using System;
using System.Collections.Generic;
using System.Text;
namespace 服装销售管理系统
{
class UserManagerClass
{
private static string[] user = null;//"huaxiangchun9615102";
private static int user_number ;
static UserManagerClass() //静态构造函数来初始化静态变量
{
user[0] = "huaxiangchun9615102";
user_number = 0;
}
//member function
public static bool addUser(string elem)
{
for (int i = 0; i != user.Length; ++i)
{
if (user[i] == elem)
return false; }
user_number++;
user[user_number - 1] = elem;
return true;
}
public static bool removeUser(string elem)
{
for (int i = 0; i != user.Length; ++i)
{
if (user[i] == elem)
{
for (int j = i; j != user.Length; ++j)
user[j] = user[j + 1];
--user_number;
return true;
}
}
return false;
}
//compare member function
public static bool InvildUser(string elem)
{
for (int i = 0; i != user.Length; ++i)
if (user[i] != elem)
return false;
return true;
}
}
}
我先写了上面这个类.本意是把用户名和密码存在一个字符串中,然后用静态构函预先存一个用户,作为默认用户
再在用户管理窗口调用类的静态方法添加 用户
private void button3_Click(object sender, EventArgs e)
{
string userInfo = textBox1.Text + textBox2.Text;
UserManagerClass.addUser(userInfo);
}
抛出异常不知道是哪里错了?
高人请来指导指导下
using System.Collections.Generic;
using System.Text;
namespace 服装销售管理系统
{
class UserManagerClass
{
private static string[] user = null;//"huaxiangchun9615102";
private static int user_number ;
static UserManagerClass() //静态构造函数来初始化静态变量
{
user[0] = "huaxiangchun9615102";
user_number = 0;
}
//member function
public static bool addUser(string elem)
{
for (int i = 0; i != user.Length; ++i)
{
if (user[i] == elem)
return false; }
user_number++;
user[user_number - 1] = elem;
return true;
}
public static bool removeUser(string elem)
{
for (int i = 0; i != user.Length; ++i)
{
if (user[i] == elem)
{
for (int j = i; j != user.Length; ++j)
user[j] = user[j + 1];
--user_number;
return true;
}
}
return false;
}
//compare member function
public static bool InvildUser(string elem)
{
for (int i = 0; i != user.Length; ++i)
if (user[i] != elem)
return false;
return true;
}
}
}
我先写了上面这个类.本意是把用户名和密码存在一个字符串中,然后用静态构函预先存一个用户,作为默认用户
再在用户管理窗口调用类的静态方法添加 用户
private void button3_Click(object sender, EventArgs e)
{
string userInfo = textBox1.Text + textBox2.Text;
UserManagerClass.addUser(userInfo);
}
抛出异常不知道是哪里错了?
高人请来指导指导下
所以要改为:private static string[] user = new string[10];
2.数组长度一旦创建就固定了,所以这里要创建用户列表不适合用数组。建议private static List<string> user = new List<string>();