将项目从一个列表框转移到另一个列表框 [英] transfer items from one listbox to another

问题描述

到目前为止，我已经完成了将单个选择项从lb1转移到lb2的工作，反之亦然.现在的问题是将整个数据列表从lb1传输到lb2，反之亦然.如果有人可以帮助的话. 使用for循环会更好.

我正在使用以下代码:

    private void add_Click(object sender, EventArgs e)
    {
        if (lb1.SelectedItem != null)
        {
            lb2.Items.Add(lb1.SelectedItem);
            lb1.Items.Remove(lb1.SelectedItem);
        }
        else
        {
            MessageBox.Show("No item selected");
        }
    }

    private void remove_Click(object sender, EventArgs e)
    {
        if (lb2.SelectedItem != null)
        {
            lb1.Items.Add(lb2.SelectedItem);
            lb2.Items.Remove(lb2.SelectedItem);
        }
        else
        {
            MessageBox.Show("No item selected");
        }
    }

    private void addall_Click(object sender, EventArgs e) //problem is here. adding all the items from lb1 to lb2
    {
        for (int i = 0; i < lb1.SelectedItems.Count; i++)
        {
            lB2.Items.Add(lb1.SelectedItems[i].ToString());
        }
    }

    private void removeall_Click(object sender, EventArgs e) //problem is here. adding all the items from lb2 to lb1
    {

    }

解决方案

因为您要将所有所有项从一个列表框转移到另一个列表框中，不仅您必须为每个项目循环在列表框中，而不仅仅是选定的项目.

因此，将ListBox.SelectedItems的用法更改为ListBox.Items，假设您还记得也删除了这些项目，则代码应该可以按预期工作.

for (int i = 0; i < lb1.Items.Count; i++)
{
    lB2.Items.Add(lb1.Items[i].ToString());
}
lb1.Items.Clear();

so far i have accomplished transfer a single select item from one lb1 to lb2 and vice versa. Now the problem is transfering the whole list of data from lb1 to lb2 and vice versa. if anyone could help please. using for loop will be much better.

i am using the following code:

    private void add_Click(object sender, EventArgs e)
    {
        if (lb1.SelectedItem != null)
        {
            lb2.Items.Add(lb1.SelectedItem);
            lb1.Items.Remove(lb1.SelectedItem);
        }
        else
        {
            MessageBox.Show("No item selected");
        }
    }

    private void remove_Click(object sender, EventArgs e)
    {
        if (lb2.SelectedItem != null)
        {
            lb1.Items.Add(lb2.SelectedItem);
            lb2.Items.Remove(lb2.SelectedItem);
        }
        else
        {
            MessageBox.Show("No item selected");
        }
    }

    private void addall_Click(object sender, EventArgs e) //problem is here. adding all the items from lb1 to lb2
    {
        for (int i = 0; i < lb1.SelectedItems.Count; i++)
        {
            lB2.Items.Add(lb1.SelectedItems[i].ToString());
        }
    }

    private void removeall_Click(object sender, EventArgs e) //problem is here. adding all the items from lb2 to lb1
    {

    }

解决方案

Because you want to transfer all of the items from one list box to another not only the selected items you must loop for every item in the list box and not only the selected items.

So change your usage of ListBox.SelectedItems to ListBox.Items and your code should work as expected assuming you remember to remove the items as well.

for (int i = 0; i < lb1.Items.Count; i++)
{
    lB2.Items.Add(lb1.Items[i].ToString());
}
lb1.Items.Clear();

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