Question

所以我一直在寻找答案，我只是开始使用c＃，所以它可能很简单，但是我有一段代码

private void btnAdd_Click(object sender, EventArgs e)
{
    using (SaveFileDialog sfd = new SaveFileDialog() { Filter = "TextDocuments|*.txt", ValidateNames = true })
    {
        if (sfd.ShowDialog() == DialogResult.OK)
        {

            using (StreamWriter sw = new StreamWriter(sfd.FileName))
            {
                sw.WriteLineAsync(txtMessage.Text);
                MessageBox.Show("Your entry has been saved successfully!", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }
    }       
}

我想知道在此代码中如何将文件名预设为日期？

Answer 1

在保存文件对话框实例上将当前的DateTime分配给DefaultFileName属性

sfd.DefaultFileName=DateTime.Now.ToString();

或

sfd.FileName=DateTime.Now.ToString();

Answer 2

    string logPath = string.Format("{0:yyyy-MM-dd}.txt", DateTime.Now); 
        Console.WriteLine("Path: " + logPath);

            using (StreamWriter file = new StreamWriter(@"./" + logPath, true))
            {
                file.Write(string.Format("{0} {1} {2} {3}", DateTime.Now, log, Environment.NewLine, bankLog));
            }
            Console.WriteLine("Logs inserted to file");

在C＃中将文本文件名写为日期

2 个答案: