Datagridview无法正确更新 [英] Datagridview not updating correctly

问题描述

我是C＃的新手，正在尝试将一个对象列表输入到datagridview中。每次单击按钮时，我都会不断向该列表中添加项目，并且datagridview应该通过将其数据源设置回列表来刷新。

I'm new-ish to C# and I'm trying to input a list of objects into a datagridview. I constantly add items to this list each time I click a button and the datagridview should refresh by setting it's data source back to the list.

这是列表：

List<Models.OrderItem> orderitemlist = new List<Models.OrderItem>();

这是添加到列表并刷新列表的代码：

And here is the code that adds to the list and refreshes the list:

 private void btnAddToOrder_Click(object sender, EventArgs e)
    {
        int quantity = Convert.ToInt32(tbAddOrderQuantity.Text);
        int stock = Convert.ToInt32(ItemDataGrid.CurrentRow.Cells[6].Value);
        int newstock = stock - quantity;

        if (newstock < 0)
            MessageBox.Show("You do not have enough items in stock for this.");
        else
        {
            ItemDataGrid.CurrentRow.Cells[6].Value = newstock;

            int itemID = Convert.ToInt32(ItemDataGrid.CurrentRow.Cells[0].Value);
            string itemname = Convert.ToString(ItemDataGrid.CurrentRow.Cells[1].Value);
            int sellprice = Convert.ToInt32(ItemDataGrid.CurrentRow.Cells[5].Value);

            Models.OrderItem item = new Models.OrderItem(itemID, itemname, sellprice, quantity);
            orderitemlist.Add(item);
            RefreshItemsOnOrderData();
            RefreshPrice();
        }
    }

    private void RefreshItemsOnOrderData()
    {
        ItemOnOrderDataGrid.DataSource = orderitemlist;
    }

该列表将与第一个项目一起更新，但是当我尝试添加另一个项目时它似乎在运行代码块，但是实际上并没有将其添加到datagrid视图中。有人能帮忙吗？我犯了一个我看不到的简单错误吗？

The list will update with the first item however when I try to add another item it seems to run the block of code however doesn't actually add it to the datagrid view. Is anyone able to help? Have I made a simple error I just can't see?

推荐答案

如上所述，

将源设置为null，重新引用列表，然后重置绑定

Set the source to null, re-ref the list, then reset bindings

        ItemOnOrderDataGrid.DataSource = null;
        ItemOnOrderDataGrid.DataSource = orderitemlist;
        ItemOnOrderDataGrid.ResetBindings();

您可能想尝试省略null。我不记得这是否可以不使用null。

You may want to try omitting the null. I can't recall if this works without the null.

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