除了其他响应者所说的之外，我将使用StringBuilder来组合字符串.将大量字符串组合在一起时，通常***使用StringBuilder.另外，我将使用object.ReferenceEquals来比较两个对象，而不是使用默认的inequality运算符.

另外，我知道您不要求在每个逗号后插入换行符，因此您可以将其从响应者提供给您的代码中删除.但是，如果您确实想插入换行符，则可以使用Environment.NewLine而不是"\ r \ n".

创建StringBuilder后，调用ToString并将结果分配给您正在使用的TextBox的Text属性.

In addition to what the other responder said, I''d use a StringBuilder to combine the strings. It''s generally a good idea to use a StringBuilder when combining a significant number of strings together. Also, instead of using the default inequality operator, I''d use object.ReferenceEquals to compare the two objects.

Also, I know you didn''t ask for a newline to be inserted after each comma, so you can take that out of the code the responder gave you. But if you do want to insert a newline, I''d use Environment.NewLine rather than "\r\n".

Once you are done creating the StringBuilder, call ToString and assign the result to the Text property of the TextBox you are using.

如果您知道如何处理列表框中的多行，只需将这些值一起添加到字符串中，然后将字符串的值分配给文本框，或直接分配给文本框.

If you know how to process multiple lines out of a list box, simply append the values together either into a string, then assign the value of the string to the text box, or directly into the text box.

好吧，我的解决方案是:

考虑我们在窗体上有一个列表框，其"SelectionMode"属性设置为值"MultiSimple"，以及一个文本框，其"Multiline"属性为true，而"WordWrap"属性为false.当然还有一个按钮，用于将列表框中的项目添加到文本框中.

我在"button1_Click"事件中的代码为:

private void button1_Click(对象发送者，EventArgs e)
{
int count = listBox1.SelectedItems.Count;

foreach(listBox1.SelectedItems中的对象项)
{
textBox1.Text + = item.ToString();

如果(listBox1.SelectedItems [count-1]！= item)
textBox1.Text + =，\ r \ n";
}
}

因此，列表框中的每个选定项都将添加(通过ToString()函数作为字符串)到文本框的文本中，如果不是最后一个选定项，则将添加逗号和新行.

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问候

H.Maadani

Well, my solution for that would be :

consider we have a listbox on form, with its ''SelectionMode'' property set to value ''MultiSimple'', and a textbox which ''Multiline'' property is true, and ''WordWrap'' property is false. and of course a button to add items from listbox to textbox.

my code in the ''button1_Click'' event would be :

private void button1_Click(object sender, EventArgs e)
{
int count = listBox1.SelectedItems.Count;

foreach (object item in listBox1.SelectedItems)
{
textBox1.Text += item.ToString();

if (listBox1.SelectedItems[count - 1] != item)
textBox1.Text += ", \r\n";
}
}

So, each selected item in listbox will be added ( as an string via ToString() function) to textbox''s text, and if it isnt the last selected item, a comma and a new line will be added.

------------------------
Regards

H.Maadani