[英]DataGridView bound to a Dictionary and updated with a thread
I have a Dictionary bound to DataGridView by using following sample code. 通过使用以下示例代码,我有一个绑定到DataGridView的Dictionary。
DataGridView bound to a Dictionary 绑定到字典的DataGridView
Please see the above question first 请首先查看上述问题
The diffrence is that i am updating dictionary from a thread. 不同之处在于我正在从线程更新字典。 (Event handler of another class). (另一个类的事件处理程序)。
My Event handler is as below 我的事件处理程序如下
static void f_PriceChanged(Objet f, eventData e)
{
if (prices.ContainsKey(e.ItemText))
prices[e.ItemText] = e.price;
else
prices.Add(e.ItemText, e.price);
}
Not to mention the prices is declared as class level. 更不用说价格被宣布为班级。
I have modified the button code from original post as 我已经将原始帖子中的按钮代码修改为
Button btn = new Button();
btn.Dock = DockStyle.Bottom;
btn.Click += delegate
{
bl.Reset();
};
form.Controls.Add(btn);
Internally the Dictionary is updated as expected but grid does not update. 在内部,字典已按预期更新,但网格未更新。 Clicking on button generate exception 点击按钮产生异常
Collection was modified; 集合已修改; enumeration operation may not execute 枚举操作可能无法执行
What to do? 该怎么办?
You have to use a lock statement to protect your shared resource : the dictionary. 您必须使用lock语句来保护共享资源:字典。
private object _lock = new object();
private void Reset()
{
lock(_lock)
{
// your code here
}
}
void f_PriceChanged(Objet f, eventData e)
{
lock(_lock)
{
if (prices.ContainsKey(e.ItemText))
prices[e.ItemText] = e.price;
else
prices.Add(e.ItemText, e.price);
}
}
You'll have to make f_PriceChanged()
a member. 您必须使f_PriceChanged()
成为成员。
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