摘要：
private void button2_Click(object sender, EventArgs e) { DataTable dt = new DataTable(); dt.Columns.Add("AAA", typeof(string));//0 dt.Columns.Add("BBB 阅读全文
摘要：
private void button2_Click(object sender, EventArgs e) { double a = 0; List<string> list = new List<string>(); for (int i = 0; i < 100; i++) { a += 0. 阅读全文