c#参数超出范围未处理，原因是SelectedIndex

本文关键字：SelectedIndex 未处理 参数 范围 | 更新日期: 2023-09-27 18:16:48

由于没有编号或没有选择连接的客户端索引编号而单击按钮时发生'Argument out of range was unhandled'错误。错误提示:

workerSocket = (Socket)m_workerSocketList[comboBox1.SelectedIndex];

我想给一个消息框说'请选择一个正确的数字'。应该编写什么代码来处理这个错误?

下面是代码: 
void indmsgbtn_Click(object sender, EventArgs e)
{
    string msg = richtxtindmsg.Text;
    msg = "Private Admin Message: " + msg + "'n";
    byte[] byData = System.Text.Encoding.ASCII.GetBytes(msg);
    Socket workerSocket = null;
    // for (int i = 0; i < m_workerSocketList.Count; i++)
    workerSocket = (Socket)m_workerSocketList[comboBox1.SelectedIndex];
    if (workerSocket != null)
    {
        if (workerSocket.Connected)
        {
            workerSocket.Send(byData);
        }
    }       
}

c#参数超出范围未处理，原因是SelectedIndex

在调用workerSocket = (Socket)m_workerSocketList[comboBox1.SelectedIndex];之前，需要检查comboBox1.SelectedIndex的值。如果超出范围，则显示错误消息;只有当它在范围(>= 0和< m_workerSocketList.Count)中，才可以安全地用作m_workerSocketList的索引。

你可以试试:

if (comboBox1.SelectedIndex > -1 && comboBox1.SelectedIndex < m_workerSocketList.Count)
{
    workerSocket = (Socket)m_workerSocketList[comboBox1.SelectedIndex];
}
else
{
    //message
}
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