c#添加了Configuration;后,竟然找不到 ConfigurationManager 这个类,后来才发现:虽然引用了using System.Configuration;这个包,但是还是不行的。
后来终于找到一个解决方法,就是在解决方案资源管理器里找到类文件选择“引用”,然后右击选择“添加引用”,并且从 .net 中找到System.Configuration把它加上去就OK啦
实例:DataGridView显示数据using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using DevExpress.XtraEditors; using System.Data.SqlClient; using System.Configuration;namespace WindowsApplication1 {public partial class XtraForm1 : DevExpress.XtraEditors.XtraForm{public XtraForm1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){string customers = "select * from Customers";using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["northwind"].ConnectionString)){DataSet dt = new DataSet();SqlDataAdapter da = new SqlDataAdapter(customers, con);da.Fill(dt, "Customers");dataGridView1.AutoGenerateColumns = true;dataGridView1.DataSource = dt;dataGridView1.DataMember = "Customers";}}} }