当 DataSource 是 BindingList 时过滤 BindingSource [英] Filter BindingSource when DataSource is a BindingList

问题描述

我从 excel 表中读取并为 BindingList 编写了此内容，在 Form_Load 中将其设置为 DataSource 作为 BindingSource:

I have read from a excel sheet and wrote this for a BindingList, in Form_Load this is set to a DataSource as BindingSource:

bd = new BindingSource(); //instance of BindingSource
bd.DataSource = ExcelOPS.LerExcel(); //LerExcel() method return a BindingList<T>

gvFiltro.DataSource = bd; //set a DataGridView named gvFiltro DataSource property
bindNav.BindingSource = bd; //set a BindingNavigator source

这项工作很好！我打算为此 DataGridView gvFiltro 创建一个组合框作为过滤器，因此在组合框的 SelectedIndexChanged 事件中，我尝试这样做:

This work fine! I intent to create a combobox as filter for this DataGridView gvFiltro, so in SelectedIndexChanged event of combobox, I try this:

this.gvFiltro.DataSource = null;
bd.Filter = string.Format("TAG_FAZENDA like '%{0}%'", cbTagFaz.Text);
gvFiltro.DataSource = bd;
gvFiltro.Update();
gvFiltro.Refresh();

bindNav.BindingSource = bd;
bindNav.Update();
bindNav.Refresh();

但是 DataGridView 不会改变.我错过了什么?

But the DataGridView don't change. I missed something?

推荐答案

您不能使用 Filter 属性来过滤 BindingSource 它是 DataSource 设置为 BindingList.

You can not use Filter property to filter a BindingSource which it's DataSource is set to a BindingList<T>.

仅实现 IBindingListView 接口的底层列表支持过滤.

Only underlying lists that implement the IBindingListView interface support filtering.

您可以使用 Linq 过滤 BindingList:

You can filter the BindingList<T> using Linq:

var filteredBindingList= new BindingList<T>(bindingList.Where(x=>some criteria).ToList());

然后您可以使用过滤后的绑定列表作为数据源.

Then you can use filtered binding list as data source.

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