使用文本框和按钮在列表框中搜索项目 [英] Searching for an item within a ListBox using a TextBox and a Button

问题描述

我正在创建一个系统，其中包含用户插入的整数 ListBox.我已经包含一个搜索按钮和一个搜索TextBox，供用户在ListBox 中输入他们想要搜索的整数.一旦用户输入了整数，我希望显示一个消息框，通知用户有例如列表框中值为 '3' 的 1 个整数，或通知用户该整数不存在于列表框中的错误消息框.

I am creating a system that includes a ListBox of integers inserted by the user. I have contained a search button and a search TextBox for the user to input the integer they want to search for within the ListBox. Once the user has inputted the integer, I want a message box to be displayed either informing the user that there is e.g. 1 integer of value '3' in the list box, or an error message box informing the user that the integer does not exist within the list box.

private void buttonSearch_Click(object sender, EventArgs e)
{
    listBoxAddedIntegers.SelectedItems.Clear();
    for (int i = listBoxAddedIntegers.Items.Count - 1;i>=0; i--) ;
    {
        if (listBoxAddedIntegers.Items[i].ToString().ToLower().Contains(textBoxSearch.Text.ToLower())) ;
        {
            listBoxAddedIntegers.SetSelected(i, true);
        }
    }

    // ...
}

我不确定要包含在此处的代码，并且我已经插入的代码表明当前内容中不存在i".

I am not really sure on the code that I am meant to include here, and the code that I have already inserted suggests that 'i' does not exist in the current content.

有人可以帮忙吗?

推荐答案

private void buttonSearch_Click(object sender, EventArgs e)
    {
        listBoxAddedIntegers.SelectedItems.Clear();

        var itemsFound = listBoxAddedIntegers.Items.Where(i=>i.ToString().ToLower().Contains(textBoxSearch.Text.ToLower())).ToList();

        if(itemsFound == null)
        {
            MessageBox.Show("No matches found.");
        }
        else
        {
            MessageBox.Show("Found " + itemsFound.Count + " matches.");
        }

    }

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