如何删除特定文本/消息在ListView显示？ [英] how to delete a specific text / message showed in a ListView ?

问题描述

嘿！

我会试着解释我的问题更好地在这里和我的情况：）

i will try to explain my question better here and my situation :)

我有一个的ListView 我的应用程序，这的ListView 用于输出错误，所以它有点用错误日志。

i have a ListView in my application, this ListView is used for output errors , so its kinda used for error log.

我的方案主要是一个定时器，即检查在INT值的变化。

My program is mainly a timer, that is checking for changes in int values.

。
问题是，该错误将然后像3-4次，也许更多加入。

when an error occurs I want to show it in my list. Problem is that the error will then be added like 3-4 times, maybe more.

我如果做一个检查，如果（exist.in.listbox）我将无法添加相同的错误第二次。我想要做的就是删除特定的消息/错误，然后将其删除时，其固定或不再对系统构成威胁。
这里是code片断：

If i do a check if(exist.in.listbox) i will not be able to add the same error second time. What I want to do is to delete specific message/error and then delete it when its "fixed" or no longer a threat to the system. here is code snippet:

                if (Convert.ToInt32(x) == 1 && Convert.ToInt32(y) == 1)
                {

                    found = false;
                    ListViewItem item = new ListViewItem(message);
                    foreach (ListViewItem z in listView1.Items)
                    {
                        if (z.Text == message)
                        { found = true; }
                    }

                    if (found == false)
                    {
                        item.SubItems.Add(now.ToString());
                        listView1.Items.Add(item);
                        listView1.EnsureVisible(item.Index);
                    }
                }
                else
                {
                    foreach (ListViewItem z in listView1.Items)
                    {
                        if (z.Text == message)
                        {
                           //no longer a threat, delete the message added aboue
                        }
                    }
                }

找不到这事。只有当选择 - >删除行

cant find anything about this. only "when selected --> delete the line"

可以考虑一下这款像视觉误差窗口中，当u得到一个红色的错误，U可以修复code.and它disapair：）

can think about this like the error window in visual, when u get a red error, u can fix the code.and it disapair :)

推荐答案

您应该遵循同样的方法添加内容时为。首先，检查如果要执行删除，然后删除该项目。

You should follow the same approach as when you add items. First, check if you want to perform the deletion, and then remove the item.

如果这个效果并不是很好（通过列表中的每个定时器循环迭代两次），你也可以将您的添加/删除的逻辑出的ListView（即可能保持更快的查找字典）。

If this does not perform well (iterating through the list twice on each timer iteration), you could also move your "add/remove" logic out of the ListView (ie, maybe keep a Dictionary for faster lookup).

void DeleteIfNecessary(string message)
{
    ListViewItem listViewItem = FindListViewItemForMessage(message);
    if (listViewItem == null)
    {
        // item doesn't exist
        return;
    }

    this.listView1.Items.Remove(listViewItem);
}

private ListViewItem FindListViewItemForMessage(string s)
{
    foreach (ListViewItem lvi in this.listView1.Items)
    {
        if (StringComparer.OrdinalIgnoreCase.Compare(lvi.Text, s) == 0)
        {
            return lvi;
        }
    }

    return null;
}

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