UC知道一个关于c#.net返回值的问题
来源：百度知道 编辑：UC知道 时间：2024/05/10 20:56:16
各位大虾帮帮忙啦~~
我在vs.net2005中写了以下一段代码:
public string SelectRole(string NO,string CardID,string Role)
{
if(Role=="学生")
{
string sql="select count(*) from student where SID='"+NO+"' and SCardID='"+CardID+"'";
return sql;
}
else
{
string sql="select count(*) from Teacher where TID='"+NO+"' and TCardID='"+CardID+"'";
return sql;
}
}
出现错误提示如下:
并非所有的确代码路径都返回值!
怎么改呀~不会呀~偶系菜乌别骂偶~~
我在vs.net2005中写了以下一段代码:
public string SelectRole(string NO,string CardID,string Role)
{
if(Role=="学生")
{
string sql="select count(*) from student where SID='"+NO+"' and SCardID='"+CardID+"'";
return sql;
}
else
{
string sql="select count(*) from Teacher where TID='"+NO+"' and TCardID='"+CardID+"'";
return sql;
}
}
出现错误提示如下:
并非所有的确代码路径都返回值!
怎么改呀~不会呀~偶系菜乌别骂偶~~
改成：
public string SelectRole(string NO,string CardID,string Role)
{
string result="";
if(Role=="学生")
{
result="select count(*) from student where SID='"+NO+"' and SCardID='"+CardID+"'";
}
else
{
result="select count(*) from Teacher where TID='"+NO+"' and TCardID='"+CardID+"'";
}
return result;
}
public string SelectRole(string NO,string CardID,string Role)
{
if(Role=="学生")
{
string sql="select count(*) from student where SID='"+NO+"' and SCardID='"+CardID+"'";
return sql;
}
string sql="select count(*) from Teacher where TID='"+NO+"' and TCardID='"+CardID+"'";
return sql;
}
看看这样行不？