将列表框绑定到绑定列表，对项目属性进行过滤 [英] Binding Listbox to bindinglist, filter on item property

问题描述

我正在使用Winforms应用程序，并且有一个要绑定到列表框的对象的绑定列表.我可以执行此操作，但是接下来要做的是仅显示具有特定属性的项.

I'm working on a Winforms application and I have a bindinglist of objects that I want to bind to a listbox. I got this to work, but what I want to do next, is only display items where a particular property is true.

所以我有一个带有绑定列表的类

So I have a class with a bindinglist

class DataBuilder
{    
    public BindingList<TableSet> allTableSets = new BindingList<TableSet>();
}

还有一个带有某些属性的类TableSet

And a class TableSet with some properties

class TableSet
{
    public string TableSetName {get; set;}
    public bool IsPopulated {get; set;}
}

现在在我的表单上，我想将一个列表框绑定到allTableSet，但是只显示IsPopulated == true

And now on my form, I want to bind a listbox to the allTableSets, but only show the items where IsPopulated == true

到目前为止，我的表单上只显示了allTableSets列表中的所有项目

What I have so far on my form just shows all the items in the allTableSets list

public partial class MainForm : Form
{
    DataBuilder dataBuilder = new DataBuilder();
    {
        this.populatedTableSetsListBox.DataSource = dataBuilder.allTableSets;
        this.populatedTableSetsListBox.DisplayMember = "TableSetName";
    }
}

我一直在网上浏览，但是没有发现任何与我尝试做的事情相似的事情.任何建议或替代方法都将不胜感激.谢谢

I've been looking around the web but haven't found anything that seems similar to what I"m trying to do. Any suggestions or alternate methods are greatly appreciated. Thank you

推荐答案

尝试一下:在您的DataBuilder类中，有一个函数可以根据您的过滤条件返回项的子集.

Try this: in your DataBuilder class, have a function that returns a subset of your items based on your filter condition.

例如，在您的DataBuilder类中:

    public BindingList<TableSet> someTableSets()
    {
        BindingList<TableSet> someTableList = new BindingList<TableSet>();
        foreach (TableSet TS in allTableSets)
            if (TS.IsPopulated == true)
                someTableList.Add(TS);
        return someTableList;
    }

然后，在您的MainForm中，将其设置为等于someTableSets()函数的结果，而不是将DataSource设置为allTableSets:

Then, in your MainForm, instead of setting the DataSource to allTableSets, set it equal to the result of the someTableSets() function:

    this.populatedTableSetsListBox.DataSource = dataBuilder.someTableSets();

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