异常"未将对象引用设置到对象的实例",怎么办?

[junes8250]

有个函数如下:
private string GetUrlFromReg()
{
StringBuilder sb=new StringBuilder("tcp://");
try
{
RegistryKey regRead=Registry.LocalMachine.OpenSubKey ("Software\\RemoteListClient",true);
Object obj=regRead.GetValue("serverip");
sb.Append(obj.ToString());
obj=regRead.GetValue("channel");
sb.Append(":"+obj.ToString()+"/RemoteServices");
regRead.Close();
}
catch(Exception e)
{
MessageBox.Show(e.Message);
}
return sb.ToString();
}
当我在Main()函数里调用它时,却抛出"未将对象引用设置到对象的实例"错误,
应该怎么办?

[junes8250]

rt:
using System;
using Microsoft.Win32;
using System.Text;

namespace ConsoleApplication
{
/// <summary>
/// Class1 的摘要说明。
/// </summary>
class Class1
{
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main(string[] args)
{
string str=new Class1().GetUrlFromReg();
Console.WriteLine(str);
Console.ReadLine();
}

public string GetUrlFromReg()
{
StringBuilder sb=new StringBuilder("tcp://");

try
{
RegistryKey regRead=Registry.LocalMachine.OpenSubKey("Software\\RemoteListClient",true);
Object obj=regRead.GetValue("serverip");
sb.Append(obj.ToString());
obj=regRead.GetValue("channel");
sb.Append(":"+obj.ToString()+"/RemoteServices");
regRead.Close();
}
catch(Exception e)
{
Console.WriteLine(e.Message);
}

return sb.ToString();
}
}
}

[chenghaofeng]

不能这样调用共有成员；
应该是：Class1 tmp = new Class1();
string str = tmp.GetUrlFromReg();

[istring]

sb.Append(obj.ToString());=====>>>>>sb.Append(obj);

[Jackile]

把Main函数体贴一下，我帮你看！


估计是变量无初始化值，或者引用类时没有实例化！