Add(new Model() { Name = "Max" });
        ObColl.Add(new Model() { Name = "Mary" });

方式 1(谓词):

    public MainWindow()
    {
        InitializeComponent();

        // Collection which will take your ObservableCollection
        var _itemSourceList = new CollectionViewSource() { Source = ObColl };

        // ICollectionView the View/UI part 
        ICollectionView Itemlist = _itemSourceList.View;

        // your Filter
        var yourCostumFilter= new Predicate<object>(item => ((Model)item).Name.Contains("Max"));

        //now we add our Filter
        Itemlist.Filter = yourCostumFilter;

        dataGrid1.ItemsSource = Itemlist;
    }

方式 2 (FilterEventHandler):

    public MainWindow()
    {
        InitializeComponent();

        // Collection which will take your Filter
        var _itemSourceList = new CollectionViewSource() { Source = ObColl };

       //now we add our Filter
       _itemSourceList.Filter += new FilterEventHandler(yourFilter);

        // ICollectionView the View/UI part 
        ICollectionView Itemlist = _itemSourceList.View;

        dataGrid1.ItemsSource = Itemlist;
    }

    private void yourFilter(object sender, FilterEventArgs e)
    {
        var obj = e.Item as Model;
        if (obj != null)
        {
            if (obj.Name.Contains("Max"))
                e.Accepted = true;
            else
                e.Accepted = false;
        }
    }

将信息扩展到方式 1

如果需要多个条件或一些复杂的过滤器，您可以向您的 Predicat 添加一个方法

extended Information to Way 1

if need multiple conditions or some complex Filter you can add a method to your Predicat

    // your Filter
    var yourComplexFilter= new Predicate<object>(ComplexFilter);

    private bool ComplexFilter(object obj)
    {
        //your logic
    }

这篇关于在 WPF 中过滤 DataGrid的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！