将 time/delay 添加到 foreach 中以读取字符串 / Visual Studio 2019 C# Winforms

Add a time/delay into a foreach for reading a string / Visual Studio 2019 C# Win Forms

我想轻松地逐个字母地读取字符串，但是缓慢地，然后将其放入文本框。

private void btn1_Click(object sender, EventArgs e)
{
    string str = "hello world", bar = string.Empty;

    foreach (char c in str)
    {
        bar += c;
        richTextBox1.Text = bar;

        /// delay??
    }
}

将方法转为异步并添加具有所需延迟的 await。

private async void button1_Click(object sender, EventArgs e)
{
    richTextBox1.Text = string.Empty;

    foreach (char c in "hello world")
    {
        richTextBox1.Text += c;
        await Task.Delay(100);
    }
}