asp.net4.5練習〜test3-9

asp.netの空のWebサイト

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //未使用异常处理，页面直接看到错误
        string strConn = @"Data Source=\SQLEXPRESS;Initial Catalog = 'D:\xxx.MDF;'Integrated Security= True";
        System.Data.SqlClient.SqlConnection sql1 = new System.Data.SqlClient.SqlConnection(strConn);
        sql1.Open();
    }
}

例外処理を使用した後

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //使用异常处理后
        string strConn = @"Data Source=\SQLEXPRESS;Initial Catalog='D:\xxx.MDF';Integrated Security=True";
        System.Data.SqlClient.SqlConnection sql2 = new System.Data.SqlClient.SqlConnection(strConn);
        try
        {
            sql2.Open();
        }
        catch (Exception ex)
        {
            Response.Write("系统提示：" + ex.Message + "<br>");
            Response.Write("用户自定义：打开数据库错误！" + "<br>");
        }
        finally
        {
            sql2.Close();
            Response.Write("程序执行至finally了。");
        }
    }
}