Question

我正在实施ping测试，以查看远程计算机是否在线。我有一个文本框，您可以将计算机IP放入其中，然后按下一个按钮，按下该按钮可以ping所有计算机以查看它们是否在线。我想更改线条的颜色以反映在线或离线（绿色或红色）。如果失败，我当前的代码会将整个文本框颜色更改为红色。

我的目标是，如果其中一台计算机未通过ping测试，它将显示为红色，而其他计算机如果收到ping回来则会保持绿色。

感谢。

private void button_Click(object sender, EventArgs e)
    {
        var sb = new StringBuilder();
        foreach (var line in txtcomputers.Lines)
        {

            string strhost = line;
            if (strhost.Length > 0)
            {
                Ping pingSender = new Ping();
                PingOptions options = new PingOptions();
                options.DontFragment = true;
                // Create a buffer of 32 bytes of data to be transmitted.  
                string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
                byte[] buffer = Encoding.ASCII.GetBytes(data);
                int timeout = 120;
                try
                {
                    PingReply reply = pingSender.Send(strhost, timeout, buffer, options);
                    if (reply.Status == IPStatus.Success)
                    {

                        txtcomputers.ForeColor = Color.Green;

                    }
                    else
                    {
                        txtcomputers.ForeColor = Color.Red;
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
            }
        }
    }

Answer 1

在Jon建议使用RichTextBox时，您需要使用SelectionStart，SelectionLength，SelectionColor和GetFirstCharIndexFromLine来获取每行的起始字符索引。看看这是否适合你。

private void button_Click(object sender, EventArgs e)
{
    var sb = new StringBuilder();
    Color originalColor = txtcomputers.SelectionColor; ;

    for (int i = 0; i < txtcomputers.Lines.Count(); i++)
    {
        var line = txtcomputers.Lines[i];
        string strhost = line;
        if (strhost.Length > 0)
        {
            Ping pingSender = new Ping();
            PingOptions options = new PingOptions();
            options.DontFragment = true;
            // Create a buffer of 32 bytes of data to be transmitted.   
            string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
            byte[] buffer = Encoding.ASCII.GetBytes(data);
            int timeout = 120;
            try
            {
                PingReply reply = pingSender.Send(strhost, timeout, buffer, options);
                txtcomputers.SelectionStart = txtcomputers.GetFirstCharIndexFromLine(i);
                txtcomputers.SelectionLength = strhost.Length;

                if (reply.Status == IPStatus.Success)
                {
                    txtcomputers.SelectionColor = Color.Green;
                }
                else
                {
                    txtcomputers.SelectionColor = Color.Red;
                }


            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            txtcomputers.SelectionLength = 0;
        }
    }
    txtcomputers.SelectionColor = originalColor;
}

Answer 2

我认为TextBox不能有多种颜色的文字。（至少在Windows窗体中。您尚未指定GUI正在使用的平台。）

你应该看看RichTextBox，而确实允许这样做。

c＃使用字符串生成器更改文本框行的颜色

2 个答案: