未将对象引用设置到对象实例

[liulangdeyuyu]

class LockObject
{
public string lockname="";
public object lockobject=new object();
}


LockObject[] lockobjects;
public LockHelp(DataTable dt)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
lockobjects[i].lockname = dt.Rows[i]["id"].ToString();
}
}

执行到红色部分时抛错

[phil999]

lockobjects 的初始化代码在哪？

[porschev]

lockobjects对象在哪里初始化的？

[porschev]

[Quote=引用 1 楼 phil999 的回复:]
lockobjects 的初始化代码在哪？
[/Quote]


让我情何以堪

[RonaldinYan]

空异常，dt.Rows[i]["id"]这个为空，toString()必然会报错嘛。

[liulangdeyuyu]

LockObject[] lockobjects;
public LockHelp(DataTable dt)
{
lockobjects = new LockObject[dt.Rows.Count];
for (int i = 0; i < dt.Rows.Count; i++)
{
lockobjects[i].Lockname = dt.Rows[i]["id"].ToString();
}
}

改后仍然抛错

[liulangdeyuyu]

[Quote=引用 4 楼 ronaldinyan 的回复:]

空异常，dt.Rows[i]["id"]这个为空，toString()必然会报错嘛。
[/Quote]

检查过dt了，dt没错

[flyerwing]

lockobjects 的初始化代码在哪？

[porschev]

那我在多补点吧。。

一般为出现这种问题

1.XX对象为Null。。。比如viewstate datareader session等等
2.变量未赋值就使用
3.没用初始化对象就使用
4。对控件赋变量值，值又不存在
5、FindControl时找控件时
等等。。。一下只能想这么多了

[无心雨云]

public class LockObject

[gaomeng320]

或者数据库id为大写?

[liulangdeyuyu]

lockobjects 数组怎么初始化？

[sprc_lcl]

  public LockHelp(DataTable dt)
  {
    lockobjects = new LockObject[dt.Rows.Count];
      for (int i = 0; i < dt.Rows.Count; i++)
      {
    lockobjects[i] = new LockObject();
      lockobjects[i].lockname = dt.Rows[i]["id"].ToString();
      }
  }

[无心雨云]

 public class LockObject
  {
  public string lockname="";
  public object lockobject=new object();
  }

[caomin9989]

在同一个单元中不需要加public
改过之后报什么错？

[liulangdeyuyu]

[Quote=引用 12 楼 sprc_lcl 的回复:]

C# code
public LockHelp(DataTable dt)
{
lockobjects = new LockObject[dt.Rows.Count];
for (int i = 0; i < dt.Rows.Count; i++)
{
lockobjects[i] = new LockObject();
lockob……
[/Quote]

已经试过了，抛同样的错

[sprc_lcl]

如果还错就是 id这个字段不存在

[caomin9989]

class LockObject
{
public string lockname ;
public object lockobject;
public LockObject()
{
lockname = "";
lockobject = new object();

}
}


public LockHelp(DataTable dt)
{
lockobjects = new LockObject[dt.Rows.Count];
for (int i = 0; i < dt.Rows.Count; i++)
{
lockobjects[i] = new LockObject();
lockobjects[i].lockname = dt.Rows[i]["id"].ToString();
}
}

[liulangdeyuyu]

解决了，谢谢！

改为struct就好了！