绑定列表< Double>到WinForms-Listbox [英] Bind List<Double> to WinForms-Listbox

问题描述

我有一个小（可能是愚蠢的）数据绑定的问题。我尝试绑定列表

 列表< double> _measuredValues = new List< double>（）; 
  

到一个winforms ListBox。

Form_Load我设置：

  lstMeasuredValues.DataSource = _measuredValues; 
  

当我更新值时，没有任何内容出现？

  _measuredValues.Add（numBuffer）; 
  

我想到的一件事是数据类型问题。但是如何更改类型以将其更改为字符串？

  lstMeasuredValues.DataSource = _measuredValues.ToString（）。ToList （）; 
  

另一个原因可能是代码的上一行在另一个线程中。但我认为这不应该是问题。

如何绑定此列表？

解决方案

当我更新值时，没有任何显示？

_measuredValues.Add（numBuffer）;

为了允许UI反映数据源修改，数据源必须提供某种更改通知。 WinForms列表数据绑定基础架构使用 ListChanged事件 IBindingList接口。有一个标准提供了 BindingList 可以代替 List< T> 来获得所需的行为。所有你需要改变这一行

 列表< double> _measuredValues = new List< double>（）; 
  

至

  BindingList< double> _measuredValues = new BindingList< double>（）; 
  

另一个原因可能是代码的上一行在另一个线程。但我认为这不应该是问题。

这不好。 必须确保您不这样做，因为 ListChanged 事件预计将在UI线程上引发。

I have an small (probably dumb) issue with databinding. I try to bind a List

List<double> _measuredValues = new List<double>();

to a winforms ListBox.

In Form_Load I set:

lstMeasuredValues.DataSource = _measuredValues;

When I update the values, nothing appears?!

_measuredValues.Add(numBuffer);

One thing I thought about is a data type issue. But how do I change the type just to change it into a string?

lstMeasuredValues.DataSource = _measuredValues.ToString().ToList();

Another reason might be that the upper line of code is within another thread. But I think this should not be the problem.

How can I bind this list?

解决方案

When I update the values, nothing appears?!

_measuredValues.Add(numBuffer);

In order to allow UI to reflect the data source modifications, the data source must provide some sort of a change notification. WinForms list data binding infrastructure uses ListChanged event of the IBindingList Interface. There is a standard provided BindingList<T> class which can be used instead of List<T> to get the desired behavior. All you need is changing this line

List<double> _measuredValues = new List<double>();

to

BindingList<double> _measuredValues = new BindingList<double>();

Another reason might be that the upper line of code is within another thread. But I think this should not be the problem.

That's not good. You must make sure you don't do that because ListChanged event is expected to be raised on the UI thread.

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