public void gengxinsql()
{
Console.WriteLine("请输入编号");
int bianhao = int.Parse(Console.ReadLine());
string sql = GetSql1(bianhao);
int i = panduan(sql);
if (i > 0)
{
Console.WriteLine("请输入新的在线天数");
double day = double.Parse(Console.ReadLine());
string sql1 = getsql2(day, bianhao);
int j = panduan1(sql1);
if (j>0)
{
Console.WriteLine("修改成功");
}
else
{
Console.WriteLine("修改失败");
}
}
else
{
Console.WriteLine("无编号记录");
}
}

private int panduan1(string sql1)
{
int j = -1;
try
{
DB.conn.Open();
SqlCommand comm = new SqlCommand(sql1, DB.conn);
j = (int)comm.ExecuteScalar();
}
catch (Exception ex)
{
Console.WriteLine("数据库链接失败"+ex.Message);// 这行就是
未将对象引用设置到对象的实例
}
finally
{
DB.conn.Close();
}
return j;
}

private string getsql2(double day,int bianhao)
{
string sql1 = string.Format("update QQInfo set day={0} where QQID={1}",day,bianhao);
return sql1;
}
private int panduan(string sql)
{
int i=-1;
SqlCommand comm=new SqlCommand(sql,DB.conn);
try
{
DB.conn.Open();
i = (int)comm.ExecuteScalar();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
DB.conn.Close();
}
return i;
}
private string GetSql1(int bianhao)
{
string sql = string.Format("select COUNT(*) from QQInfo where QQID={0}",bianhao);
return sql;
}

以上全部代码求指点呀，什么是未将对象引用设置到对象的实例
万能的WOWER

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