Question

ASP（C#）LISTBOX选中项怎么删不了

protected void Button3_Click(object sender, EventArgs e) { string t = ""; if (this.ListBox1.SelectedItem != null) { t = ListBox1.SelectedValue; } SqlConnection con = new SqlConnection(ConnStr); string delet = "DELETE Ma2 WHERE Ma2 = '" + t + "'"; SqlCommand com = new SqlCommand(delet, con); con.Open(); com.ExecuteNonQuery(); con.Close(); Response.AddHeader("Refresh", "0"); } 请帮我看下上面的代码问题出在哪，怎么变量T一直都是空值，即使已经选中一个选项的时候。

Answer 1

this.ListBox1.SelectedItem 换成this.ListBox1.SelectedValue，试过吗？